-
Ab initio Study on Lithium Anode Interface Instability and Stabilization of Superionic Li3InCl6 and Li6PS5Cl Solid Electrolytes
Authors:
Cheng-Man Wang,
Chao-Hsiang Hsu,
Jing-Sen Yang,
Ping-Chun Tsai
Abstract:
Emerging superionic conductors Li3InCl6 (LIC) and Li6PS5Cl (LPSC) are very promising for solid-state electrolytes (SSEs) in all-solid-state lithium batteries (ASSLBs). However, unstable lithium-anode interfaces in LIC and LPSC have been observed through experiments and ab initio calculations, while the interphases formed in determining interfacial stability remain unclear. In this study, we invest…
▽ More
Emerging superionic conductors Li3InCl6 (LIC) and Li6PS5Cl (LPSC) are very promising for solid-state electrolytes (SSEs) in all-solid-state lithium batteries (ASSLBs). However, unstable lithium-anode interfaces in LIC and LPSC have been observed through experiments and ab initio calculations, while the interphases formed in determining interfacial stability remain unclear. In this study, we investigate the ab initio stability of LIC-Li and LPSC-Li interfaces and interphases. Our ab initio calculations revealed that both interfaces are not chemically or electrochemically thermodynamically stable. Interestingly, the LPSC-Li has a stable interphase, but the LIC-Li doesn't. Moreover, the interlayers were systematically evaluated for the LIC-Li and LPSC-Li interfaces, and the desired interlayer materials are clarified for the two interfaces. This ab initio understanding of the interfaces, interphases and interlayers would help the development of a variety of stable interfaces in ASSLBs.
△ Less
Submitted 3 December, 2024;
originally announced December 2024.
-
Sustained Robust Exciton Emission in Suspended Monolayer WSe_2 within the Low Carrier Density Regime for Quantum Emitter Applications
Authors:
Zheng-Zhe Chen,
Chiao-Yun Chang,
Ya-Ting Tsai,
Po-Cheng Tsai,
Shih-Yen Lin,
Min-Hsiung Shih
Abstract:
The development of semiconductor optoelectronic devices is moving toward low power consumption and miniaturization, especially for high-efficiency quantum emitters. However, most of these quantum sources work at low carrier density region, where the Shockley-Read-Hall recombination may dominant and seriously reduce the emission efficiency. In order to diminish the affection of carrier trapping and…
▽ More
The development of semiconductor optoelectronic devices is moving toward low power consumption and miniaturization, especially for high-efficiency quantum emitters. However, most of these quantum sources work at low carrier density region, where the Shockley-Read-Hall recombination may dominant and seriously reduce the emission efficiency. In order to diminish the affection of carrier trapping and sustain a strong photoluminescence emission under low power pumping condition, we investigated on the influence of Suspending to monolayered tungsten diselenide, novel two-dimensional quantum material. Not only the PL intensity, but also the fundamental photoluminescence quantum yield has exhibited a huge, order-scale enhancement through suspending, even surprisingly, we found the PLQY improvement revealed far significantly under small pumping power and came out an exponential increase tendency toward even lower carrier density region. With its strong excitonic effect, suspended WSe_2 offers a solution to reduce carrier trapping and participate in non-radiative processes. Moreover, in the low-power range where SRH recombination dominates, suspended WSe_2 exhibited remarkably higher percentage of excitonic radiation compared to contacted WSe_2. Herein, we quantitatively demonstrate the significance of suspended WSe_2 monolayer at low carrier density region, highlighting its potential for developing compact, low-power quantum emitters in the future.
△ Less
Submitted 27 February, 2024;
originally announced February 2024.
-
Liquid Droplet as Adaptive Material while Levitating via Coupling between Plasma and Kelvin Force
Authors:
Ping-Rui Tsai,
Hong-Yue Huang,
Ying-Pin Tsai,
Chih-Jung Lin,
Bo-Kai Xu,
Jih-Kang Hsieh,
Yu-Ting Cheng,
Cheng-Wei Lai,
Yu Hsuan Kao,
Wen-Chi Chen,
Fu-Li Hsiao,
Yu-Jane Sheng,
Po-Heng Lin,
Tzay-Ming Hong
Abstract:
Fascinating in art and science, the ability to float is also captivating and relevant in practical applications, such as Penning and ion traps that are fundamental to quantum computing. In this work, we first reproduce the classic water bridge by glycerol and, as it breaks down due to thermal agitation, observe that a lump of glycerol with mass~2.5 g can float and exhibit near-periodic oscillation…
▽ More
Fascinating in art and science, the ability to float is also captivating and relevant in practical applications, such as Penning and ion traps that are fundamental to quantum computing. In this work, we first reproduce the classic water bridge by glycerol and, as it breaks down due to thermal agitation, observe that a lump of glycerol with mass~2.5 g can float and exhibit near-periodic oscillations. Through experiments, finite element analysis, and simulations, we discover that the stability of the floating droplet is made possible by the interaction between three mechanisms: Deformation, Plasma, and Kelvin force. Note that glycerol cluster (GC) falls in the class of adaptive materials that can change their properties or behavior in response to varying environmental conditions, i.e., stimuli-responsive. Furthermore, the stimuli, modified by the deformation of GC, collaborate with it to create this unique simple, yet stable, floating system. Backed up by simulations, this process, operated by only a single pair of electrodes, holds the potential to develop a simple yet powerful railgun.
△ Less
Submitted 26 July, 2025; v1 submitted 3 July, 2023;
originally announced July 2023.
-
Viscous Fingering Instability of Complex Fluids in a Tapered Geometry
Authors:
Alban Pouplard,
Peichun Amy Tsai
Abstract:
Viscous fingering (VF) is an interfacial instability that occurs in a narrow confinement or porous medium when a less-viscous fluid pushes a more viscous one, producing finger-like patterns. Controlling the VF instability is essential to enhance the efficiency of various technological applications. However, the control of VF instability has been challenging and so far focused on simple Newtonian f…
▽ More
Viscous fingering (VF) is an interfacial instability that occurs in a narrow confinement or porous medium when a less-viscous fluid pushes a more viscous one, producing finger-like patterns. Controlling the VF instability is essential to enhance the efficiency of various technological applications. However, the control of VF instability has been challenging and so far focused on simple Newtonian fluids of constant viscosity. Here, we extend to complex yield-stress fluids and examine the controlling feasibility by carrying out a linear stability analysis using a radial cell with a converging gap gradient. We avoid making the major assumption of a small Bingham number, Bn << 1, i.e., a negligible ratio of the yield to shear stress, and instead provide a new stability criterion predicting apparent complex VF. This criterion depends on not only the complex fluid's rheology, interfacial tension, and contact angle to the wetting wall, but also the gap gradient, the radius, gap-thickness, and velocity at the fluid-fluid interface. Finally, we compare this theoretical criterion to our experimental data with nitrogen pushing a complex yield-stress fluid in a taper and find good agreement.
△ Less
Submitted 16 May, 2022;
originally announced May 2022.
-
Qubit-efficient encoding scheme for quantum simulations of electronic structure
Authors:
Yu Shee,
Pei-Kai Tsai,
Cheng-Lin Hong,
Hao-Chung Cheng,
Hsi-Sheng Goan
Abstract:
Simulating electronic structure on a quantum computer requires encoding of fermionic systems onto qubits. Common encoding methods transform a fermionic system of $N$ spin-orbitals into an $N$-qubit system, but many of the fermionic configurations do not respect the required conditions and symmetries of the system so the qubit Hilbert space in this case may have unphysical states and thus can not b…
▽ More
Simulating electronic structure on a quantum computer requires encoding of fermionic systems onto qubits. Common encoding methods transform a fermionic system of $N$ spin-orbitals into an $N$-qubit system, but many of the fermionic configurations do not respect the required conditions and symmetries of the system so the qubit Hilbert space in this case may have unphysical states and thus can not be fully utilized. We propose a generalized qubit-efficient encoding (QEE) scheme that requires the qubit number to be only logarithmic in the number of configurations that satisfy the required conditions and symmetries. For the case of considering only the particle-conserving and singlet configurations, we reduce the qubit count to an upper bound of $\mathcal O(m\log_2N)$, where $m$ is the number of particles. This QEE scheme is demonstrated on an H$_2$ molecule in the 6-31G basis set and a LiH molecule in the STO-3G basis set using fewer qubits than the common encoding methods. We calculate the ground-state energy surfaces using a variational quantum eigensolver algorithm with a hardware-efficient ansatz circuit. We choose to use a hardware-efficient ansatz since most of the Hilbert space in our scheme is spanned by desired configurations so a heuristic search for an eigenstate is sensible. The simulations are performed on IBM Quantum machines and the Qiskit simulator with a noise model implemented from a IBM Quantum machine. Using the methods of measurement error mitigation and error-free linear extrapolation, we demonstrate that most of the distributions of the extrapolated energies using our QEE scheme agree with the exact results obtained by Hamiltonian diagonalization in the given basis sets within chemical accuracy. Our proposed scheme and results show the feasibility of quantum simulations for larger molecular systems in the noisy intermediate-scale quantum (NISQ) era.
△ Less
Submitted 25 May, 2022; v1 submitted 8 October, 2021;
originally announced October 2021.
-
Multiphase CO2 Dispersions in Microfluidics: Formation, Phases, and Mass Transfer
Authors:
Tsai-Hsing Martin Ho,
Dan Sameoto,
Peichun Amy Tsai
Abstract:
The dissolution and microfluidic mass transfer of carbon dioxide in water at high-pressure conditions are crucial for a myriad of technological applications, including microreactors, extractions, and carbon capture, utilization, and sequestration (CCUS) processes. In this experimental work, we use a high-pressure microfluidic method to elucidate the mass transfer process of CO2 in water at high pr…
▽ More
The dissolution and microfluidic mass transfer of carbon dioxide in water at high-pressure conditions are crucial for a myriad of technological applications, including microreactors, extractions, and carbon capture, utilization, and sequestration (CCUS) processes. In this experimental work, we use a high-pressure microfluidic method to elucidate the mass transfer process of CO2 in water at high pressure. An intriguing multiphase CO2 flow and dispersions are observed when operating at the pressure-temperature ($P$-$T$) condition close to the CO2 gas-liquid phase boundary ($P=6.5$ MPa and $T=23.5\pm 0.5~^{\circ}$C). We propose a series of strategies to unravel this complex multi-phase dynamics by calculating each phase's volume and mass change in a gas-liquid coexistent CO2 dispersion, estimating the possible CO2 concentration change in water, and comparing with the CO2 solubility data. Finally, we quantify the CO2 mass transfer by directly calculating the CO2 dissolution rate in water and estimating the volumetric mass transfer coefficient ($k_{L}a$). The results show that the mass transfer may be influenced by the specific area ($a$), CO2 concentration gradient in the water slug, and the traveling speed of a dispersion.
△ Less
Submitted 16 July, 2021;
originally announced July 2021.
-
Evidence for spontaneous arrangement of two-way flow in water bridge via particle image velocimetry
Authors:
Ping-Rui Tsai,
Hong-Yue Huang,
Cheng-Wei Lai,
Yu-Ting Cheng,
Chih-Yung Huang,
Cheng-En Tsai,
Yi-Chun Lee,
Hong Hao,
Tzay-Ming Hong
Abstract:
By revisiting the century-old problem of water bridge, we demonstrate that it is in fact dynamic and comprises of two coaxial water currents that carry different charges and flow in opposite directions. This spontaneous separation is triggered by the different stages to construct the water bridge. Initially, a flow is facilitated by the cone jet that is powered by H+ and flows out of the positive-…
▽ More
By revisiting the century-old problem of water bridge, we demonstrate that it is in fact dynamic and comprises of two coaxial water currents that carry different charges and flow in opposite directions. This spontaneous separation is triggered by the different stages to construct the water bridge. Initially, a flow is facilitated by the cone jet that is powered by H+ and flows out of the positive-electrode beaker. An opposing cone-jet from negative beaker is established later and forced to take the outer route. This spontaneous arrangement of two-way flow is revealed by using fluorescein and carbon powder as tracers, and the Particle Image Velocimetry, These two opposing flows are found to carry non-equal flux that results in a net transport of water to the negative beaker. We manage to estimate the flow speed and cross-sectional area of these co-axial flows as a function of time and applied voltage. Note that the water on the outer layer functions as a millimeter tube that confines and interacts strongly with the flow inside. This provides a first natural and yet counter example to the recently reported near-frictionless flow in an equally miniatureized soft wall made from ferrofluid.
△ Less
Submitted 25 July, 2023; v1 submitted 10 April, 2020;
originally announced April 2020.
-
Cavitation nuclei regeneration in water-particle suspension
Authors:
Adrien Bussonnière,
Qingxia Liu,
Peichun Amy Tsai
Abstract:
Bubble nucleation in water induced by boiling, gas supersaturation or cavitation usually originates from pre-existing gas cavities trapped into solid defects. Even though the destabilization of such gas pockets, called nuclei, has been extensively studied, little is known on the nuclei dynamic. Here, nuclei of water-particle suspensions are excited by acoustic cavitation, and their dynamic is inve…
▽ More
Bubble nucleation in water induced by boiling, gas supersaturation or cavitation usually originates from pre-existing gas cavities trapped into solid defects. Even though the destabilization of such gas pockets, called nuclei, has been extensively studied, little is known on the nuclei dynamic. Here, nuclei of water-particle suspensions are excited by acoustic cavitation, and their dynamic is investigated by monitoring the cavitation probability over several thousand pulses. A stable and reproducible cavitation probability emerges after a few thousand pulses and depends on particle concentration, hydrophobicity, and dissolved gas content. Our observations indicate that a stable nuclei distribution is reached at a later-time, different from previously reported nuclei depletion in early-time. This apparent paradox is elucidated by varying the excitation rate, where the cavitation activity increases with the repetition period, indicating that the nuclei depletion is balanced by spontaneous nucleation or growth of nuclei. A model of this self-supporting generation of nuclei suggests an origin from dissolved gas adsorption on surfaces. The method developed can be utilized to further understand the spontaneous formation and distribution of nano-sized bubbles on heterogeneous surfaces.
△ Less
Submitted 16 December, 2019;
originally announced December 2019.
-
Direct observation of heterogeneous valence state in Yb-based quasicrystalline approximants
Authors:
M. Matsunami,
M. Oura,
K. Tamasaku,
T. Ishikawa,
S. Ideta,
K. Tanaka,
T. Takeuchi,
T. Yamada,
A. P. Tsai,
K. Imura,
K. Deguchi,
N. K. Sato,
T. Ishimasa
Abstract:
We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au$_{64}$Ge$_{22}$Yb$_{14}$ (AGY-I), Au$_{63.5}$Ge$_{20.5}$Yb$_{16}$ (AGY-II), and Zn$_{85.4}$Yb$_{14.6}$ (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4$f$ state and a valence fluctuation…
▽ More
We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, Au$_{64}$Ge$_{22}$Yb$_{14}$ (AGY-I), Au$_{63.5}$Ge$_{20.5}$Yb$_{16}$ (AGY-II), and Zn$_{85.4}$Yb$_{14.6}$ (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately observe a fully occupied Yb 4$f$ state and a valence fluctuation derived Kondo resonance peak, reflecting two inequivalent Yb sites, a single Yb atom in the cluster center and its surrounding Yb icosahedron, respectively. The fully occupied 4$f$ signal is absent in AGY-I containing no Yb atom in the cluster center. The results provide direct evidence for a heterogeneous valence state in AGY-II and Zn-Yb.
△ Less
Submitted 11 December, 2017;
originally announced December 2017.
-
Evaporation-triggered Wetting Transition for Water Droplets upon Hydrophobic Microstructures
Authors:
Peichun Tsai,
Rob G. H. Lammertink,
Matthias Wessling,
Detlef Lohse
Abstract:
When placed on rough hydrophobic surfaces, water droplets of diameter larger than a few millimeters can easily form pearls, as they are in the Cassie-Baxter state with air pockets trapped underneath the droplet. Intriguingly, a natural evaporating process can drive such a Fakir drop into a completely wetting (Wenzel) state. Our microscopic observations with simultaneous side and bottom views of…
▽ More
When placed on rough hydrophobic surfaces, water droplets of diameter larger than a few millimeters can easily form pearls, as they are in the Cassie-Baxter state with air pockets trapped underneath the droplet. Intriguingly, a natural evaporating process can drive such a Fakir drop into a completely wetting (Wenzel) state. Our microscopic observations with simultaneous side and bottom views of evaporating droplets upon transparent hydrophobic microstructures elucidate the water-filling dynamics and the mechanism of this evaporation-triggered transition. For the present material the wetting transition occurs when the water droplet size decreases to a few hundreds of micrometers in radius. We present a general global energy argument which estimates the interfacial energies depending on the drop size and can account for the critical radius for the transition.
△ Less
Submitted 28 September, 2009;
originally announced September 2009.
-
The light-well: A tuneable free-electron light source on a chip
Authors:
G. Adamo,
Y. H. Fu,
C-M. Wang,
K. F. MacDonald,
D. P. Tsai,
F. J. Garcia de Abajo,
N. I. Zheludev
Abstract:
The passage of a free-electron beam through a nano-hole in a periodically layered metal/dielectric structure creates a new type of tuneable, nanoscale radiation source - a 'light-well'. With a lateral size of just a few hundred nanometers, and an emission intensity of ~200 W/cm^2 such light-wells may be employed in nanophotonic circuits as chip-scale sources, or in densely packed ensembles for o…
▽ More
The passage of a free-electron beam through a nano-hole in a periodically layered metal/dielectric structure creates a new type of tuneable, nanoscale radiation source - a 'light-well'. With a lateral size of just a few hundred nanometers, and an emission intensity of ~200 W/cm^2 such light-wells may be employed in nanophotonic circuits as chip-scale sources, or in densely packed ensembles for optical memory and display applications.
△ Less
Submitted 13 July, 2009;
originally announced July 2009.
-
Electrolytically Generated Nanobubbles on HOPG Surfaces
Authors:
Shangjiong Yang,
Peichun Tsai,
E. Stefan Kooij,
Andrea Prosperetti,
Harold J. W. Zandvliet,
Detlef Lohse
Abstract:
Electrolysis of water is employed to produce surface nanobubbles on highly orientated pyrolytic graphite (HOPG) surfaces. Hydrogen (oxygen) nanobubbles are formed when the HOPG surface acts as negative (positive) electrode. Coverage and volume of the nanobubbles enhance with increasing voltage. The yield of hydrogen nanobubbles is much larger than the yield of oxygen nanobubbles. The growth of t…
▽ More
Electrolysis of water is employed to produce surface nanobubbles on highly orientated pyrolytic graphite (HOPG) surfaces. Hydrogen (oxygen) nanobubbles are formed when the HOPG surface acts as negative (positive) electrode. Coverage and volume of the nanobubbles enhance with increasing voltage. The yield of hydrogen nanobubbles is much larger than the yield of oxygen nanobubbles. The growth of the individual nanobubbles during the electrolysis process is recorded in time with the help of AFM measurements and correlated with the total current. Both the size of the individual nanobubbles and the total current saturate after typical 1 minute; then the nanobubbles are in a dynamic equilibrium, meaning that they do not further grow, in spite of ongoing gas production and nonzero current. The surface area of nanobubbles shows a good correlation with the nanobubble volume growth rate, suggesting that either the electrolytic gas emerges directly at the nanobubbles' surface, or it emerges at the electrode's surface and then diffuses through the nanobubbles' surface. Moreover, the experiments reveal that the time constants of the current and the aspect ratio of nanobubbles are the same under all conditions. Replacement of pure water by water containing a small amount of sodium chloride (0.01 M) allows for larger currents, but qualitatively gives the same results.
△ Less
Submitted 25 October, 2008;
originally announced October 2008.
-
Localized states in sheared electroconvection
Authors:
Peichun Tsai,
Stephen W. Morris,
Zahir A. Daya
Abstract:
Electroconvection in a thin, sheared fluid film displays a rich sequence of bifurcations between different flow states as the driving voltage is increased. We present a numerical study of an annular film in which a radial potential difference acts on induced surface charges to drive convection. The film is also sheared by independently rotating the inner edge of the annulus. This simulation mode…
▽ More
Electroconvection in a thin, sheared fluid film displays a rich sequence of bifurcations between different flow states as the driving voltage is increased. We present a numerical study of an annular film in which a radial potential difference acts on induced surface charges to drive convection. The film is also sheared by independently rotating the inner edge of the annulus. This simulation models laboratory experiments on electroconvection in sheared smectic liquid crystal films. The applied shear competes with the electrical forces, resulting in oscillatory and strongly subcritical bifurcations between localized vortex states close to onset. At higher forcing, the flow becomes chaotic via a Ruelle-Takens-Newhouse scenario. The simulation allows flow visualization not available in the physical experiments, and sheds light on previously observed transitions in the current-voltage characteristics of electroconvecting smectic films.
△ Less
Submitted 12 September, 2008; v1 submitted 4 July, 2008;
originally announced July 2008.
-
Charge Transport Scalings in Turbulent Electroconvection
Authors:
Peichun Tsai,
Zahir A. Daya,
Stephen W. Morris
Abstract:
We describe a local-power law scaling theory for the mean dimensionless electric current $Nu$ in turbulent electroconvection. The experimental system consists of a weakly conducting, submicron thick liquid crystal film supported in the annulus between concentric circular electrodes. It is driven into electroconvection by an applied voltage between its inner and outer edges. At sufficiently large…
▽ More
We describe a local-power law scaling theory for the mean dimensionless electric current $Nu$ in turbulent electroconvection. The experimental system consists of a weakly conducting, submicron thick liquid crystal film supported in the annulus between concentric circular electrodes. It is driven into electroconvection by an applied voltage between its inner and outer edges. At sufficiently large voltage differences, the flow is unsteady and electric charge is turbulently transported between the electrodes. Our theoretical development, which closely parallels the Grossmann-Lohse model for turbulent thermal convection, predicts the local-power law $Nu \sim F(Γ) {\cal R}^γ {\cal P}^δ$. ${\cal R}$ and ${\cal P}$ are dimensionless numbers that are similar to the Rayleigh and Prandtl numbers of thermal convection, respectively. The dimensionless function $F(Γ)$, which is specified by the model, describes the dependence of $Nu$ on the aspect ratio $Γ$. We find that measurements of $Nu$ are consistent with the theoretical model.
△ Less
Submitted 2 January, 2005;
originally announced January 2005.
-
Aspect ratio dependence of charge transport in turbulent electroconvection
Authors:
Peichun Tsai,
Zahir A. Daya,
Stephen W. Morris
Abstract:
We present measurements of the normalized charge transport or Nusselt number $\rm Nu$ as a function of the aspect ratio $Γ$ for turbulent convection in an electrically driven film. In analogy with turbulent Rayleigh-B{é}nard convection, we develop the relevant theoretical framework in which we discuss the local-power-law-scaling of $\rm Nu$ with a dimensionless electrical forcing parameter…
▽ More
We present measurements of the normalized charge transport or Nusselt number $\rm Nu$ as a function of the aspect ratio $Γ$ for turbulent convection in an electrically driven film. In analogy with turbulent Rayleigh-B{é}nard convection, we develop the relevant theoretical framework in which we discuss the local-power-law-scaling of $\rm Nu$ with a dimensionless electrical forcing parameter $\cal R$. For these experiments where $10^4 \lesssim {\cal R} \lesssim 2 \times 10^5$ we find that ${\rm Nu} \sim {\rm F}(Γ){\cal R}^γ$ with $γ$ either $ = 0.26 (\pm 0.02)$ or $0.20 (\pm 0.03)$, in excellent agreement with the theoretical predictions of $γ= 1/4$ and 1/5. Our measurements of the aspect ratio-dependence of ${\rm Nu}$ for $0.3 \leq Γ\leq 17$ compares favorably with the function ${\rm F}(Γ)$ from the scaling theory.
△ Less
Submitted 19 September, 2003;
originally announced September 2003.
-
A quasi-unit cell model for Al-Ni-Co Ideal Quasicrystal based on clusters with broken 10-fold symmetry
Authors:
E. Abe,
K. Saitoh,
H. Takakura,
A. P. Tsai,
P. J. Steinhardt,
H. -C. Jeong
Abstract:
We present new evidence supporting the quasi-unit cell description of the $Al_{72}Ni_{20}Co_{8}$ decagonal quasicrystal which shows that the solid is composed of repeating, overlapping decagonal cluster columns with broken 10-fold symmetry. We propose an atomic model which gives a significantly improved fit to electron microscopy experiments compared to a previous proposal by us and to alternati…
▽ More
We present new evidence supporting the quasi-unit cell description of the $Al_{72}Ni_{20}Co_{8}$ decagonal quasicrystal which shows that the solid is composed of repeating, overlapping decagonal cluster columns with broken 10-fold symmetry. We propose an atomic model which gives a significantly improved fit to electron microscopy experiments compared to a previous proposal by us and to alternative proposals with 10-fold symmetric clusters.
△ Less
Submitted 6 October, 1999; v1 submitted 10 July, 1999;
originally announced July 1999.