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Condensed Matter > Superconductivity

arXiv:2504.20393 (cond-mat)
[Submitted on 29 Apr 2025 (v1), last revised 2 Aug 2026 (this version, v4)]

Title:Emergent superconductivity and non-reciprocal transport in a van der Waals Dirac semimetal/antiferromagnet heterostructure

Authors:Saurav Islam, Max Stanley, Anthony Richardella, Seungjun Lee, Kalana D. Halanayake, Sandra Santhosh, Danielle Reifsnyder Hickey, Tony Low, Nitin Samarth
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Abstract:We investigate emergent superconductivity and non-reciprocal transport (magnetochiral anisotropy, superconducting diode effect) at the heterointerface of two non-superconducting van der Waals (vdW) materials, the Dirac semimetal ZrTe$_2$ and the antiferromagnetic iron chalcogenide FeTe, grown using molecular beam epitaxy. We show from electrical transport measurements that two-dimensional (2D) superconductivity arises at the heterointerface below a critical temperature $T_c \sim 10$~K. In the superconducting transition region, non-reciprocal transport, characterized by the magneto-chiral anisotropy, exhibits a magnitude comparable to that observed in topological insulators, and is enhanced by a factor of three when the heterostructure is capped with a 2D vdW ferromagnet (CrTe$_2$). Below $T_c$, the superconducting diode effect exhibits an efficiency of 29\%. With strong spin-orbit coupling in ZrTe$_2$, these epitaxial heterostructures provide an attractive epitaxial vdW platform for exploring unconventional superconductivity in Dirac semimetals and for developing non-reciprocal devices for superconducting electronics.
Subjects: Superconductivity (cond-mat.supr-con)
Cite as: arXiv:2504.20393 [cond-mat.supr-con]
  (or arXiv:2504.20393v4 [cond-mat.supr-con] for this version)
  https://doi.org/10.48550/arXiv.2504.20393

Submission history

From: Nitin Samarth [view email]
[v1] Tue, 29 Apr 2025 03:32:54 UTC (33,517 KB)
[v2] Mon, 5 May 2025 19:26:06 UTC (33,517 KB)
[v3] Mon, 30 Mar 2026 15:38:30 UTC (8,910 KB)
[v4] Sun, 2 Aug 2026 00:39:18 UTC (5,168 KB)
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