Theory for Cd3As2 thin films in the presence of magnetic fields

Smith, Michael; Quito, Victor L.; Burkov, A. A.; Orth, Peter P.; Martin, Ivar

doi:10.1103/physrevb.109.155136

Title: Theory for Cd 3 As 2 thin films in the presence of magnetic fields

Journal Article · 11 April 2024 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.109.155136 · OSTI ID:2386968

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^[2]; Burkov, A. A. ^[3];

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Argonne National Laboratory (ANL), Argonne, IL (United States)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Univ. of Sao Paulo (Brazil)
Univ. of Waterloo, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Saarland University Campus, Saarbrücken (Germany)

Here we present a theory for thin films of the Dirac semimetal Cd₃⁢As₂ in the presence of magnetic fields. We show that, above a critical thickness, specific subbands n of thin film Cd₃⁢As₂ are in a quantum spin Hall insulator regime and study their response to in- and out-of-plane magnetic fields. We find that sufficiently large in-plane Zeeman fields drive the system toward a 2D Dirac semimetal regime, provided the field is directed perpendicular to a high-symmetry mirror plane. For other directions, we find the Dirac points to be weakly gapped. We further investigate how the system responds to finite out-of-plane field components, both starting from the quantum spin Hall regime at small in-plane fields and from the 2D Dirac semimetal regimes at larger in-plane fields, addressing recent experimental observations in A. C. Lygo et al. [Phys. Rev. Lett. 130, 046201 (2023)] and B. Guo et al. [Phys. Rev. Lett. 131, 046601 (2023)].

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2386968

Report Number(s):: IS-J--11,375

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 15 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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