Time-reversal-broken Weyl semimetal in the Hofstadter regime

Faruk Abdulla, Ankur Das, Sumathi Rao, Ganpathy Murthy

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We study the phase diagram for a lattice model of a time-reversal-broken three-dimensional Weyl semimetal (WSM) in an orbital magnetic field B with a flux of p/q per unit cell (0 ≤ p ≤ q - 1), with minimal crystalline symmetry. We find several interesting phases: (i) WSM phases with 2q, 4q, 6q, and 8q Weyl nodes and corresponding surface Fermi arcs, (ii) a layered Chern insulating (LCI) phase, gapped in the bulk, but with gapless surface states, (iii) a phase in which some bulk bands are gapless with Weyl nodes, coexisting with others that are gapped but topologically nontrivial, adiabatically connected to an LCI phase, (iv) a new gapped trivially insulating phase (I0) with (non-topological) counter-propagating surface states, which could be gapped out in the absence of crystal symmetries. Importantly, we are able to obtain the phase boundaries analytically for all p, q. Analyzing the gaps for p = 1 and very large q enables us to smoothly take the zero-field limit, even though the phase diagrams look ostensibly very different for q = 1, B = 0, and q → ∞, B → 0.

Original languageEnglish
Article number014
JournalSciPost Physics Core
Volume5
Issue number1
DOIs
StatePublished - Jan 2022

Bibliographical note

Funding Information:
AD was supported by the German-Israeli Foundation (GIF) Grant No. I-1505-303.10/ 2019 and the Minerva Foundation. AD also thanks Dean of Faculty fellowship Weizmann Institute of Science, Israel, Israel planning and budgeting committee, and Koshland Foundation for financial support. SR and GM would like to thank the VAJRA scheme of SERB, India for its support. GM is grateful for partial support from the US-Israel Binational Science Foundation (Grant No. 2016130) and the Aspen Center for Physics (NSF grant PHY-1607611) where this was completed.

Funding Information:
AD was supported by the German-Israeli Foundation (GIF) Grant No. I-1505-303.10/2019 and the Minerva Foundation. AD also thanks Dean of Faculty fellowship Weizmann Institute of Science, Israel, Israel planning and budgeting committee, and Koshland Foundation for financial support. SR and GM would like to thank the VAJRA scheme of SERB, India for its support. GM is grateful for partial support from the US-Israel Binational Science Foundation (Grant No. 2016130) and the Aspen Center for Physics (NSF grant PHY-1607611) where this was completed.

Publisher Copyright:
Copyright F. Abdulla et al.

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics
  • Statistical and Nonlinear Physics

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