Strain-Induced Quantum Phase Transitions in Magic-Angle Graphene

Parker, Daniel E.; Soejima, Tomohiro; Hauschild, Johannes; Zaletel, Michael P.; Bultinck, Nick

doi:10.1103/physrevlett.127.027601

Strain-Induced Quantum Phase Transitions in Magic-Angle Graphene

Journal Article · Tue Jul 06 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.027601· OSTI ID:1821673

^[1]; Soejima, Tomohiro ^[2]; ^[2]; Zaletel, Michael P. ^[3]; Bultinck, Nick ^[4]

Harvard Univ., Cambridge, MA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Ghent Univ. (Belgium)

In this work, we investigate the effect of uniaxial heterostrain on the interacting phase diagram of magic-angle twisted bilayer graphene. Using both self-consistent Hartree-Fock and density-matrix renormalization group calculations, we find that small strain values (ε~0.1%-0.2%) drive a zero-temperature phase transition between the symmetry-broken "Kramers intervalley-coherent" insulator and a nematic semimetal. The critical strain lies within the range of experimentally observed strain values, and we therefore predict that strain is at least partly responsible for the sample-dependent experimental observations.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation; Research Foundation Flanders (FWO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1821673

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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