Strain-Induced Quantum Phase Transitions in Magic-Angle Graphene
| Autor: | Johannes Hauschild, Nick Bultinck, Michael P. Zaletel, Daniel E. Parker, Tomohiro Soejima |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Quantum phase transition
Phase transition General Physics Magic angle Materials science Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Graphene FOS: Physical sciences General Physics and Astronomy Renormalization group MONOLAYER Mathematical Sciences law.invention Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Engineering Physics and Astronomy STATES Liquid crystal law Physical Sciences Bilayer graphene Phase diagram |
| Zdroj: | Physical review letters, vol 127, iss 2 PHYSICAL REVIEW LETTERS |
| ISSN: | 0031-9007 1079-7114 |
| Popis: | 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 (epsilon similar to 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. |
| Databáze: | OpenAIRE |
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