File Download
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1103/PhysRevLett.123.157601
- Scopus: eid_2-s2.0-85073469777
- PMID: 31702323
- WOS: WOS:000489255500006
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Valence Bond Orders at Charge Neutrality in a Possible Two-Orbital Extended Hubbard Model for Twisted Bilayer Graphene
Title | Valence Bond Orders at Charge Neutrality in a Possible Two-Orbital Extended Hubbard Model for Twisted Bilayer Graphene |
---|---|
Authors | |
Keywords | Dirac fermions Order parameters Quantum phase transitions Quantum spin Hall effect Bilayer films |
Issue Date | 2019 |
Publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prl/ |
Citation | Physical Review Letters, 2019, v. 123 n. 15, p. 157601:1-157601:6 How to Cite? |
Abstract | An extended Hubbard model on a honeycomb lattice with two orbitals per site at charge neutrality is investigated with unbiased large-scale quantum Monte Carlo simulations. The Fermi velocity of the Dirac fermions is renormalized as the cluster charge interaction increases, until a mass term emerges and a quantum phase transition from Dirac semimetal to valence bond solid (VBS) insulator is established. The quantum critical point is discovered to belong to the 3D N=4 Gross-Neveu chiral XY universality with the critical exponents obtained at high precision. Further enhancement of the interaction drives the system into two different VBS phases, the properties and transition between them are also revealed. Since the model is related to magic-angle twisted bilayer graphene, our results may have relevance towards the symmetry breaking order at the charge neutrality point of the material, and associate the wide range of universal strange metal behavior around it with quantum critical fluctuations. |
Persistent Identifier | http://hdl.handle.net/10722/278606 |
ISSN | 2023 Impact Factor: 8.1 2023 SCImago Journal Rankings: 3.040 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Da Liao, Y | - |
dc.contributor.author | Meng, ZY | - |
dc.contributor.author | Xu, XY | - |
dc.date.accessioned | 2019-10-21T02:10:39Z | - |
dc.date.available | 2019-10-21T02:10:39Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Physical Review Letters, 2019, v. 123 n. 15, p. 157601:1-157601:6 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/10722/278606 | - |
dc.description.abstract | An extended Hubbard model on a honeycomb lattice with two orbitals per site at charge neutrality is investigated with unbiased large-scale quantum Monte Carlo simulations. The Fermi velocity of the Dirac fermions is renormalized as the cluster charge interaction increases, until a mass term emerges and a quantum phase transition from Dirac semimetal to valence bond solid (VBS) insulator is established. The quantum critical point is discovered to belong to the 3D N=4 Gross-Neveu chiral XY universality with the critical exponents obtained at high precision. Further enhancement of the interaction drives the system into two different VBS phases, the properties and transition between them are also revealed. Since the model is related to magic-angle twisted bilayer graphene, our results may have relevance towards the symmetry breaking order at the charge neutrality point of the material, and associate the wide range of universal strange metal behavior around it with quantum critical fluctuations. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prl/ | - |
dc.relation.ispartof | Physical Review Letters | - |
dc.rights | Physical Review Letters. Copyright © American Physical Society. | - |
dc.rights | Copyright [2019] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevLett.123.157601 ]. | - |
dc.subject | Dirac fermions | - |
dc.subject | Order parameters | - |
dc.subject | Quantum phase transitions | - |
dc.subject | Quantum spin Hall effect | - |
dc.subject | Bilayer films | - |
dc.title | Valence Bond Orders at Charge Neutrality in a Possible Two-Orbital Extended Hubbard Model for Twisted Bilayer Graphene | - |
dc.type | Article | - |
dc.identifier.email | Meng, ZY: zymeng@hku.hk | - |
dc.identifier.authority | Meng, ZY=rp02524 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevLett.123.157601 | - |
dc.identifier.pmid | 31702323 | - |
dc.identifier.scopus | eid_2-s2.0-85073469777 | - |
dc.identifier.hkuros | 307299 | - |
dc.identifier.volume | 123 | - |
dc.identifier.issue | 15 | - |
dc.identifier.spage | 157601:1 | - |
dc.identifier.epage | 157601:6 | - |
dc.identifier.isi | WOS:000489255500006 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0031-9007 | - |