English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Importance of long-ranged electron-electron interactions for the magnetic phase diagram of twisted bilayer graphene

Klebl, L., Goodwin, Z. A. H., Mostofi, A. A., Kennes, D. M., & Lischner, J. (2021). Importance of long-ranged electron-electron interactions for the magnetic phase diagram of twisted bilayer graphene. Physical Review B, 103(19): 195127. doi:10.1103/PhysRevB.103.195127.

Item is

Files

show Files
hide Files
:
PhysRevB.103.195127.pdf (Publisher version), 872KB
Name:
PhysRevB.103.195127.pdf
Description:
-
OA-Status:
Not specified
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
2021
Copyright Info:
© American Physical Society

Locators

show
hide
Locator:
https://dx.doi.org/10.1103/PhysRevB.103.195127 (Publisher version)
Description:
-
OA-Status:
Not specified
Locator:
https://arxiv.org/abs/2012.14499 (Preprint)
Description:
-
OA-Status:
Not specified

Creators

show
hide
 Creators:
Klebl, L.1, Author
Goodwin, Z. A. H.2, Author
Mostofi, A. A.2, Author
Kennes, D. M.1, 3, 4, Author           
Lischner, J.2, Author
Affiliations:
1Institute for Theory of Statistical Physics, RWTH Aachen University, and JARA Fundamentals of Future Information Technology, ou_persistent22              
2Departments of Materials and Physics and the Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free Electron Laser Science, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: Electron-electron interactions are intrinsically long ranged, but many models of strongly interacting electrons only take short-ranged interactions into account. Here, we present results of atomistic calculations including both long-ranged and short-ranged electron-electron interactions for the magnetic phase diagram of twisted bilayer graphene and demonstrate that qualitatively different results are obtained when long-ranged interactions are neglected. In particular, we use Hartree theory augmented with Hubbard interactions and calculate the interacting spin susceptibility at a range of doping levels and twist angles near the first magic angle to identify the dominant magnetic instabilities. At the magic angle, mostly antiferromagnetic order is found, while ferromagnetism dominates at other twist angles. Moreover, long-ranged interactions significantly increase the twist angle window in which strong correlation phenomena can be expected. These findings are in good agreement with available experimental data.

Details

show
hide
Language(s): eng - English
 Dates: 2021-04-282020-12-282021-04-292021-05-122021-05-15
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.103.195127
arXiv: 2012.14499
 Degree: -

Event

show

Legal Case

show

Project information

show hide
Project name : We are grateful for helpful discussions with V. Vitale, K. Atalar, and Xia Liang. Z.G. was supported through a studentship in the Centre for Doctoral Training on Theory and Simulation of Materials at Imperial College London funded by the EPSRC (Grant No. EP/L015579/1). We acknowledge funding from EPSRC Grant No. EP/S025324/1 and the Thomas Young Centre under Grant No. TYC-101. We acknowledge the Imperial College London Research Computing Service [81] for the computational resources used in carrying out this work. The Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) is acknowledged for support through RTG 1995, within the Priority Program SPP 2244 2DMP and under Germany's Excellence Strategy-Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC2004/1-390534769. We acknowledge support from the Max Planck-New York City Center for Non-Equilibrium Quantum Phenomena. Spin susceptibility calculations were performed with computing resources granted by RWTH Aachen University under projects rwth0496 and rwth0589.
Grant ID : -
Funding program : -
Funding organization : -

Source 1

show
hide
Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 (19) Sequence Number: 195127 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008