Thermodynamics of correlated electrons in a magnetic field
The Hofstadter–Hubbard model captures the physics of strongly correlated electrons in an applied magnetic field, which is relevant to many recent experiments on Moiré materials. Few large-scale, numerically exact simulations exists for this model. In this work, we simulate the Hubbard–Hofstadter mod...
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Published in | Communications physics Vol. 5; no. 1; pp. 1 - 7 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
10.08.2022
Nature Publishing Group Springer Nature Nature Portfolio |
Subjects | |
Online Access | Get full text |
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Summary: | The Hofstadter–Hubbard model captures the physics of strongly correlated electrons in an applied magnetic field, which is relevant to many recent experiments on Moiré materials. Few large-scale, numerically exact simulations exists for this model. In this work, we simulate the Hubbard–Hofstadter model using the determinant quantum Monte Carlo (DQMC) algorithm. We report the field and Hubbard interaction strength dependence of charge compressibility, fermion sign, local moment, magnetic structure factor, and specific heat. The gross structure of magnetic Bloch bands and band gaps determined by the non-interacting Hofstadter spectrum is preserved in the presence of
U
. Incompressible regions of the phase diagram have improved fermion sign. At half filling and intermediate and larger couplings, a strong orbital magnetic field delocalizes electrons and reduces the effect of Hubbard
U
on thermodynamic properties of the system.
The Hofstadter–Hubbard model on 2D square lattices is a paradigmatic model to study the interplay of electron correlations and external magnetic field. The authors use quantum Monte Carlo to study the thermodynamic properties of the Hofstadter Hamiltonian at intermediate to strong coupling, finding that a strong orbital magnetic field delocalizes electrons and reduces the effective Hubbard interaction. |
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Bibliography: | USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division AC02-76SF00515; GBMF 4305; GBMF 8691; GBMF 4302; GBMF 8686; AC02-05CH11231 Gordon and Betty Moore Foundation |
ISSN: | 2399-3650 2399-3650 |
DOI: | 10.1038/s42005-022-00968-2 |