Charge singlets and orbital-selective charge density wave transitions
Abstract
The possibility of “orbitally selective Mott transitions” within a multiband Hubbard model, in which one orbital with large on-site electron-electron repulsion U1 is insulating and another orbital, to which it is hybridized, with small U–1, is metallic, is a problem of long-standing debate and investigation. In this paper we study an analogous phenomenon, the coexistence of metallic and insulating bands in a system of orbitals with different electron-phonon coupling. To this end, we examine two variants of the bilayer Holstein model: a uniform bilayer and a “Holstein-metal interface” where the electron-phonon coupling, λ, is zero in the “metallic” layer. In the uniform bilayer Holstein model, charge density wave (CDW) order dominates at small interlayer hybridization t3, but decreases and eventually vanishes as t3 grows, providing a charge analog of singlet (spin liquid) physics. In the interface case, we show that CDW order penetrates into the metal layer and forms long-range CDW order at an intermediate ratio of inter- to intralayer hopping strengths, 1.4 ≲ t3/t ≲ 3.4. Furthermore, this is consistent with the occurrence of an “orbitally selective CDW” regime at weak t3 in which the layer with λ1 ≠ 0 exhibits long-range charge order, but the “metallic layer” withmore »
- Authors:
-
[1];
- Univ. of California, Davis, CA (United States)
- Beijing Computational Science Research Center (China)
- Univ. Côte d'Azur, Nice (France); National University of Singapore (Singapore); Beijing Computational Science Research Center (China)
- Publication Date:
- Research Org.:
- Univ. of California, Davis, CA (United States)
- Sponsoring Org.:
- NSFC; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1959285
- Alternate Identifier(s):
- OSTI ID: 1975155
- Grant/Contract Number:
- SC0014671; U1930402; 12050410263; 12111530010; 11974039; 12222401
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 11; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Charge density waves; Phase transitions; Quantum phase transitions; Interfaces; Strongly correlated systems; Holstein model; Langevin algorithm; Quantum Monte Carlo
Citation Formats
Zhang, Yuxi, Feng, Chunhan, Mondaini, Rubem, Batrouni, G. G., and Scalettar, Richard T. Charge singlets and orbital-selective charge density wave transitions. United States: N. p., 2022.
Web. doi:10.1103/physrevb.106.115120.
Zhang, Yuxi, Feng, Chunhan, Mondaini, Rubem, Batrouni, G. G., & Scalettar, Richard T. Charge singlets and orbital-selective charge density wave transitions. United States. https://doi.org/10.1103/physrevb.106.115120
Zhang, Yuxi, Feng, Chunhan, Mondaini, Rubem, Batrouni, G. G., and Scalettar, Richard T. Mon .
"Charge singlets and orbital-selective charge density wave transitions". United States. https://doi.org/10.1103/physrevb.106.115120. https://www.osti.gov/servlets/purl/1959285.
@article{osti_1959285,
title = {Charge singlets and orbital-selective charge density wave transitions},
author = {Zhang, Yuxi and Feng, Chunhan and Mondaini, Rubem and Batrouni, G. G. and Scalettar, Richard T.},
abstractNote = {The possibility of “orbitally selective Mott transitions” within a multiband Hubbard model, in which one orbital with large on-site electron-electron repulsion U1 is insulating and another orbital, to which it is hybridized, with small U–1, is metallic, is a problem of long-standing debate and investigation. In this paper we study an analogous phenomenon, the coexistence of metallic and insulating bands in a system of orbitals with different electron-phonon coupling. To this end, we examine two variants of the bilayer Holstein model: a uniform bilayer and a “Holstein-metal interface” where the electron-phonon coupling, λ, is zero in the “metallic” layer. In the uniform bilayer Holstein model, charge density wave (CDW) order dominates at small interlayer hybridization t3, but decreases and eventually vanishes as t3 grows, providing a charge analog of singlet (spin liquid) physics. In the interface case, we show that CDW order penetrates into the metal layer and forms long-range CDW order at an intermediate ratio of inter- to intralayer hopping strengths, 1.4 ≲ t3/t ≲ 3.4. Furthermore, this is consistent with the occurrence of an “orbitally selective CDW” regime at weak t3 in which the layer with λ1 ≠ 0 exhibits long-range charge order, but the “metallic layer” with λ–1 = 0, to which it is hybridized, does not.},
doi = {10.1103/physrevb.106.115120},
journal = {Physical Review. B},
number = 11,
volume = 106,
place = {United States},
year = {Mon Sep 12 00:00:00 EDT 2022},
month = {Mon Sep 12 00:00:00 EDT 2022}
}
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