A two-dimensional Falicov-Kimball model, equivalent to the Hubbard model
in an unconstrained slave-spin representation, is studied by quantum
Monte Carlo simulations. The focus is on a fractionalized metallic phase
that is characterized in terms of spectral, thermodynamic, and transport
properties, including a comparison to the half-filled Hubbard model. The
properties of this phase, most notably a single-particle gap but gapless
spin and charge excitations, can in principle be understood in the
framework of orthogonal metals. However, important and interesting
differences arise in the present setting compared to single-particle
mean-field theories and other models. We also discuss the role of the
local constraints from the slave-spin representation within an extended
phase diagram that includes the spatial dimension as a parameter,
thereby making contact with previous work in infinite dimensions.
Finally, we highlight the absence of pi-flux configurations in the
slave-spin formulation, in particular in the context of topologically
ordered fractional phases predicted at the mean-field level.
%0 Journal Article
%1 ISI:000486638400003
%A Hohenadler, Martin
%A Assaad, Fakher F.
%D 2019
%J Phys. Rev. B
%K a
%N 12
%P 125133
%R 10.1103/PhysRevB.100.125133
%T Orthogonal metal in the Hubbard model with liberated slave spins
%U https://link.aps.org/doi/10.1103/PhysRevB.100.125133
%V 100
%X A two-dimensional Falicov-Kimball model, equivalent to the Hubbard model
in an unconstrained slave-spin representation, is studied by quantum
Monte Carlo simulations. The focus is on a fractionalized metallic phase
that is characterized in terms of spectral, thermodynamic, and transport
properties, including a comparison to the half-filled Hubbard model. The
properties of this phase, most notably a single-particle gap but gapless
spin and charge excitations, can in principle be understood in the
framework of orthogonal metals. However, important and interesting
differences arise in the present setting compared to single-particle
mean-field theories and other models. We also discuss the role of the
local constraints from the slave-spin representation within an extended
phase diagram that includes the spatial dimension as a parameter,
thereby making contact with previous work in infinite dimensions.
Finally, we highlight the absence of pi-flux configurations in the
slave-spin formulation, in particular in the context of topologically
ordered fractional phases predicted at the mean-field level.
@article{ISI:000486638400003,
abstract = {A two-dimensional Falicov-Kimball model, equivalent to the Hubbard model
in an unconstrained slave-spin representation, is studied by quantum
Monte Carlo simulations. The focus is on a fractionalized metallic phase
that is characterized in terms of spectral, thermodynamic, and transport
properties, including a comparison to the half-filled Hubbard model. The
properties of this phase, most notably a single-particle gap but gapless
spin and charge excitations, can in principle be understood in the
framework of orthogonal metals. However, important and interesting
differences arise in the present setting compared to single-particle
mean-field theories and other models. We also discuss the role of the
local constraints from the slave-spin representation within an extended
phase diagram that includes the spatial dimension as a parameter,
thereby making contact with previous work in infinite dimensions.
Finally, we highlight the absence of pi-flux configurations in the
slave-spin formulation, in particular in the context of topologically
ordered fractional phases predicted at the mean-field level.},
added-at = {2019-10-27T14:16:09.000+0100},
article-number = {125133},
author = {Hohenadler, Martin and Assaad, Fakher F.},
biburl = {https://www.bibsonomy.org/bibtex/275a7007b385d36766da218e29850ff8a/ctqmat},
day = 16,
doi = {10.1103/PhysRevB.100.125133},
eissn = {2469-9969},
interhash = {53f2ea7b4cf4b937d8cd114c5d13493f},
intrahash = {75a7007b385d36766da218e29850ff8a},
issn = {2469-9950},
journal = {Phys. Rev. B},
keywords = {a},
month = {9},
number = 12,
pages = 125133,
timestamp = {2023-01-16T14:49:29.000+0100},
title = {Orthogonal metal in the Hubbard model with liberated slave spins},
type = {Publication},
unique-id = {ISI:000486638400003},
url = {https://link.aps.org/doi/10.1103/PhysRevB.100.125133},
volume = 100,
year = 2019
}