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26 April 2024 |
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Article overview
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Correlated Configurational States and a Quantum Charge Liquid in Layered Metallic Dichalcogenides | | Jaka Vodeb
; Viktor V. Kabanov
; Yaroslav A. Gerasimenko
; Rok Venturini
; Jan Ravnik
; Marion A. van Midden
; Erik Zupanič
; Petra Šutar
; Dragan Mihailovic
; | | Date: |
8 Jan 2019 | | Abstract: | Two-dimensional metallic dichalcogenides display diverse charge ordering
phenomena, but the mechanisms for the formation of low-temperature commensurate
order have proven surprisingly controversial. Fermi surface instabilities, the
electron-phonon interaction, exciton condensation and strong correlations are
commonly discussed, but each mechanism is typically applied individually, and
is usually applicable only in a certain range of temperature or doping. In this
paper we propose a new and universally applicable viewpoint on charge ordering
in triangular lattices based on the sparse ordering of polarons subject to
(only) screened Coulomb interactions. Using a charged lattice gas model, our
parallel tempering Monte Carlo simulations find stable regularly ordered
polaronic crystals at certain magic filling fractions
$f_{m}=1/3,1/4,1/9,1/13,1/16$ which are observed as $commensurate$ charge
density waves in different materials. Upon doping, a multitude of
near-degenerate domain wall configurations appear which accommodate the doped
charges. In large regions of doping between $f_{m}$, an apparently infinite
number of configurationally near-degenerate states result in an amorphous
state, which is stable down to very low temperatures. The effective degeneracy
of configurational states subject to quantum fluctuations may lead to a quantum
emph{charge} liquid at low temperatures, analogous to the canonical quantum
spin liquid. Critical points, possibly quantum, at $f_{m}$ delineate the
different regions of the phase diagram in accordance with observed doping and
light-induced orders. | | Source: | arXiv, 1901.2232 | | Services: | Forum | Review | PDF | Favorites | |
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