Optical conductivity of a quasi–one-dimensional system with fluctuating order

Bartosch, Lorenz

doi:10.1209/epl/i2003-10042-2

Cited by 1 publication

(1 citation statement)

References 30 publications

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“…For the Holstein model, it is related to the weak pinning of a charge-density wave by onsite disorder [64]. For the SSH model, similar results were also obtained from the fluctuating gap model, where order parameter fluctuations are modeled as off-diagonal disorder [62,63,[65][66][67].…”

Section: Relation To Disorder Problemssupporting

confidence: 53%

Thermodynamic and spectral properties of adiabatic Peierls chains

2016

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We present exact numerical results for the effects of thermal fluctuations on the experimentally relevant thermodynamic and spectral properties of Peierls chains. To this end, a combination of classical Monte Carlo sampling and exact diagonalization is used to study adiabatic half-filled Holstein and Su-Schrieffer-Heeger models. The classical nature of the lattice displacements in combination with parallel tempering permit simulations on large system sizes and a direct calculation of spectral functions in the frequency domain. Most notably, the long-range order and the associated Peierls gap give rise to a distinct low-temperature peak in the specific heat. The closing of the gap and suppression of order by thermal fluctuations involves in-gap excitations in the form of soliton-antisoliton pairs, and is also reflected in the dynamic density and bond structure factors as well as in the optical conductivity. We compare our data to the widely used mean-field approximation, and highlight relations to symmetry-protected topological phases and disorder problems.

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