Nonequilibrium "melting" of a charge density wave insulator via an ultrafast laser pulse

Abstract

We employ an exact solution of the simplest model for pump-probe time-resolved photoemission spectroscopy in charge-density-wave systems to show how, in nonequilibrium the gap in the density of states disappears while the charge density remains modulated, and then the gap reforms after the pulse has passed. This nonequilibrium scenario qualitatively describes the common short-time experimental features in TaS2 and TbTe3 indicating a quasiuniversality for nonequilibrium "melting" with qualitative features that can be easily understood within a simple picture.

(8 pages, 5 figures)

References in corpus (5)

• Fermi surface nesting and the origin of Charge Density Waves in metals
• Theoretical description of time-resolved photoemission spectroscopy: application to pump-probe experiments
• ARPES Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 for R = Y, La, Ce, Sm, Gd, Tb and Dy
• STM Studies of TbTe3: Evidence for a fully Incommensurate Charge Density Wave
• Theoretical description of time-resolved pump/probe photoemission in TaS\_2: a single-band DFT+DMFT(NRG) study within the quasiequilibrium approximation

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