Nonequilibrium ``Melting'' of a Charge Density Wave Insulator via an Ultrafast Laser Pulse

Nonequilibrium “Melting” of a Charge Density Wave Insulator via an Ultrafast Laser Pulse

Wen Shen, Yizhi Ge, A. Y. Liu, H. R. Krishnamurthy, T. P. Devereaux, and J. K. Freericks

Phys. Rev. Lett. 112, 176404 – Published 2 May 2014

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 ${TaS}_{2}$ and ${TbTe}_{3}$ , indicating a quasiuniversality for nonequilibrium “melting” with qualitative features that can be easily understood within a simple picture.

Received 21 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.176404

Authors & Affiliations

Wen Shen¹, Yizhi Ge¹, A. Y. Liu¹, H. R. Krishnamurthy^2,3, T. P. Devereaux^4,5, and J. K. Freericks¹

¹Department of Physics, Georgetown University, Washington, D.C. 20057, USA
²Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560012, India
³Department of Physics, India Institute of Science, Bangalore 560012, India
⁴SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94305, USA
⁵Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA

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Issue

Vol. 112, Iss. 17 — 2 May 2014

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