Nonequilibrium "melting" of a charge density wave insulator via an ultrafast laser pulse.
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.
Department of Physics, Georgetown University, Washington, D.C. 20057, USA.
Wen
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Shen
Department of Physics, Georgetown University, Washington, D.C. 20057, USA.
Yizhi
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Ge
Department of Physics, Georgetown University, Washington, D.C. 20057, USA.
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Liu
Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560012, India and Department of Physics, India Institute of Science, Bangalore 560012, India.
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Krishnamurthy
SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94305, USA and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.
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Devereaux
Department of Physics, Georgetown University, Washington, D.C. 20057, USA.
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