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Title: Significance of decay mechanism into continuum in dynamical Wannier-Stark ladder

We examine the resonance structure of photodressed electron states of laser-driven Wannier-Stark ladder, namely, dynamic Wannier-Stark ladder, in terms of the excess density of states (DOS) closely related to a lifetime of the state of concern. It is revealed that the resonance structure in the strong laser-field region shows clear dependence on the ratio, η, of a Bloch-frequency to a laser frequency. As the laser strength increases, for η = 1, the excess DOS becomes involved with a lot of newly-growing resonance peaks. This result would be understood from the viewpoint of a Fano-like decay-mechanism caused by a multichannel continuum effect, in marked contrast to the cases of larger η’s; for η = 3, the excess DOS just is found to show a pronounced red-shift of a single dominant peak caused by a single-channel continuum effect.
Authors:
 [1] ; ;  [2]
  1. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, 305-8573 (Japan)
  2. Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan and Center for computational Sciences, University of Tsukuba, Tsukuba 305-8577 (Japan)
Publication Date:
OSTI Identifier:
22261801
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DENSITY; LASER RADIATION; LASERS; PEAKS; RED SHIFT; RESONANCE