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

Abstract

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
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
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); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DENSITY; LASER RADIATION; LASERS; PEAKS; RED SHIFT; RESONANCE

Citation Formats

Nemoto, Yuya, Maeshima, Nobuya, and Hino, Ken-ichi. Significance of decay mechanism into continuum in dynamical Wannier-Stark ladder. United States: N. p., 2013. Web. doi:10.1063/1.4848375.
Nemoto, Yuya, Maeshima, Nobuya, & Hino, Ken-ichi. Significance of decay mechanism into continuum in dynamical Wannier-Stark ladder. United States. https://doi.org/10.1063/1.4848375
Nemoto, Yuya, Maeshima, Nobuya, and Hino, Ken-ichi. 2013. "Significance of decay mechanism into continuum in dynamical Wannier-Stark ladder". United States. https://doi.org/10.1063/1.4848375.
@article{osti_22261801,
title = {Significance of decay mechanism into continuum in dynamical Wannier-Stark ladder},
author = {Nemoto, Yuya and Maeshima, Nobuya and Hino, Ken-ichi},
abstractNote = {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.},
doi = {10.1063/1.4848375},
url = {https://www.osti.gov/biblio/22261801}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1566,
place = {United States},
year = {Wed Dec 04 00:00:00 EST 2013},
month = {Wed Dec 04 00:00:00 EST 2013}
}