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题名: Quasi-energy spectrum of multiband superlattices in dc-ac electric fields
作者: Zhao, XG ;  Niu, Q
刊名: PHYSICS LETTERS A
出版日期: 1996
卷号: 222, 期号:6, 页码:435-439
关键词: TIGHTLY BOUND ELECTRONS ;  WANNIER-STARK LADDERS ;  DYNAMIC LOCALIZATION ;  CHARGED-PARTICLE ;  TIME ;  STATES ;  MOTION ;  BAND
学科分类: Physics
部门归属: UNIV TEXAS, DEPT PHYS, AUSTIN, TX 78712 USA; ACAD SINICA, INST THEORET PHYS, BEIJING 100080, PEOPLES R CHINA
英文摘要: The dynamics of Bloch electrons moving in a two-band superlattice driven by a dc-ac electric field is investigated. We show rigorously that (i) when the matching ratio between the Bloch frequency and the ac frequency is an integer, the spectrum is that of two quasi-energy bands; (ii) when the matching ratio is a rational, the spectrum is two interspaced fractional Wannier-Stark ladders; and (iii) each of these fractional ladders has an energy dispersion due to the interband coupling. We illustrate our findings by explicit calculations of the spectrum in the high-frequency case, and show how the energy dispersion is tuned by the ac field strength and how band collapse occurs.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:A1996VU07600012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12559
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Zhao, XG,Niu, Q. Quasi-energy spectrum of multiband superlattices in dc-ac electric fields[J]. PHYSICS LETTERS A,1996,222(6):435-439.
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