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Quasi-energy spectrum of multiband superlattices in dc-ac electric fields
Zhao, XG; Niu, Q
1996
发表期刊PHYSICS LETTERS A
ISSN0375-9601
卷号222期号:6页码:435-439
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.
部门归属UNIV TEXAS, DEPT PHYS, AUSTIN, TX 78712 USA; ACAD SINICA, INST THEORET PHYS, BEIJING 100080, PEOPLES R CHINA
关键词Tightly Bound Electrons Wannier-stark Ladders Dynamic Localization Charged-particle Time States Motion Band
学科领域Physics
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收录类别SCI
WOS记录号WOS:A1996VU07600012
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12559
专题理论物理所1978-2010年知识产出
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Zhao, XG,Niu, Q. Quasi-energy spectrum of multiband superlattices in dc-ac electric fields[J]. PHYSICS LETTERS A,1996,222(6):435-439.
APA Zhao, XG,&Niu, Q.(1996).Quasi-energy spectrum of multiband superlattices in dc-ac electric fields.PHYSICS LETTERS A,222(6),435-439.
MLA Zhao, XG,et al."Quasi-energy spectrum of multiband superlattices in dc-ac electric fields".PHYSICS LETTERS A 222.6(1996):435-439.
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