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Chinese Physics, 2006, Vol. 15(4): 822-827    DOI: 10.1088/1009-1963/15/4/026
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Local density of states of dc-biased superlattices with time-dependent imperfection

Yan Wei-Xian (阎维贤), Li Xiang-Rong (李向荣)
Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006, China
Abstract  The single-particle Green's function for a dc-biased superlattices with single impurity potential varying harmonically with time has been obtained in the framework of U(t,t') method and Floquet--Green's function. The calculation of the local density of states shows that new states will emerge between the resonant Wannier--Stark states as a result of the intervention of time-dependent impurity potential, and the increase in electric field strength of impurity will result in the growing of the number of new states between the gaps of neighbouring Stark ladders.
Keywords:  local density of states      Floquet-Green's function      defects and impurity  
Received:  21 December 2005      Revised:  19 January 2006      Accepted manuscript online: 
PACS:  71.20.Nr (Semiconductor compounds)  
  71.15.Ap (Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.))  
  71.55.-i (Impurity and defect levels)  
  72.20.Ee (Mobility edges; hopping transport)  
  73.21.Cd (Superlattices)  
Fund: Project supported by the Natural Science Foundation of Shanxi Province (Grant No 20031006).

Cite this article: 

Yan Wei-Xian (阎维贤), Li Xiang-Rong (李向荣) Local density of states of dc-biased superlattices with time-dependent imperfection 2006 Chinese Physics 15 822

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