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Chinese Physics, 2007, Vol. 16(12): 3766-3771    DOI: 10.1088/1009-1963/16/12/035
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Pressure effect on the electron mobility in AlAs/GaAs quantum wells

Hao Guo-Dong(郝国栋), Ban Shi-Liang(班士良), and Jia Xiu-Min(贾秀敏)
Department of Physics, College of Sciences and Technology, Inner Mongolia University, Hohhot 010021, China
Abstract  By taking the influence of optical phonon modes into account, this paper adopts the dielectric continuum phonon model and force balance equation to investigate the electronic mobility parallel to the interfaces for AlAs/GaAs semiconductor quantum wells (QWs) under hydrostatic pressure. The scattering from confined phonon modes, interface phonon modes and half-space phonon modes are analysed and the dominant scattering mechanisms in wide and narrow QWs are presented. The temperature dependence of the electronic mobility is also studied in the temperature range of optical phonon scattering being available. It is shown that the electronic mobility reduces obviously as pressure increases from 0 to 4GPa, the confined longitudinal optical (LO) phonon modes play an important role in wide QWs, whereas the interface optical phonon modes are dominant in narrow QWs, the half-space LO phonon modes hardly influence the electronic mobility expect for very narrow QWs.
Keywords:  electronic mobility      pressure effect      quantum well  
Accepted manuscript online: 
PACS:  62.50.-p (High-pressure effects in solids and liquids)  
  63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)  
  71.18.+y (Fermi surface: calculations and measurements; effective mass, g factor)  
  72.20.Fr (Low-field transport and mobility; piezoresistance)  
  73.20.At (Surface states, band structure, electron density of states)  
  73.63.Hs (Quantum wells)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No~60566002) and the project for excellence subject-directors of Inner Mongolia Autonomous Region of China.

Cite this article: 

Hao Guo-Dong(郝国栋), Ban Shi-Liang(班士良), and Jia Xiu-Min(贾秀敏) Pressure effect on the electron mobility in AlAs/GaAs quantum wells 2007 Chinese Physics 16 3766

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