Degenerate Effect on the Mobility of Holes in Graphane: A Study Based on Density Functional Theory Coupled with Deformation Potential Theory.
The traditional deformation potential method is not able to calculate the charge mobility of heavily doped degenerate semiconductors, in which inter-band scattering is not negligible. To theoretically predict the charge mobility of such semiconductors, an improved deformation potential method is required, in which the deformation potential constant is decomposed into two parts (hydrostatic and uniaxial terms) based on k⋅p theory to incorporate the inter-band scattering between degenerate valence bands. We propose a new method to calculate the heavy- and light-hole mobilities of graphane. The proposed method produces more appropriate values than the traditional methods. Hence, the new method can be applied to other 2D materials with degenerate bands.
Department of Physics, The School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005 (P. R. China). lty@xmu.edu.cn.
Tie-Yu
TY
Lü
Department of Physics, The School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005 (P. R. China).
Jin-Cheng
JC
Zheng
Department of Physics, The School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005 (P. R. China).
Yufeng
Y
Zhang
deformation potential method; degenerate valence bands; density functional calculations; graphane; mobility