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On the possibility of self-trapping transition of acoustic polarons in two dimensions
侯俊华 梁希侠
Department of Physics, Inner Mongolia University, Hohhot 010021, China
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文章出处:
《中国物理：英文版》-2007年16卷10期 -3059-3066页
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On the possibility of self-trapping transition of acoustic polarons in two dimensions
Hou Jun-Hua and Liang Xi-Xia（ Department of Physics, Inner Mongolia University, Hohhot 010021, China）
Abstract:
A 2D electron-longitudinal-acoustic-phonon interaction Hamiltonian is derived and used to calculate the groundstate energy of the acoustic polarons in two dimensions. The numerical results for the ground-state energy of the acoustic polarons in two and three dimensions are obtained. The 3D results agree with those obtained by using the Feynman path-integral approach. It is found that the critical coupling constant of the transition from the quasifree state to the self-trapped state in the 2D case is much smaller than in the 3D case for a given cutoff wave-vector. The theory has been used to judge the possibility of the self-trapping for several real materials. The results indicate that the self-trappings of the electrons in AlN and the holes in AlN and GaN are expected to be observed in 2D systems.[著者文摘]
Key words:
acoustic polarons, self trapping, two-dimensional electron-phonon interaction
基金资助:
Project supported by the Doctoral Program Foundation of Institutions of Higher Education China （Grant No 20040126003） and the Natural Science Foundation of Inner Mongol of China （Grant No 200408020101）.
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