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Acta Physica Sinica (Overseas Edition), 1998, Vol. 7(8): 598-607    DOI: 10.1088/1004-423X/7/8/007
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

AN EFFECTIVE APPROACH FOR TWO-DIMENSIONAL POLARONS IN AN ASYMMETRIC QUANTUM DOT

Ren Yu-hang (任宇航), Chen Qing-hu (陈庆虎), Jiao Zheng-kuan (焦正宽)
Department of Physics, Zhejiang University, Hangzhou 310027, China.
Abstract  Within the framework of Feynman-Haken path integral theory, we calculate the ground-state energy of two-dimensional polarons in asymmetric quantum dots for arbitrary electron-phonon coupling constants. From a general three-dimensional Hamiltonian, some interesting problems, such as polarons in quasi-one-dimensional quantum wires and quasi-zero-dimensional asymmetric or symmetric quantum dots can be easily discussed only by taking different limit in the whole coupling regime. After the numerical calculation, we find that the relative polaronic correction increases monotonically with the decrease of effective dot size, and it becomes more pronounced with increasing dimension and asymmetry. Moreover, despite the insensitivity of relative polaronic enhancement to the variation of coupling constant at weak coupling, the correction is related to the coupling constant as the latter becomes larger.
Received:  04 January 1998      Revised:  13 March 1998      Accepted manuscript online: 
PACS:  71.38.-k (Polarons and electron-phonon interactions)  
  73.21.La (Quantum dots)  
  63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)  
  73.21.Hb (Quantum wires)  

Cite this article: 

Ren Yu-hang (任宇航), Chen Qing-hu (陈庆虎), Jiao Zheng-kuan (焦正宽) AN EFFECTIVE APPROACH FOR TWO-DIMENSIONAL POLARONS IN AN ASYMMETRIC QUANTUM DOT 1998 Acta Physica Sinica (Overseas Edition) 7 598

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