An effective approach for two-dimensional polarons in an asymmetric quantum dot

作者：Ren YH^*; Chen QH; Jiao ZK

来源：Acta Physica Sinica (Overseas Edition), 1998, 7(8): 598-607.

Within the framework of Feynman-Haken path integral theory, we calculate the groundstate 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.

• 出版日期1998-8
• 单位浙江大学