TWO-DIMENSIONAL LOCALIZED VIBRATIONAL MODES AROUND A POLARON WITH THE NEXT-NEAREST-NEIGHBOR HOPPING INTERACTIONS
LI ZHAN-JIE (李占杰)a, YAO KAI-LUN (姚凯伦)b
a International Center of Materials Physics, Academia Sinica, Shenyang 110015, China; b Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract We have calculated the vibrational modes around a polaron to test the effects of the next-nearest-neighbor hopping interactions on the localized medes within a framework of the two-dimensional mode. The results show that: (1) For a negative polaron, eleven localized modes have been found, compared with ten modes obtained on a previous work without non-nearest neighbor hopping. (2) For a positive polaron, two additional localized modes occur. (3) The localization of localized modes are strengthened and their frequencies move after turning on the next-nearest-neighbor hopping interactions.
Received: 15 July 1994
Revised: 14 January 1995
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China.
Cite this article:
LI ZHAN-JIE (李占杰), YAO KAI-LUN (姚凯伦) TWO-DIMENSIONAL LOCALIZED VIBRATIONAL MODES AROUND A POLARON WITH THE NEXT-NEAREST-NEIGHBOR HOPPING INTERACTIONS 1995 Acta Physica Sinica (Overseas Edition) 4 500
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