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Formation of Large Bipolarons |
CHEN Qing-hu;REN Yu-hang;JIAO Zheng-kuan;ZHANG Qi-rui |
Department of Physics, Zhejiang University, Hangzhou 310027 |
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Cite this article: |
CHEN Qing-hu, REN Yu-hang, JIAO Zheng-kuan et al 1997 Chin. Phys. Lett. 14 601-604 |
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Abstract A variational approach is presented to calculate the ground-state energy of large bipolarons in two and three dimensions. The values of the critical coupling constant αc above which the bipolaron is stable and the critical ratio of dielectric constants ηc below which the bipolaron is stable are approximately evaluated. It is found that the stability region of bipolarons in the (l/α, η )-plane becomes larger with decreasing dimensionality.
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Keywords:
71.38.+i
63.20.Kr
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Published: 01 August 1997
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