THE PROPERTIES OF THE GROUND STATE OF THE NONADIABATICALLY COUPLED ELECTRON-PHONON SYSTEMS WITH CORRELATED DISPLACEMENT AND SQUEEZING
PANG XIAO-FENG (庞小峰)ab, LI PING (李萍)b
a Institute of High-energy Physics,University of Electronic Science and Technology of China, Chengdu 610054,China; International Centre for Material Physics, Chinese Academy of Science,Shenyang 110015,China; b Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
Abstract Eeffcts of the nonadiabatic phonon fluctuations on the ground state of coupled onedimensional electron-phonon systems with high and low electron-densities were investigated by a new ansatz including correlated interaction of the displacement and squeezing. The correlated effect resulted in noticeable reduction of ground state energy of the systems, and obvious increases of binding energy of the polarons occurred. Thus,the stabilities of the polaron and of the systems were significantly enhanced,exactly steady ground state of the Holstein model, then,was obtained by the new ansatz for the coupled electron-phonon systems. In general,the new ansatz were found to be very relevant for the strong coupling and large squeezing cases in nonadiabatically coupled electron-photon systems.
Received: 03 January 1999
Revised: 16 March 1999
Accepted manuscript online:
Fund: Project supported by the State Science Technology Commission of China(Grant No.SSTC-96-079),also by the Especial Fund of the State Science and Technology Commission of China.
Cite this article:
PANG XIAO-FENG (庞小峰), LI PING (李萍) THE PROPERTIES OF THE GROUND STATE OF THE NONADIABATICALLY COUPLED ELECTRON-PHONON SYSTEMS WITH CORRELATED DISPLACEMENT AND SQUEEZING 1999 Acta Physica Sinica (Overseas Edition) 8 598
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