中国物理B ›› 1999, Vol. 8 ›› Issue (8): 598-606.doi: 10.1088/1004-423X/8/8/007

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THE PROPERTIES OF THE GROUND STATE OF THE NONADIABATICALLY COUPLED ELECTRON-PHONON SYSTEMS WITH CORRELATED DISPLACEMENT AND SQUEEZING

李萍1, 庞小峰2   

  1. (1)Institute of Atomic and Molecular Physics, Sichuan University,Chengdu 610065,China; (2)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;Institute of Atomic and Molecular Physics, Sichuan
  • 收稿日期:1999-01-03 修回日期:1999-03-16 出版日期:1999-08-15 发布日期:1999-08-20
  • 基金资助:
    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.

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   

  1. 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
  • Received:1999-01-03 Revised:1999-03-16 Online:1999-08-15 Published:1999-08-20
  • Supported by:
    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.

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摘要： 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.

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.

中图分类号:  (Polarons and electron-phonon interactions)

  • 71.38.-k
63.20.D- (Phonon states and bands, normal modes, and phonon dispersion) 63.20.K- (Phonon interactions)