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Abstract
The ground state energy of a coupled system of a quantum tunneling state with phonons is investegated by a variational approach. We find that the ground state of the system may be described by two variation states-displaced state and displaced-squeezed state, and the transition of the stable ground state from displaced state to displaced-squeezed state will occur as coupling strength increases. The phase diagram of the transition is also given.
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SHI YUN-LONG²,

NIE YI-HANG²,

CHEN HONG¹,

WU XIANG¹
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[15]	XU ZONG-RONG, GAO YAN-LIN.. Acta Physica Sinica, 1995, 44(1): 24-28.doi:10.7498/aps.44.24
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[19]	WANG ZHENG-XING.AN APPROXIMATE HAMILTONIAN OF SUPERCONDUCTOR TUNNELING SYSTEM TREATED BY VARIATIONAL METHOD. Acta Physica Sinica, 1979, 28(5): 48-58.doi:10.7498/aps.28.48
[20]	.. Acta Physica Sinica, 1965, 21(12): 2040-2041.doi:10.7498/aps.21.2040

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Vol. 41, Issue 9 - 1992-05-05

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