科研之友
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摘要
We study the Husimi distribution of the ground state in the Dicke model of field-matter interactions to visualize the quantum phase transition, from normal to superradiant, in phase space. We follow an exact numerical and variational analysis, without making use of the usual Holstein-Primakoff approximation. We find that the Wehrl entropy of the Husimi distribution provides an indication of the sharp changes in symmetry through the critical point. Additionally, we note that the zeros of the Husimi distribution characterize the Dicke model quantum phase transition.
- 出版日期2013-3
