Quantum phase transition and Berry phase in an extended Dicke model
نویسندگان
چکیده
منابع مشابه
Quantum phase transition in a pseudo-Hermitian Dicke model.
We show that a Dicke-type non-Hermitian Hamiltonian admits entirely real spectra by mapping it to the "dressed Dicke model" through a similarity transformation. We find a positive-definite metric in the Hilbert space of the non-Hermitian Hamiltonian so that the time evolution is unitary and allows a consistent quantum description. We then show that this non-Hermitian Hamiltonian describing nond...
متن کاملEntanglement and quantum phase transition in the extended Hubbard model.
We study quantum entanglement in a one-dimensional correlated fermionic system. Our results show, for the first time, that entanglement can be used to identify quantum phase transitions in fermionic systems.
متن کاملProposed realization of the Dicke-model quantum phase transition in an optical cavity QED system
F. Dimer, B. Estienne, A. S. Parkins,* and H. J. Carmichael Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand Laboratoire de Physique Théorique et Hautes Energies, Université Pierre et Marie Curie, 4 place Jussieu, F-75252 Paris Cedex 05, France Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA Re...
متن کاملTopological quantum phase transition in the extended Kitaev spin model
Xiao-Feng Shi,1,2,3 Yue Yu,4 J. Q. You,1,2,3 and Franco Nori2,3,5 1Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, China 2Advanced Science Institute, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan 3CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan 4Institute of Theo...
متن کاملExploring symmetry breaking at the Dicke quantum phase transition.
We study symmetry breaking at the Dicke quantum phase transition by coupling a motional degree of freedom of a Bose-Einstein condensate to the field of an optical cavity. Using an optical heterodyne detection scheme, we observe symmetry breaking in real time and distinguish the two superradiant phases. We explore the process of symmetry breaking in the presence of a small symmetry-breaking fiel...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The European Physical Journal D
سال: 2020
ISSN: 1434-6060,1434-6079
DOI: 10.1140/epjd/e2020-10332-0