Importance of counter-rotating coupling in the superfluid-to-Mott-insulator quantum phase transition of light in the Jaynes-Cummings lattice

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.043819· OSTI ID:22093375

Hang, Zheng ^[1]; Takada, Yasutami ^[2]

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1. Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University (China)
2. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581 (Japan)

The quantum phase transition between Mott insulator and superfluid is studied in the two-dimensional Jaynes-Cummings square lattice in which the counter-rotating coupling (CRC) is included. Both the ground state and the spectra of low-lying excitations are obtained with use of a sophisticated unitary transformation. This CRC is shown not only to induce a long-range interaction between cavities, favoring the long-range superfluid order, but also to break the conservation of local polariton number at each site, leading to the absence of the Mott lobes in the phase diagram, in sharp contrast with the case without the CRC as well as that of the Bose-Hubbard model.

• OSTI ID: 22093375
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
DIELECTRIC MATERIALS
EXCITATION
GROUND STATES
HUBBARD MODEL
INTERACTION RANGE
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
SUPERFLUIDITY
TETRAGONAL LATTICES
TWO-DIMENSIONAL CALCULATIONS
VISIBLE RADIATION