Phase diagram of a QED-cavity array coupled via a N-type level scheme

2015/02/20 by Jiasen Jin, Rosario Fazio, Davide Rossini
Computer Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Coupling (piping) #Density matrix renormalization group #Materials science #Phase (matter) #Phase diagram #Photon #Physics #Polariton #Quantum #Quantum Information and Cryptography #Quantum electrodynamics #Quantum mechanics #Renormalization #Strong Light-Matter Interactions #Superfluidity #quant-ph

paper · pdf · doi:10.1140/epjqt/s40507-015-0018-0

12 pages, 6 figures; EPJ Quantum Technology 2015, 2:5

openalex publication_date 2015/02/20 · arxiv created 2015/03/11 · arxiv updated 2015/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the zero-temperature phase diagram of a one-dimensional array of QED cavities where, besides the single-photon hopping, an additional coupling between neighboring cavities is mediated by an N -type four-level system. By varying the relative strength of the various couplings, the array is shown to exhibit a variety of quantum phases including a polaritonic Mott insulator, a density-wave and a superfluid phase. Our results have been obtained by means of numerical density-matrix renormalization group calculations. The phase diagram was obtained by analyzing the energy gaps for the polaritons, as well as through a study of two-point correlation functions.

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