Quantum Fluctuations, Temperature and Detuning Effects in Solid-Light Systems

Abstract

The superfluid to Mott insulator transition in cavity polariton arrays is analyzed using the variational cluster approach, taking into account quantum fluctuations exactly on finite length scales. Phase diagrams in one and two dimensions exhibit important non-mean-field features. Single-particle excitation spectra in the Mott phase are dominated by particle and hole bands separated by a Mott gap. In contrast to Bose-Hubbard models, detuning allows for changing the nature of the bosonic particles from quasi-localized excitons to polaritons to weakly interacting photons. The Mott state with density one exists up to temperatures $T/g\gtrsim 0.03$, implying experimentally accessible temperatures for realistic cavity couplings $g$.

4 pages, 4 figures, to appear in Phys. Rev. Letters

References in corpus (7)

• Charge insensitive qubit design derived from the Cooper pair box
• Quantum phase transitions of light
• Variational cluster approach to correlated electron systems in low dimensions
• Mott-insulating and glassy phases of polaritons in 1D arrays of coupled cavities
• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Boson Mott insulators at finite temperatures
• Migration of bosonic particles across a Mott insulator to superfluid phase interface

Cited by in corpus (5)

• Quantum Many-Body Phenomena in Coupled Cavity Arrays
• Superfluid-Mott Insulator Transition of Light in the Jaynes-Cummings Lattice
• Strong coupling theory for the Jaynes-Cummings-Hubbard model
• Excitation spectra of strongly correlated lattice bosons and polaritons
• Photon and polariton fluctuations in arrays of QED-cavities