TY - JOUR
T1 - Bose-Glass Phases of Ultracold Atoms due to Cavity Backaction
JF - Physical Review Letters
Y1 - 2013
A1 - Hessam Habibian
A1 - AndrĂ© Winter
A1 - Paganelli, Simone
A1 - Heiko Rieger
A1 - Giovanna Morigi
AB - We determine the quantum ground-state properties of ultracold bosonic atoms interacting with the mode of a high-finesse resonator. The atoms are confined by an external optical lattice, whose period is incommensurate with the cavity mode wavelength, and are driven by a transverse laser, which is resonant with the cavity mode. While for pointlike atoms photon scattering into the cavity is suppressed, for sufficiently strong lasers quantum fluctuations can support the buildup of an intracavity field, which in turn amplifies quantum fluctuations. The dynamics is described by a Bose-Hubbard model where the coefficients due to the cavity field depend on the atomic density at all lattice sites. Quantum Monte Carlo simulations and mean-field calculations show that, for large parameter regions, cavity backaction forces the atoms into clusters with a checkerboard density distribution. Here, the ground state lacks superfluidity and possesses finite compressibility, typical of a Bose glass. This system constitutes a novel setting where quantum fluctuations give rise to effects usually associated with disorder.
VL - 110
UR - http://prl.aps.org/abstract/PRL/v110/i7/e075304
IS - 7
JO - Phys. Rev. Lett.
ER -