ELFT HÍRADÓ

[Szilard SZALAY <szalay AT phy.bme.hu>]

Seminar of the
Wigner SzFI Strongly Correlated Systems "Lendület" Research Group


    Cavity-induced artificial gauge field in a Bose-Hubbard ladder

Catalin-Mihai Halati
Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn
(host: Örs Legeza)

Tuesday, 29 May 2018 14:00, KFKI Campus, Bldg. 1, 2nd floor, Conference Room

We consider theoretically ultracold interacting bosonic atoms confined 
to quasi-one-dimensional ladder structures formed by optical lattices 
and coupled to the field of an optical cavity. The atoms can collect a 
spatial phase imprint during a cavity-assisted tunneling along a rung 
via Raman transitions employing a cavity mode and a transverse running 
wave pump beam. By adiabatic elimination of the cavity field we obtain 
an effective Hamiltonian for the bosonic atoms, with a self-consistency 
condition. Using the numerical density matrix renormalization group 
method, we obtain a rich steady state diagram of self-organized steady 
states. Transitions between superfluid to Mott-insulating states occur, 
on top of which we can have Meissner, vortex liquid, and vortex lattice 
phases. Also a state that explicitly breaks the symmetry between the two 
legs of the ladder, namely the biased-ladder phase is dynamically 
stabilized.

C.-M. Halati, A. Sheikhan, and C. Kollath, Phys. Rev. A 96, 063621.



Everyone is welcome to attend.

-- Szilárd Szalay. --