ELFT HÍRADÓ

[Szeminárium koordinátor <szfi-seminar AT wigner.mta.hu>]

WIGNER SZFI Seminar

Quantum relaxation and metastability of lattice bosons with cavity-induced long-range interactions

Iglói Ferenc
Wigner RCP SZFI

Tuesday, 12 March 2019 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference Room

The coupling of cold atoms to the radiation field within a high-finesse optical resonator, an optical cavity, induces long-range interactions which can compete with an underlying optical lattice. The interplay between short- and long-range interactions gives rise to new phases of matter, including supersolidity and density waves, and interesting quantum dynamics.

In this talk it is shown that for hard-core bosons in one dimension the ground state phase diagram and the quantum relaxation after sudden quenches can be calculated exactly in the thermodynamic limit. Remanent density-wave order is observed for quenches from a density-wave ground state into the superfluid phase below a dynamical transition line. After sufficiently strong superfluid to density wave quenches beyond a static metastability line density-wave order emerges on top of remanent superfluid order, giving rise to a dynamically generated supersolid state. Our method to handle infinite- and short-range interactions in the infinite system size limit opens a way to solve exactly other Hamiltonians with infinite- and short range interactions as well.

[1] B. Blass, H. Rieger, G. Roósz and F. Iglói, Phys. Rev. Lett. 121, 095301 (2018)
[2] F. Iglói, B. Blass, G. Roósz and H. Rieger, Phys. Rev. B 98, 184415 (2018)

 

Everyone is welcome to attend.

János Asbóth
szfi-seminar AT wigner.mta.hu