ELFT HÍRADÓ

[tcsaba <tcsaba AT eik.bme.hu>]

                 M E G H Í V Ó - I N V I T A T I O N

    Seminar Series of the Department of Theoretical Physics at the
           Budapest University of Technology and Economics


                          Gergely Szirmai
               (Wigner Research Centre for Physics)


          Quantum Magnetism with four component fermions


We investigate magnetic properties of strongly interacting four 
component spin-3/2 ultracold fermionic atoms in the Mott insulator limit 
with one particle per site in an optical lattice. In this limit, atomic 
tunneling is virtual, and only the atomic spins can exchange. We find a 
competition between symmetry-breaking and liquidlike disordered phases. 
Particularly interesting are valence bond states with bond centered 
magnetizations, situated between the ferromagnetic and conventional 
valence bond phases. In the framework of a mean-field theory, we 
calculate the phase diagram and identify an experimentally relevant 
parameter region where a homogeneous SU(4) symmetric 
Affleck-Kennedy-Lieb-Tasaki–like valence bond state is present.


Időpont: 2017. március 3. péntek, 10:15
Helyszín: BME Fizikai Intézet, Elméleti Fizika Tanszék,
Budafoki út 8. F-épület, III lépcsőház, szemináriumi szoba