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
      Seminar of the Statistical Field Theory Research Group

                        Mario Collura
                   (University of Oxford)

       Non-equilibrium transport in the XXZ spin-1/2 chain


 I will consider the recent developments in the non-equilibrium 
time-evolution of interacting integrable models, thus focusing on the 
unitary dynamics induced by joining two XXZ spin-1/2 chains with 
different global properties. Through dephasing, at late times, the state 
becomes locally equivalent to a stationary state which explicitly 
depends on position and time. A kinetic theory of elementary excitations 
has been proposed to derive a continuity equation which fully 
characterizes the thermodynamics of the model. The system is prepared in 
the gapless phase and in different initial conditions: (1) at different 
temperatures, (2) in the ground state of two different models, and (3) 
in the "domain wall" state. Excellent agreement between theoretical 
predictions and numerical simulations, based on iTEBD, has been found. 
As a corollary, an exact expression for the expectation values of the 
charge currents in a generic stationary state has been unveiled.

Időpont: 2017. június 13. kedd, 14:15
Helyszín: BME Fizikai Intézet, Elméleti Fizika Tanszék,
Budafoki út 8. F-épület, III lépcsőház, szemináriumi szoba