CQD Special Seminar

23. January 2019 12:00

Seminarraum, Institut für Theoretische Physik, Philosophenweg 19

Quasiparticle origin of dynamical quantum phase transitions

Dr. Jad Halimeh
MPIPKS Dresden and TU München


We consider one- and two-dimensional Ising models with varying interaction ranges. Using matrix product state techniques, we study the  dynamics of these systems and show a direct connection between the type of lowest-energy quasiparticles in the spectrum of the quench  Hamiltonian and the type of nonanalyticities occuring in the Loschmidt return rate, a dynamical analog of the free energy. Our results also  show a clear connection between the type of nonanalyticities and the phase of the long-time steady state in addition to how the order parameter decays at intermediate times. In particular, we discuss anomalous nonanalyticities that occur with no underlying local signature in the order parameter dynamics, unlike the traditional regular nonanalyticities that always correspond to zero crossings of the order parameter. Moreover, we demonstrate how dynamical quantum phase transitions can be used to extract the equilibrium physics of the model from short-time dynamics.

 

up

23. Juli 2025 16:30 Uhr

Physikalisches Institut, INF 226, K 1-3 (Golden Box)

tba

Zoran Hadzibabic

 PreTalk: Manon Ballu & Karthik Chandrashekara: Structural transition from triangular to stripe supersolids

contact
Prof. Dr. M. Weidemüller
Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg
 
06221-54 19470
Ferman Alkasari