Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 39: Ultracold atoms, ions and BEC IV (with A)
Q 39.7: Talk
Thursday, March 20, 2014, 12:00–12:15, BEBEL E34
Excited state quantum phase transition in the kicked top — •Victor M. Bastidas1, Pedro Perez-Fernandez2, Malte Vogl1, and Tobias Brandes1 — 1Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany — 2Departamento de Fisica Aplicada III, Escuela Superior de Ingenieros, Universidad de Sevilla, Camino de los Descubrimientos s/n, ES-41092 Sevilla, Spain
Our aim in this talk is to describe the excited state quantum phase transition in the quasienergy spectrum of the kicked top. Using a semiclassical approach, we analytically obtain a logarithmic divergence in the density of states, which is a hallmark of a continuous excited state quantum phase transition. We propose a protocol to observe signatures of the phase transition close to the critical quasienergy.