KIP publications

 
year 2015
author(s) E. Nicklas, M. Karl, M. Höfer, A. Johnson, W. Muessel, H. Strobel, J. Tomkovič, T. Gasenzer and M. K. Oberthaler
title Observation of Scaling in the Dynamics of a Strongly Quenched Quantum Gas
KIP-Nummer HD-KIP 15-92
KIP-Gruppe(n) F17,F20,P2
document type Paper
Keywords Observation Scaling Quenches Quantum Gas
source PHYSICAL REVIEW LETTERS, 115, 245301, 2015, arXiv:1509.02173
doi 10.1103/PhysRevLett.115.245301
Abstract (en)

We report on the experimental observation of scaling in the time evolution following a sudden quench into the vicinity of a quantum critical point. The experimental system, a two-component Bose gas with coherent exchange between the constituents, allows for the necessary high level of control of parameters as well as the access to time-resolved spatial correlation functions. The theoretical analysis reveals that when quenching the system close to the critical point, the energy introduced by the quench leads to a short-time evolution exhibiting crossover reminiscent of the finite-temperature critical properties in the system’s universality class. Observing the time evolution after a quench represents a paradigm shift in accessing and probing experimentally universal properties close to a quantum critical point and allows in a new way benchmarking of quantum many-body theory with experiments.

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