Mobile impurities and Greens function measurements in strongly correlated atoms: advances through strong numerics
by
Adrian Kantian(Geneva)
→
Europe/Stockholm
Nordita West (122:026)
Nordita West (122:026)
Description
Advances in ultracold-gas physics are enabling experiments involving
the direct manipulation and observation of single- or few-atom mobile impurities [1,2]
within a many-body quantum system, a topic of longstanding interest for condensed matter
theory, where it is related to studies of e.g. conductivity and the X-ray edge problem.
In light of these developments we study the dynamics of a single distinguishable mobile impurity in 1D quantum liquids,
combining DMRG numerics with analytical techniques. We show that the recently described subdiffusive
regime of impurity motion [3] actually constitutes universal behaviour, one that is fundamentally
different from the naively expected quasiparticle dynamics [4]. This work is extended to the important issue
of measuring time-dependent Greens-functions and higher-order correlators in-situ for strongly correlated
atoms in optical lattices [5].
[1] PRA 85, 023623 (2012)
[2[ Nature Physics 9, 235 (2013)
[3] PRL 99, 240404 (2007); PRL 103, 110401 (2009)
[4[ PRL 113, 070601 (2014)
[5[ PRL 111, 147205 (2013)
