158 citations · 533 across the 23 of their papers we have counts for
23 papers
Measurement-Induced Dynamical Quantum Thermalization
Marvin Lenk, Sayak Biswas, Anna Posazhennikova +1
One of the fundamental problems of quantum statistical physics is how an ideally isolated quantum system can ever reach thermal equilibrium behavior despite the unitary time evolut…
Loop current states and their stability in small fractal lattices of Bose-Einstein condensates
Georg Koch, Anna Posazhennikova
We consider a model of interacting Bose-Einstein condensates on small Sierpinski gaskets. We study eigenstates which are characterised by cyclic supercurrents per each triangular p…
Chaos onset in large rings of Bose-Einstein condensates
Damian Wozniak, Johann Kroha, Anna Posazhennikova
We consider large rings of weakly-coupled Bose-Einstein condensates, analyzing their transition to chaotic dynamics and loss of coherence. Initially, a ring is considered to be in…
Expansion dynamics in two-dimensional Bose-Hubbard lattices: Bose-Einstein condensate and thermal cloud
Mauricio Trujillo-Martinez, Anna Posazhennikova, Johann Kroha
We study the temporal expansion of an ultracold Bose gas in two-dimensional, square optical lattices. The gas is described by the Bose-Hubbard model deep in the superfluid regime,…
Manipulating the Mott lobes: optical lattice bosons coupled to an array of atomic quantum dots
Damian Wozniak, Florian Magnus Dobler, Anna Posazhennikova
We analyze quantum phase transitions in a system of optical lattice bosons coupled to an array of atomic quantum dots, or pseudospins-1/2. The system parallels the Bose-Hubbard mod…
Fluctuation-damping of isolated, oscillating Bose-Einstein condensates
Tim Lappe, Anna Posazhennikova, Johann Kroha
Experiments on the nonequilibrium dynamics of an isolated Bose-Einstein condensate (BEC) in a magnetic double-well trap exhibit a puzzling divergence: While some show dissipation-f…