134 citations · 822 across the 14 of their papers we have counts for
14 papers
System size scaling of topological defect creation in a second-order dynamical quantum phase transition
Michael Uhlmann, Ralf Schützhold, Uwe R. Fischer
We investigate the system size scaling of the net defect number created by a rapid quench in a second-order quantum phase transition from an O(N) symmetric state to a phase of brok…
Time-resolved density correlations as probe of squeezing in toroidal Bose-Einstein condensates
Michael Uhlmann
I study the evolution of mean field and linear quantum fluctuations in a toroidal Bose-Einstein condensate, whose interaction strength is quenched from a finite (repulsive) value t…
O(N) symmetry-breaking quantum quench: Topological defects versus quasiparticles
Michael Uhlmann, Ralf Schützhold, Uwe R. Fischer
We present an analytical derivation of the winding number counting topological defects created by an O(N) symmetry-breaking quantum quench in N spatial dimensions. Our approach is…
Quantum fluctuations in trapped time-dependent Bose-Einstein condensates
Michael Uhlmann
Quantum fluctuations in time-dependent, harmonically-trapped Bose-Einstein condensates are studied within Bogoliubov theory. An eigenmode expansion of the linear field operators pe…
Effect of fluctuations on the superfluid-supersolid phase transition on the lattice
Ralf Schützhold, Michael Uhlmann, Uwe R. Fischer
We derive a controlled expansion into mean field plus fluctuations for the extended Bose-Hubbard model, involving interactions with many neighbors on an arbitrary periodic lattice,…
Bogoliubov theory of quantum correlations in the time-dependent Bose-Hubbard model
Uwe R. Fischer, Ralf Schützhold, Michael Uhlmann
By means of an adapted mean-field expansion for large fillings , we study the evolution of quantum fluctuations in the time-dependent Bose-Hubbard model, starting in the sup…