487 citations · 2.1k across the 19 of their papers we have counts for
19 papers
Observation of a dynamical topological phase transition
Nick Fläschner, Dominik Vogel, Matthias Tarnowski +7
Phase transitions are a fundamental concept in science describing diverse phenomena ranging from, e.g., the freezing of water to Bose-Einstein condensation. While the concept is we…
Notes on the Cluster Gutzwiller Method: Inhomogeneous Lattices, Excitations, and Cluster Time Evolution
Dirk-Sören Lühmann
Several perspectives of the cluster Gutzwiller method are briefly discussed. I show that the cluster mean-field method can be used for large inhomogeneous lattices, for computing l…
Symmetry-broken momentum distributions induced by matter-wave diffraction during time-of-flight expansion of ultracold atoms
Malte Weinberg, Ole Jürgensen, Christoph Ölschläger +3
We study several effects which lead to symmetry-broken momentum distributions of quantum gases released from optical lattices. In particular, we demonstrate that interaction within…
Experimental reconstruction of the Berry curvature in a topological Bloch band
N. Fläschner, B. S. Rem, M. Tarnowski +4
Topological properties lie at the heart of many fascinating phenomena in solid state systems such as quantum Hall systems or Chern insulators. The topology can be captured by the d…
Emulating Molecular Orbitals and Electronic Dynamics with Ultracold Atoms
Dirk-Sören Lühmann, Christof Weitenberg, Klaus Sengstock
In recent years, ultracold atoms in optical lattices have proven their great value as quantum simulators for studying strongly correlated phases and complex phenomena in solid-stat…
Twisted complex superfluids in optical lattices
Ole Jürgensen, Klaus Sengstock, Dirk-Sören Lühmann
We show that correlated pair tunneling drives a phase transition to a twisted superfluid with a complex order parameter. This unconventional superfluid phase spontaneously breaks t…
Beyond mean-field study of a binary bosonic mixture in a state-dependent honeycomb lattice
Lushuai Cao, Sven Krönke, Jan Stockhofe +4
We investigate a binary mixture of bosonic atoms loaded into a state-dependent honeycomb lattice. For this system, the emergence of a so-called twisted-superfluid ground state was…
Observation of Density-Induced Tunneling
Ole Jürgensen, Florian Meinert, Manfred J. Mark +2
We study the dynamics of bosonic atoms in a tilted one-dimensional optical lattice and report on the first direct observation of density-induced tunneling. We show that the interac…
Non-standard Hubbard models in optical lattices: a review
Omjyoti Dutta, Mariusz Gajda, Philipp Hauke +5
Originally, the Hubbard model has been derived for describing the behaviour of strongly-correlated electrons in solids. However, since over a decade now, variations of it are also…
Dimerized Mott insulators in hexagonal optical lattices
Ole Jürgensen, Dirk-Sören Lühmann
We study bosonic atoms in optical honeycomb lattices with anisotropic tunneling and find dimerized Mott insulator phases with fractional filling. These incompressible insulating ph…
Quantum phases in tunable state-dependent hexagonal optical lattices
Dirk-Sören Lühmann, Ole Jürgensen, Malte Weinberg +3
We study the ground-state properties of ultracold bosonic atoms in a state-dependent graphene-like honeycomb optical lattice, where the degeneracy between the two triangular sublat…
Large-Amplitude Superexchange of High-Spin Fermions in Optical Lattices
Ole Jürgensen, Jannes Heinze, Dirk-Sören Lühmann
We show that fermionic high-spin systems with spin-changing collisions allow to monitor superexchange processes in optical superlattices with large amplitudes and strong spin fluct…
Density-induced processes in quantum gas mixtures in optical lattices
Ole Jürgensen, Klaus Sengstock, Dirk-Sören Lühmann
We show that off-site processes and multi-orbital physics have a crucial impact on the phase diagram of quantum gas mixtures in optical lattices. In particular, we discuss Bose-Fer…
Coherent multi-flavour spin dynamics in a fermionic quantum gas
Jasper Simon Krauser, Jannes Heinze, Nick Fläschner +3
Microscopic spin interaction processes are fundamental for global static and dynamical magnetic properties of many-body systems. Quantum gases as pure and well isolated systems off…
Multi-orbital and density-induced tunneling of bosons in optical lattices
D. -S. Lühmann, O. Jürgensen, K. Sengstock
We show that multi-orbital and density-induced tunneling have a significant impact on the phase diagram of bosonic atoms in optical lattices. Off-site interactions lead to density-…
Multi-band spectroscopy of ultracold fermions: Observation of reduced tunneling in attractive Bose-Fermi mixtures
J. Heinze, S. Götze, J. S. Krauser +5
We perform a detailed experimental study of the band excitations and tunneling properties of ultracold fermions in optical lattices. Employing a novel multi-band spectroscopy for f…
Quantum phase transition to unconventional multi-orbital superfluidity in optical lattices
Parvis Soltan-Panahi, Dirk-Sören Lühmann, Julian Struck +2
Orbital physics plays a significant role for a vast number of important phenomena in complex condensed matter systems such as high-T superconductivity and unconventional magnet…
Multi-Orbital Quantum Phase Diffusion
Sebastian Will, Thorsten Best, Ulrich Schneider +3
The collapses and revivals of a coherent matter wave field of interacting particles can serve as a sensitive interferometric probe of the interactions and the number statistics of…
Momentum-Resolved Bragg Spectroscopy in Optical Lattices
P. T. Ernst, S. Götze, J. S. Krauser +4
Strongly correlated many-body systems show various exciting phenomena in condensed matter physics such as high-temperature superconductivity and colossal magnetoresistance. Recentl…