184 citations · 2.1k across the 37 of their papers we have counts for
12 papers · 1 filter
High temperature pairing in a strongly interacting two-dimensional Fermi gas
Puneet A. Murthy, Mathias Neidig, Ralf Klemt +7
We observe many-body pairing in a two-dimensional gas of ultracold fermionic atoms at temperatures far above the critical temperature for superfluidity. For this, we use spatially…
Quasi-long-range order in trapped two-dimensional Bose gases
Igor Boettcher, Markus Holzmann
We study the fate of algebraic decay of correlations in a harmonically trapped two-dimensional degenerate Bose gas. The analysis is inspired by recent experiments on ultracold atom…
Dimensional crossover of nonrelativistic bosons
Soeren Lammers, Igor Boettcher, Christof Wetterich
We investigate how confining a transverse spatial dimension influences the few- and many-body properties of non-relativistic bosons with pointlike interactions. Our main focus is o…
Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region
I. Boettcher, L. Bayha, D. Kedar +7
We report the experimental measurement of the equation of state of a two-dimensional Fermi gas with attractive s-wave interactions throughout the crossover from a weakly coupled Fe…
Observation of pair condensation in the quasi-2D BEC-BCS crossover
M. G. Ries, A. N. Wenz, G. Zürn +7
The condensation of fermion pairs lies at the heart of superfluidity. However, for strongly correlated systems with reduced dimensionality the mechanisms of pairing and condensatio…
Sarma phase in relativistic and non-relativistic systems
I. Boettcher, T. K. Herbst, J. M. Pawlowski +3
We investigate the stability of the Sarma phase in two-component fermion systems in three spatial dimensions. For this purpose we compare strongly-correlated systems with either re…
Phase structure of spin-imbalanced unitary Fermi gases
I. Boettcher, J. Braun, T. K. Herbst +3
We investigate the phase structure of spin-imbalanced unitary Fermi gases beyond mean-field theory by means of the Functional Renormalization Group. In this approach, quantum and t…
Critical temperature and superfluid gap of the Unitary Fermi Gas from Functional Renormalization
Igor Boettcher, Jan M. Pawlowski, Christof Wetterich
We investigate the superfluid transition of the Unitary Fermi Gas by means of the Functional Renormalization Group, aiming at quantitative precision. We extract $T_{\rm c}/μ=0.38(2…
Error estimates and specification parameters for functional renormalization
David Schnoerr, Igor Boettcher, Jan M. Pawlowski +1
We present a strategy for estimating the error of truncated functional flow equations. While the basic functional renormalization group equation is exact, approximated solutions by…
Tan contact and universal high momentum behavior of the fermion propagator in the BCS-BEC crossover
Igor Boettcher, Sebastian Diehl, Jan M. Pawlowski +1
We derive the universal high momentum factorization of the fermion self-energy in the BCS-BEC crossover of ultracold atoms using nonperturbative quantum field theoretical methods.…
Ultracold atoms and the Functional Renormalization Group
Igor Boettcher, Jan M. Pawlowski, Sebastian Diehl
We give a self-contained introduction to the physics of ultracold atoms using functional integral techniques. Based on a consideration of the relevant length scales, we derive the…
Hydrodynamic collective modes for cold trapped gases
Igor Boettcher, Stefan Floerchinger, Christof Wetterich
We suggest that collective oscillation frequencies of cold trapped gases can be used to test predictions from quantum many-body physics. Our motivation lies both in rigid experimen…