Dissipation-induced hard-core boson gas in an optical lattice (2009)
García-Ripoll, Juan José, Dürr, Stephan, Syassen, Niels, Bauer, Dominik M., Lettner, Matthias, Rempe, Gerhard, ...
Lieb-Liniger model of a dissipation-induced Tonks-Girardeau gas (2009)
Dürr, Stephan, Garcia-Ripoll, Juan José, Syassen, Niels, Bauer, Dominik M., Lettner, Matthias, Cirac, J. Ignacio, ...
Control of a magnetic Feshbach resonance with laser light (2009)
Bauer, Dominik M., Lettner, Matthias, Vo, Christoph, Rempe, Gerhard, Dürr, Stephan
Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition (2009)
Bauer, Dominik M., Lettner, Matthias, Vo, Christoph, Rempe, Gerhard, Dürr, Stephan
A Dissipative Tonks-Girardeau Gas of Molecules (2009)
Dürr, Stephan, Syassen, Niels, Bauer, Dominik M., Lettner, Matthias, Volz, Thomas, Dietze, Daniel, ...
Strong Dissipation Inhibits Losses and Induces Correlations in Cold Molecular Gases (2008)
Syassen, Nils, Bauer, Dominik M., Lettner, Matthias, Volz, Thomas, Dietze, Daniel, Garcia-Ripoll, Juan J., ...
Atom-Molecule Rabi Oscillations in a Mott Insulator (2007)
Syassen, Niels, Bauer, Dominik M., Lettner, Matthias, Dietze, Daniel, Volz, Thomas, Dürr, Stephan, ...
The Phase of a Bose-Einstein Condensate (2006)
If two Bose-Einstein condensates are prepared independently and then overlapped, a spatial interference pattern is observed. This prompts the question what determines the phase of the fringe pattern,...
Preparation of a quantum state with one molecule at each site of an optical lattice (2006)
Volz, Thomas, Syassen, Niels, Bauer, Dominik M., Hansis, Eberhard, Dürr, Stephan, Rempe, Gerhard
Collisional decay of 87Rb Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard
Collisional decay of Rb87 Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard, Swinburne University Of Technology. Faculty Of Engineering And Industrial Sciences. Centre For Atom Optics And Ultrafast Spectroscopy
We present measurements of the loss-rate coefficients Kam and Kmm caused by inelastic atom-molecule and molecule-molecule collisions. A thermal cloud of atomic Rb87 is prepared in an optical dipole...
Collisional decay of Rb87 Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard
We present measurements of the loss-rate coefficients Kam and Kmm caused by inelastic atom-molecule and molecule-molecule collisions. A thermal cloud of atomic Rb87 is prepared in an optical dipole...
Collisional decay of Rb87 Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard
We present measurements of the loss-rate coefficients Kam and Kmm caused by inelastic atom-molecule and molecule-molecule collisions. A thermal cloud of atomic Rb87 is prepared in an optical dipole...
Collisional decay of Rb87 Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard
We present measurements of the loss-rate coefficients Kam and Kmm caused by inelastic atom-molecule and molecule-molecule collisions. A thermal cloud of atomic Rb87 is prepared in an optical dipole...
Collisional decay of Rb87 Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard
We present measurements of the loss-rate coefficients Kam and Kmm caused by inelastic atom-molecule and molecule-molecule collisions. A thermal cloud of atomic Rb87 is prepared in an optical dipole...
Collisional decay of Rb87 Feshbach molecules at 1005.8 G (2006)
Syassen, Niels, Volz, Thomas, Teichmann, Sven, Dürr, Stephan, Rempe, Gerhard
We present measurements of the loss-rate coefficients Kam and Kmm caused by inelastic atom-molecule and molecule-molecule collisions. A thermal cloud of atomic Rb87 is prepared in an optical dipole...
Dissociation of Feshbach molecules into different partial waves (2005)
Dürr,Stephan, Volz,Thomas, Syassen,Niels, Rempe,Gerhard, Van Kempen,Eric, Kokkelmans,Servaas, ...
UV-filtered overlap fermions (2005)
Dürr, Stephan, Hoelbling, Christian, Wenger, Urs
We discuss the kernel spectrum, locality properties and the axial-vector renormalization constant of UV-filtered overlap fermions. We find that UV-filtered overlap fermions have a better conditioned...
Dissociation of Feshbach Molecules into Different Partial Waves (2005)
Dürr, Stephan, Volz, Thomas, Syassen, Niels, Rempe, Gerhard, Van Kempen, Eric, Kokkelmans, Servaas, ...
Ultracold molecules can be associated from ultracold atoms by ramping the magnetic field through a Feshbach resonance. A reverse ramp dissociates the molecules. Under suitable conditions, more than...
Feshbach spectroscopy of a shape resonance (2005)
Volz,Thomas, Dürr,Stephan, Syassen,Niels, Rempe,Gerhard, Van Kempen,Eric, Kokkelmans,Servaas
Feshbach spectroscopy of a shape resonance (2005)
Volz, Thomas, Dürr, Stephan, Syassen, Niels, Rempe, Gerhard, Van Kempen, Eric, Kokkelmans, Servaas
Dissociation of Feshbach molecules into different partial waves (2005)
Dürr, Stephan, Volz, Thomas, Syassen, Niels, Rempe, Gerhard, Van Kempen, Eric, Kokkelmans, Servaas, ...
Scaling tests with dynamical overlap and rooted staggered fermions (2004)
Dürr, Stephan, Hoelbling, Christian
We present a scaling analysis in the 1-flavor Schwinger model with the full overlap and the rooted staggered determinant. In the latter case the chiral and continuum limit of the scalar condensate do...
Feshbach Spectroscopy of a Shape Resonance (2004)
Volz, Thomas, Dürr, Stephan, Syassen, Niels, Rempe, Gerhard, Van Kempen, Eric, Kokkelmans, Servaas
We present a new spectroscopy technique for studying cold-collision properties. The technique is based on the association and dissociation of ultracold molecules using a magnetically tunable Feshbach...
Gauge action improvement and smearing (2004)
The effect of repeatedly smearing SU(3) gauge configurations is investigated. Six gauge actions (Wilson, Symanzik, Iwasaki, DBW2, Beinlich-Karsch-Laermann, Langfeld; combined with a direct...
A comparative study of overlap and staggered fermions in the Schwinger model (2004)
Dürr, Stephan, Hoelbling, Christian
We investigate the validity of the square rooting procedure of the staggered determinant in the context of the Schwinger model. We find some evidence that at fixed physical quark mass the square root...
Staggered eigenvalue mimicry (2004)
Dürr, Stephan, Hoelbling, Christian, Wenger, Urs
We study the infrared part of the spectrum for UV-filtered staggered Dirac operators and compare them to the overlap counterpart. With sufficient filtering and at small enough lattice spacing the...
Dissociation of ultracold molecules with Feshbach resonances (2004)
Dürr, Stephan, Volz, Thomas, Rempe, Gerhard
Ultracold molecules are associated from an atomic Bose-Einstein condensate by ramping a magnetic field across a Feshbach resonance. The reverse ramp dissociates the molecules. The kinetic energy...
The pion mass in finite volume (2003)
Colangelo, Gilberto, Dürr, Stephan
We determine the relative pion mass shift $M_\pi(L)/M_\pi-1$ due to the finite spatial extent $L$ of the box by means of two-flavor chiral perturbation theory and the one-particle L\"uscher formula....
Staggered versus overlap fermions: a study in the Schwinger model with $N_f=0,1,2$ (2003)
Dürr, Stephan, Hoelbling, Christian
We study the scalar condensate and the topological susceptibility for a continuous range of quark masses in the Schwinger model with $N_f=0,1,2$ dynamical flavors, using both the overlap and the...
Observation of molecules produced from a Bose-Einstein condensate (2003)
Dürr, Stephan, Volz, Thomas, Marte, Andreas, Rempe, Gerhard
Molecules are created from a Bose-Einstein condensate of atomic 87Rb using a Feshbach resonance. A Stern-Gerlach field is applied, in order to spatially separate the molecules from the remaining...
Characterization of elastic scattering near a Feshbach resonance in 87Rb (2003)
Volz,Thomas, Dürr,Stephan, Ernst,Sebastian, Marte,Andreas, Rempe,Gerhard
Characterization of elastic scattering near a Feshbach resonance in rubidium 87 (2003)
Volz, Thomas, Dürr, Stephan, Ernst, Sebastian, Marte, Andreas, Rempe, Gerhard
The s-wave scattering length for elastic collisions between 87Rb atoms in the state |f,m_f>=|1,1> is measured in the vicinity of a Feshbach resonance near 1007 G. Experimentally, the scattering...
Characterization of elastic scattering near a Feshbach resonance in 87Rb (2003)
Volz, Thomas, Dürr, Stephan, Ernst, Sebastian, Marte, Andreas, Rempe, Gerhard
Lattice QCD data versus Chiral Perturbation Theory: the case of $M_\pi$ (2002)
I present a selection of recent lattice data by major collaborations for the pseudo-Goldstone boson masses in full ($N_f=2$) QCD, where the valence quarks are chosen exactly degenerate with the sea...
M_pi^2 versus m_q: comparing CP-PACS and UKQCD data to Chiral Perturbation Theory (2002)
I present a selection of CP-PACS and UKQCD data for the pseudo-Goldstone masses in $N_f=2$ QCD with doubly degenerate quarks. At least the more chiral points should be consistent with Chiral...
Modified iterative versus Laplacian Landau gauge in compact U(1) theory (2002)
Dürr, Stephan, De Forcrand, Philippe
Compact U(1) theory in 4 dimensions is used to compare the modified iterative and the Laplacian fixing to lattice Landau gauge in a controlled setting, since in the Coulomb phase the lattice theory...
Topology and pion correlators -- a study in the N_f=2 Schwinger model (2001)
I readdress the issue whether the topological charge of the gauge background has an influence on a hadronic observable. To this end pion correlators in the Schwinger model with 2 dynamical flavours...
Simple check of the vacuum structure in full QCD lattice simulations (2001)
Given the increasing availability of lattice data for (unquenched) QCD with $N_f=2$, it is worth while to check whether the generated vacuum significantly deviates from the quenched one. I discuss a...
Recent lattice data from CP-PACS, UKQCD, SESAM/TXL and the Pisa group regarding the quark mass dependence of the topological susceptibility in 2-flavour QCD are compared to each other and to...
Study of the Leutwyler-Smilga regimes: Lessons for full QCD simulations (2000)
Some key points out of my recent study of the characteristic features of the small ($x \ll 1$), intermediate ($x \simeq 1$) and large ($x \gg 1$) Leutwyler-Smilga regimes for QCD-type theories in a...
I give a sketch of my recent attempt to test the prediction by Leutwyler and Smilga according to which, for QCD in a finite box with $N_{f} \geq 2$, the combination $x = V \Sigma m$ indicates whether...
The phase transition in the multiflavour Schwinger model (2000)
A summary is given of a quantization of the multiflavour Schwinger model on a finite-temperature cylinder with chirality-breaking boundary conditions at its spatial ends, and it is shown that the...
QCD in a finite box: Numerical test studies in the three Leutwyler-Smilga regimes (2000)
The Leutwyler-Smilga prediction regarding the (ir)relevance of the global topological charge for QCD in a finite box is subject to a test. To this end the lattice version of a suitably chosen...
Topologically Unquenched QCD: Prospects from an explorative study in 2-flavour QED(2) (2000)
The concept of simulating a variant of QCD with sea quarks which interact with the gluon configuration only via global gluonic quantities like $\int F\tilde F dx$ and $\int FF dx$ is tested for the...
Dürr, Stephan, Kambor, Joachim
We present our calculation of the correlator $$ between two external vector-currents with the quantum-numbers of a charged kaon. The renormalized expression to $O(p^6)$ in $SU(3) \times SU(3)$...
Theoretical Aspects of Topologically Unquenched QCD (1999)
I give an outline of my proposal to take the QCD functional determinant in lattice simulations partially into account: The determinant is split into two factors, the factor referring to a standard...
I give a quick summary of my proposal for simulating an improvement on quenched QCD with dynamical fermions which interact with the gluon configuration only via the topological index of the latter....
Dürr, Stephan, Kambor, Joachim
We calculate the correlator between two external vector-currents having the quantum-numbers of a charged kaon. We give the renormalized expression to two loops in standard chiral perturbation theory...
Dürr, Stephan, Sharpe, Stephen R.
The Schwinger model is used to study the artifacts of quenching in a controlled way. The model is solved on a finite-temperature cylinder of circumference $\beta=1/T$ with bag-inspired local boundary...
We consider the N_f-flavour Schwinger Model on a thermal cylinder of circumference $\beta=1/T$ and of finite spatial length $L$. On the boundaries $x^1=0$ and $x^1=L$ the fields are subject to an...
Proposal for Topologically Unquenched QCD (1998)
A proposal is presented for simulating an improvement on quenched QCD with dynamical fermions which interact with the gluon configuration only via the topological index of the latter. Strengths and...
Finite Temperature Schwinger Model with Chirality Breaking Boundary Conditions (1996)
The $N_f$-flavour Schwinger Model on a finite space $0\leq x^1\leq L$ and subject to bag-type boundary-conditions at $x^1=0$ und $x^1=L$ is solved at finite temperature $T=1/\beta$. The boundary...