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31 results on '"Reimann, S.M."'

1. Spin-chain model for strongly interacting one-dimensional Bose-Fermi mixtures

Author

Deuretzbacher, Frank, Becker, D., Bjerlin, J., Reimann, S.M., Santos, Luis, Deuretzbacher, Frank, Becker, D., Bjerlin, J., Reimann, S.M., and Santos, Luis

Abstract

Strongly interacting one-dimensional (1D) Bose-Fermi mixtures form a tunable XXZ spin chain. Within the spin-chain model developed here, all properties of these systems can be calculated from states representing the ordering of the bosons and fermions within the atom chain and from the ground-state wave function of spinless noninteracting fermions. We validate the model by means of an exact diagonalization of the full few-body Hamiltonian in the strongly interacting regime. Using the model, we explore the phase diagram of the atom chain as a function of the boson-boson (BB) and boson-fermion (BF) interaction strengths and calculate the densities, momentum distributions, and trap-level occupancies for up to 17 particles. In particular, we find antiferromagnetic (AFM) and ferromagnetic (FM) order and a demixing of the bosons and fermions in certain interaction regimes. We find, however, no demixing for equally strong BB and BF interactions, in agreement with earlier calculations that combined the Bethe ansatz with a local-density approximation. © 2017 American Physical Society.

Published
2017

2. Antiferromagnetic heisenberg spin chain of a few cold atoms in a one-dimensional trap

Author

Murmann, S., Deuretzbacher, Frank, Zürn, G., Bjerlin, J., Reimann, S.M., Santos, Luis, Lompe, T., Jochim, S., Murmann, S., Deuretzbacher, Frank, Zürn, G., Bjerlin, J., Reimann, S.M., Santos, Luis, Lompe, T., and Jochim, S.

Abstract

We report on the deterministic preparation of antiferromagnetic Heisenberg spin chains consisting of up to four fermionic atoms in a one-dimensional trap. These chains are stabilized by strong repulsive interactions between the two spin components without the need for an external periodic potential. We independently characterize the spin configuration of the chains by measuring the spin orientation of the outermost particle in the trap and by projecting the spatial wave function of one spin component on single-particle trap levels. Our results are in good agreement with a spin-chain model for fermionized particles and with numerically exact diagonalizations of the full few-fermion system. © 2015 American Physical Society.

Published
2015

3. Quantum magnetism without lattices in strongly interacting one-dimensional spinor gases

Author

Deuretzbacher, Frank, Becker, D., Bjerlin, J., Reimann, S.M., Santos, Luis, Deuretzbacher, Frank, Becker, D., Bjerlin, J., Reimann, S.M., and Santos, Luis

Abstract

We show that strongly interacting multicomponent gases in one dimension realize an effective spin chain, offering an alternative simple scenario for the study of one-dimensional (1D) quantum magnetism in cold gases in the absence of an optical lattice. The spin-chain model allows for an intuitive understanding of recent experiments and for a simple calculation of relevant observables. We analyze the adiabatic preparation of antiferromagnetic and ferromagnetic ground states, and show that many-body spin states may be efficiently probed in tunneling experiments. The spin-chain model is valid for more than two components, opening the possibility of realizing SU(N) quantum magnetism in strongly interacting 1D alkaline-earth-metal or ytterbium Fermi gases. © 2014 American Physical Society.

Published
2014

5. Self-bound many-body states of quasi-one-dimensional dipolar Fermi gases: Exploiting Bose-Fermi mappings for generalized contact interactions

Author

Deuretzbacher, Frank, Bruun, G.M., Pethick, C.J., Jona-Lasinio, Mattia, Reimann, S.M., Santos, Luis, Deuretzbacher, Frank, Bruun, G.M., Pethick, C.J., Jona-Lasinio, Mattia, Reimann, S.M., and Santos, Luis

Abstract

Using a combination of results from exact mappings and from mean-field theory we explore the phase diagram of quasi-one-dimensional systems of identical fermions with attractive dipolar interactions. We demonstrate that at low density these systems provide a realization of a single-component one-dimensional Fermi gas with a generalized contact interaction. Using an exact duality between one-dimensional Fermi and Bose gases, we show that when the dipole moment is strong enough, bound many-body states exist, and we calculate the critical coupling strength for the emergence of these states. At higher densities, the Hartree-Fock approximation is accurate, and by combining the two approaches we determine the structure of the phase diagram. The many-body bound states should be accessible in future experiments with ultracold polar molecules. © 2013 American Physical Society.

Published
2013

8. Ground-state properties of few dipolar bosons in a quasi-one-dimensional harmonic trap

Author

Deuretzbacher, Frank, Cremon, J.C., Reimann, S.M., Deuretzbacher, Frank, Cremon, J.C., and Reimann, S.M.

Abstract

We study the ground state of few bosons with repulsive dipole-dipole interaction in a quasi-one-dimensional harmonic trap by means of the exact diagonalization method. Up to three interaction regimes are found, depending on the strength of the dipolar interaction and the ratio of transverse to axial oscillator lengths: a regime where the dipolar Bose gas resembles a system of weakly ?-interacting bosons, a second regime where the bosons are fermionized, and a third regime where the bosons form a Wigner crystal. In the first two regimes, the dipole-dipole potential can be replaced by a ? potential. In the crystalline state, the overlap between the localized wave packets is strongly reduced and all the properties of the boson system equal those of its fermionic counterpart. The transition from the Tonks-Girardeau gas to the solidlike state is accompanied by a rapid increase of the interaction energy and a considerable change of the momentum distribution, which we trace back to the different short-range correlations in the two interaction regimes. © 2010 The American Physical Society.

Published
2010

9. Giant vortices in rotating electron droplets

Author

Räsänen, E. (author), Saarikoski, H. (author), Yu, Y. (author), Harju, A. (author), Puska, M.J. (author), Reimann, S.M. (author), Räsänen, E. (author), Saarikoski, H. (author), Yu, Y. (author), Harju, A. (author), Puska, M.J. (author), and Reimann, S.M. (author)

Abstract

Applied Sciences

Published
2006

10. Giant vortices in rotating electron droplets

Author

Räsänen, E. (author), Saarikoski, H. (author), Yu, Y. (author), Harju, A. (author), Puska, M.J. (author), Reimann, S.M. (author), Räsänen, E. (author), Saarikoski, H. (author), Yu, Y. (author), Harju, A. (author), Puska, M.J. (author), and Reimann, S.M. (author)

Abstract

Applied Sciences

Published
2006

26. Magic triangular and tetrahedral clusters

Author

Reimann, S.M., Koskinen, M., Häkkinen, H., Lindelof, P.E., Manninen, M., Reimann, S.M., Koskinen, M., Häkkinen, H., Lindelof, P.E., and Manninen, M.

Published
1997

29. Magic triangular and tetrahedral clusters

Author

Reimann, S.M., Koskinen, M., Häkkinen, H., Lindelof, P.E., Manninen, M., Reimann, S.M., Koskinen, M., Häkkinen, H., Lindelof, P.E., and Manninen, M.

Published
1997

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