Fakultät für Mathematik und Physik

 

Neueste Zugänge

  • Geipel, Jacob C. (Amsterdam : Elsevier BV, 2017)
    We consider the SU(3)-equivariant dimensional reduction of gauge theories on spaces of the form Md×X1,1with d-dimensional Riemannian manifold Mdand the Aloff–Wallach space X1,1=SU(3)/U(1)en-dowed with its Sasaki–Einstein ...
  • Deuretzbacher, Frank; Becker, D.; Bjerlin, J.; Reimann, S.M.; Santos, Luis (College Park, MD : American Physical Society, 2017)
    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 ...
  • Tegenkamp, Christoph; Wollschläger, Joachim; Pfnür, Herbert; Meyer zu Heringdorf, Frank-J.; Horn-von Hoegen, Michael (College Park, MD : American Physical Society, 2002)
    Using spot profile analysis in low-energy electron diffraction, we have investigated vicinal Ge(100) surfaces, which were miscut by 2.7° and 5.4°, respectively, in [011] direction with respect to the surface normal. Within ...
  • Deuretzbacher, Frank; Becker, D.; Santos, Luis (College Park, MD : American Physical Society, 2016)
    One-dimensional spinor gases with strong δ interaction fermionize and form a spin chain. The spatial degrees of freedom of this atom chain can be described by a mapping to spinless noninteracting fermions and the spin ...
  • Deuretzbacher, Frank; Becker, D.; Bjerlin, J.; Reimann, S.M.; Santos, Luis (College Park, MD : American Physical Society, 2014)
    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 ...
  • Pedersen, P.L.; Gajdacz, M.; Deuretzbacher, Frank; Santos, Luis; Klempt, Carsten; Sherson, J.F.; Hilliard, A.J.; Arlt, J.J. (College Park, MD : American Physical Society, 2014)
    We have investigated spin dynamics in a two-dimensional quantum gas. Through spin-changing collisions, two clouds with opposite spin orientations are spontaneously created in a Bose-Einstein condensate. After ballistic ...
  • Scherer, Manuel; Lücke, Bernd; Peise, Jan; Topic, Oliver; Gebreyesus, Garu; Deuretzbacher, Frank; Ertmer, Wolfgang; Santos, Luis; Klempt, Carsten; Arlt, J.J. (College Park, MD : American Physical Society, 2013)
    We present an analytical model for the theoretical analysis of spin dynamics and spontaneous symmetry breaking in a spinor Bose-Einstein condensate (BEC). This allows for an excellent intuitive understanding of the processes ...
  • Deuretzbacher, Frank; Bruun, G.M.; Pethick, C.J.; Jona-Lasinio, Mattia; Reimann, S.M.; Santos, Luis (College Park, MD : American Physical Society, 2013)
    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 ...
  • Deuretzbacher, Frank; Cremon, J.C.; Reimann, S.M. (College Park, MD : American Physical Society, 2013)
    Erratum to Ground-state properties of few dipolar bosons in a quasi-one-dimensional harmonic trap, In: Physical Review A - Atomic, Molecular, and Optical Physics (2010) 81 (063616)
  • Heinze, Jannes; Deuretzbacher, Frank; Pfannkuche, Daniela (College Park, MD : American Physical Society, 2010)
    We study the dependency of the quantum spin dynamics on the particle number in a system of ultracold spin-1 atoms within the single-spatial-mode approximation. We find, for all strengths of the spin-dependent interaction, ...
  • Deuretzbacher, Frank; Gebreyesus, Garu; Topic, Oliver; Scherer, Manuel; Lücke, Bernd; Ertmer, Wolfgang; Arlt, J.J.; Klempt, Carsten; Santos, Luis (College Park, MD : American Physical Society, 2010)
    Spin-changing collisions may lead under proper conditions to the parametric amplification of matter waves in spinor Bose-Einstein condensates. Magnetic dipole-dipole interactions, although typically very weak in alkalimetal ...
  • Deuretzbacher, Frank; Cremon, J.C.; Reimann, S.M. (College Park, MD : American Physical Society, 2010)
    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 ...
  • Baringhaus, Jens; Settnes, Mikkel; Aprojanz, Johannes; Power, Stephen R.; Jauho, Antti-Pekka; Tegenkamp, Christoph (College Park, MD : American Physical Society, 2016)
    We realize nanometer size constrictions in ballistic graphene nanoribbons grown on sidewalls of SiC mesa structures. The high quality of our devices allows the observation of a number of electronic quantum interference ...
  • Vattuone, L.; Smerieri, M.; Langer, Thomas; Tegenkamp, Christoph; Pfnür, Herbert; Silkin, V.M.; Chulkov, E.V.; Echenique, P.M.; Rocca, M. (College Park, MD : American Physical Society, 2013)
    The linear dispersion of the low-dimensional acoustic surface plasmon (ASP) opens perspectives in energy conversion, transport, and confinement far below optical frequencies. Although the ASP exists in a wide class of ...
  • Murmann, S.; Deuretzbacher, Frank; Zürn, G.; Bjerlin, J.; Reimann, S.M.; Santos, Luis; Lompe, T.; Jochim, S. (College Park, MD : American Physical Society, 2015)
    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 ...
  • Smerieri, M.; Vattuone, L.; Savio, L.; Langer, Thomas; Tegenkamp, Christoph; Pfnür, Herbert; Silkin, V.M.; Rocca, M. (College Park, MD : American Physical Society, 2014)
    Understanding acoustic surface plasmons (ASPs) in the presence of nanosized gratings is necessary for the development of future devices that couple light with ASPs. We show here by experiment and theory that two ASPs exist ...
  • Tegenkamp, Christoph; Lükermann, Daniel; Pfnür, Herbert; Slomski, B.; Landolt, G.; Dil, J.H. (College Park, MD : American Physical Society, 2012)
    The mutual interplay between superlattice structures, band filling factors, and spin-orbit coupling results in a highly correlated electronic spin and charge state found for an array of atomic Pb wires grown on Si(557). ...
  • Scherer, Manuel; Lücke, Bernd; Gebreyesus, Garu; Topic, Oliver; Deuretzbacher, Frank; Ertmer, Wolfgang; Santos, Luis; Arlt, J.J.; Klempt, Carsten (College Park, MD : American Physical Society, 2010)
    Parametric amplification of quantum fluctuations constitutes a fundamental mechanism for spontaneous symmetry breaking. In our experiments, a spinor condensate acts as a parametric amplifier of spin modes, resulting in a ...
  • Tegenkamp, Christoph; Ohta, T.; McChesney, J.L.; Dil, H.; Rotenberg, E.; Pfnür, Herbert; Horn, K. (College Park, MD : American Physical Society, 2008)
    The Pb/Si(557) system exhibits a strong anisotropy in conductance below 78 K, with the evolution of a characteristic chain structure. Here we show, using angle-resolved photoemission, that chain ordering results in complete ...
  • Edler, Frederick; Miccoli, Ilio; Stöckmann, Jan Philipp; Pfnür, Herbert; Braun, C.; Neufeld, S.; Sanna, S.; Schmidt, W.G.; Tegenkamp, Christoph (College Park, MD : American Physical Society, 2017)
    Adsorption of Au on vicinal Si(111) surfaces results in growth of long-range ordered metallic quantum wires. In this paper, we utilized site-specific and selective adsorption of oxygen to modify chemically the transport ...

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