Auflistung nach Schlagwort "Electron gas"

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  • Adiabatic spin cooling using high-spin Fermi gases 
    Colomé-Tatché, Maria; Klempt, Carsten; Santos, Luis; Vekua, Teimuraz (Bristol : IOP Publishing Ltd., 2011)
    Spatial entropy redistribution plays a key role in adiabatic cooling of ultra-cold lattice gases. We show that high-spin fermions with a spatially variable quadratic Zeeman coupling may allow for the creation of an inner ...
  • Dynamics of Dark Solitons in Elongated Bose-Einstein Condensates 
    Muryshev, A.; Shlyapnikov, G.V.; Ertmer, Wolfgang; Sengstock, K.; Lewenstein, M. (American Physical Society, 2002)
    We find two types of moving dark soliton textures in elongated condensates: nonstationary kinks and proper dark solitons. The latter have a flat notch region and we obtain the diagram of their dynamical stability. At finite ...
  • Influence of oval defects on transport properties in high-mobility two-dimensional electron gases 
    Bockhorn, L.; Velieva, A.; Hakim, S.; Wagner, Timo; Rugeramigabo, Eddy P.; Schuh, D.; Reichl, C.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2016)
    Rare macroscopic growth defects next to a two-dimensional electron gas influence transport properties and cause a negative magnetoresistance. On the basis of this, we show that the number of oval defects seen on the material ...
  • Interaction-induced huge magnetoresistance in a high mobility two-dimensional electron gas 
    Bockhorn, L.; Gornyi, I.V.; Schuh, D.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2013)
    A strong negative magnetoresistance is observed in a high-mobility two-dimensional electron gas in a GaAs/Al0.3Ga0.7As quantum well. We discuss that the negative magnetoresistance consists of a small peak induced by a ...
  • Observation of an interedge magnetoplasmon mode in a degenerate two-dimensional electron gas 
    Sukhodub, G.; Hohls, Frank; Haug, Rolf J. (College Park, MD : American Physical Society, 2004)
    The propagation of edge magnetoplasmons (EMP) in a degenerated two-dimensional electron gas was analyzed. Investigations show that an interedge EMP mode attributed to the excitations of boundary between two regions with ...
  • Observation of phase fluctuations in elongated bose-einstein condensates 
    Dettmer, S.; Hellweg, D.; Ryytty, P.; Arlt, Jan J.; Ertmer, Wolfgang; Sengstock, K.; Petrov, D.S.; Shlyapnikov, G.V.; Kreutzmann, H.; Santos, Luis; Lewenstein, M. (American Physical Society, 2001)
    The occurrence of phase fluctuations due to thermal excitations in Bose-Einstein condensates (BECs) is studied for a variety of temperatures and trap geometries. We observe the statistical nature of the appearance of phase ...
  • Quantum magnetism without lattices in strongly interacting one-dimensional spinor gases 
    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 ...
  • Self-bound many-body states of quasi-one-dimensional dipolar Fermi gases: Exploiting Bose-Fermi mappings for generalized contact interactions 
    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 ...
  • Unconventional phases of attractive Fermi gases in synthetic Hall ribbons 
    Ghosh, Sudeep Kumar; Greschner, Sebastian; Yadav, Umesh K.; Mishra, Tapan; Rizzi, Matteo; Shenoy, Vijay B. (College Park, MD : American Physical Society, 2017)
    An innovative way to produce quantum Hall ribbons in a cold atomic system is to use M hyperfine states of atoms in a one-dimensional optical lattice to mimic an additional "synthetic dimension." A notable aspect here is ...