Browsing by Subject "Magnetic fields"

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  • 40K-87Rb Feshbach resonances: Modeling the interatomic potential 
    Klempt, Carsten; Henninger, T.; Topic, O.; Will, J.; Ertmer, Wolfgang; Tiemann, E.; Arlt, Jan J. (College Park : American Physical Society, 2007)
    We have observed 28 heteronuclear Feshbach resonances in ten spin combinations of the hyperfine ground states of a 40K−87Rb mixture. The measurements were performed by observing the loss rates from an atomic mixture at ...
  • Band-to-Mott-insulator transformations in four-component alkali-metal fermions at half-filling 
    Jaramillo, J.; Greschner, Sebastian; Vekua, T. (College Park, MD : American Physical Society, 2013)
    Under the influence of an external magnetic field and spin-changing collisions, the band insulator state of one-dimensional s-wave repulsively interacting four-component fermions at half-filling transforms into Mott insulator ...
  • Berechnung der auftretenden lokalen Kräfte auf der magnetischen Beschichtung eines magnetischen Rasterkraftmikroskops [Computation of the occurring local forces on the magnetic coating of a magnetic atomic force microscope] 
    Preisner, T.; Mathis, Wolfgang (Göttingen : Copernicus GmbH, 2009)
    Due to magnetic interactions between magnetic field inducing bodies, force effects occur on the materials. The numerical computation of those occuring forces with respect to a subsequent structural analysis of a deformable ...
  • Biodistribution, biocompatibility and targeted accumulation of magnetic nanoporous silica nanoparticles as drug carrier in orthopedics 
    Janßen, Hilke Catherina; Angrisani, Nina; Kalies, Stefan; Hansmann, Florian; Kietzmann, Manfred; Warwas, Dawid Peter; Behrens, Peter; Reifenrath, Janin (London : BioMed Central Ltd., 2020)
    Background: In orthopedics, the treatment of implant-associated infections represents a high challenge. Especially, potent antibacterial effects at implant surfaces can only be achieved by the use of high doses of antibiotics, ...
  • Competition between Kondo Screening and Quantum Hall Edge Reconstruction 
    Heine, A.W.; Tutuc, D.; Zwicknagl, G.; Haug, Rolf J. (College Park, MD : American Physical Society, 2016)
    We report on a Kondo correlated quantum dot connected to two-dimensional leads where we demonstrate the renormalization of the g factor in the pure Zeeman case. i.e., for magnetic fields parallel to the plane of the quantum ...
  • Coupling in concentric double quantum rings 
    Mühle, A.; Wegscheider, W.; Haug, Rolf J. (College Park, MD : American Institute of Physics, 2007)
    We designed a device consisting of two concentric quantum rings in a GaAsAlGaAs heterostructure. The outer ring is connected to leads while the inner ring is only capacitively coupled to the rest of the system. Measuring ...
  • A cryogenic radio-frequency ion trap for quantum logic spectroscopy of highly charged ions 
    Leopold, T.; King, S.A.; Micke, P.; Bautista-Salvador, A.; Heip, J.C.; Ospelkaus, C.; Crespo López-Urrutia, J.R.; Schmidt, P.O. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2019)
    A cryogenic radio-frequency ion trap system designed for quantum logic spectroscopy of highly charged ions (HCI) is presented. It includes a segmented linear Paul trap, an in-vacuum imaging lens, and a helical resonator. ...
  • Doppler Cooling and Trapping on Forbidden Transitions 
    Binnewies, T.; Wilpers, G.; Sterr, U.; Riehle, F.; Helmcke, J.; Mehlstäubler, T.E.; Rasel, Ernst Maria; Ertmer, Wolfgang (American Physical Society, 2001)
    Ultracold atoms at temperatures close to the recoil limit have been achieved by extending Doppler cooling to forbidden transitions. A cloud of 40Ca atoms has been cooled and trapped to a temperature as low as 6μK by operating ...
  • Energy dependence of quasiparticle relaxation in a disordered Fermi liquid 
    Schmidt, T.; König, P.; McCann, E.; Fal'ko, V.I.; Haug, Rolf J. (College Park, MD : American Physical Society, 2001)
    Direct measurement of the energy dependence of the inelastic decay rate τ(E) of a quasiparticle state in a disordered conductor was performed using resonant tunneling spectroscopy. Decay rate was obtained from the analysis ...
  • Giant anisotropy of zeeman splitting of quantum confined acceptors in Si/Ge 
    Haendel, K.-M.; Winkler, R.; Denker, U.; Schmidt, O.G.; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    Shallow acceptor levels in Si/Ge/Si quantum well heterostructures are characterized by resonant-tunneling spectroscopy in the presence of high magnetic fields. In a perpendicular magnetic field we observe a linear Zeeman ...
  • Increased accumulation of magnetic nanoparticles by magnetizable implant materials for the treatment of implant-associated complications 
    Angrisani, Nina; Foth, Franziska; Kietzmann, Manfred; Schumacher, Stephan; Angrisani, Gian Luigi; Christel, Anne; Behrens, Peter; Reifenrath, Janin (London : BioMed Central Ltd., 2013)
    Background: In orthopaedic surgery, accumulation of agents such as anti-infectives in the bone as target tissue is difficult. The use of magnetic nanoparticles (MNPs) as carriers principally enables their accumulation via ...
  • Influence of the particle number on the spin dynamics of ultracold atoms 
    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, ...
  • Interaction-induced spin polarization in quantum dots 
    Rogge, M.C.; Räsänen, E.; Haug, Rolf J. (College Park, MD : American Physical Society, 2010)
    The electronic states of lateral many-electron quantum dots in high magnetic fields are analyzed in terms of energy and spin. In a regime with two Landau levels in the dot, several Coulomb-blockade peaks are measured. A ...
  • Interplay of Electron and Nuclear Spin Noise in n -Type GaAs 
    Berski, Fabian; Hübner, Jens; Oestreich, Michael; Ludwig, Arne; Wieck, A.D.; Glazov, Mikhail (College Park, MD : American Physical Society, 2015)
    We present spin-noise spectroscopy measurements on an ensemble of donor-bound electrons in ultrapure GaAs:Si covering temporal dynamics over 6 orders of magnitude from milliseconds to nanoseconds. The spin-noise spectra ...
  • Kondo effect in a few-electron quantum ring 
    Keyser, U.F.; Fühner, C.; Borck, S.; Haug, Rolf J.; Bichler, M.; Abstreiter, G.; Wegscheider, W. (College Park, MD : American Physical Society, 2003)
    A small tuneable quantum ring with less than ten electrons was shown to exhibit Aharonov-Bohm oscillations as well as Coulomb blockade. At strong coupling to the leads, evidence of a Kondo effect induced by a single spin ...
  • Low Temperature Relaxation of Donor Bound Electron Spins in Si 28: P 
    Sauter, E.; Abrosimov, N.V.; Hübner, J.; Oestreich, M. (College Park, Md. : APS, 2021)
    We measure the spin-lattice relaxation of donor bound electrons in ultrapure, isotopically enriched, phosphorus-doped Si28:P. The optical pump-probe experiments reveal at low temperatures extremely long spin relaxation ...
  • Low-temperature hysteresis in the field effect of bilayer graphene 
    Barthold, P.; Lüdtke, T.; Schmidt, H.; Haug, Rolf J. (Bristol : IOP Publishing Ltd., 2011)
    Hysteresis in the field effect of bilayer graphene is observed at a low temperature. We attribute this effect to charge traps in the substrate. When the sweep rate of the back-gate voltage is increased to higher values, ...
  • Multiple transitions of the spin configuration in quantum dots 
    Rogge, M.C.; Fühner, C.; Haug, Rolf J. (College Park, MD : American Physical Society, 2006)
    Single electron tunneling is studied in a many electron quantum dot in high magnetic fields. For such a system multiple transitions of the spin configuration are theoretically predicted. With a combination of spin blockade ...
  • A new high-integrated weak field sensor for automotive applications 
    Thiessen, T.; Prochaska, M. (Göttingen : Copernicus GmbH, 2009)
    Especially in the field of automotive applications smart sensor systems for magnetic field sensing face increasing requirements concerning low cost, low power consumption and high magnetic performance. Over the past years ...
  • Numerical computation of magnetic fields applied to magnetic force microscopy 
    Preisner, Thomas; Greiff, Michael; Bala, Uzzal Binit; Mathis, Wolfgang (Bingley : Emerald Group Publishing Ltd., 2009)
    Purpose - The purpose of this paper is to introduce a method which allows the calculation of the interactions of tip and sample of a magnetic force microscope as a first step to increase the accuracy of this technique. ...