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  1. Article ; Online: Interaction of spin and vibrations in transport through single-molecule magnets.

    May, Falk / Wegewijs, Maarten R / Hofstetter, Walter

    Beilstein journal of nanotechnology

    2011  Volume 2, Page(s) 693–698

    Abstract: We study electron transport through a single-molecule magnet (SMM) and the interplay of its anisotropic spin with quantized vibrational distortions of the molecule. Based on numerical renormalization group calculations we show that, despite the ... ...

    Abstract We study electron transport through a single-molecule magnet (SMM) and the interplay of its anisotropic spin with quantized vibrational distortions of the molecule. Based on numerical renormalization group calculations we show that, despite the longitudinal anisotropy barrier and small transverse anisotropy, vibrational fluctuations can induce quantum spin-tunneling (QST) and a QST-Kondo effect. The interplay of spin scattering, QST and molecular vibrations can strongly enhance the Kondo effect and induce an anomalous magnetic field dependence of vibrational Kondo side-bands.
    Language English
    Publishing date 2011-10-18
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2583584-1
    ISSN 2190-4286 ; 2190-4286
    ISSN (online) 2190-4286
    ISSN 2190-4286
    DOI 10.3762/bjnano.2.75
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Interaction-induced adiabatic nonlinear transport.

    Reckermann, Felix / Splettstoesser, Janine / Wegewijs, Maarten R

    Physical review letters

    2010  Volume 104, Issue 22, Page(s) 226803

    Abstract: We calculate the time-dependent nonlinear transport current through an interacting quantum dot in the single-electron tunneling (SET) regime. We show that an additional dc current is generated by the electron-electron interaction by adiabatic out-of- ... ...

    Abstract We calculate the time-dependent nonlinear transport current through an interacting quantum dot in the single-electron tunneling (SET) regime. We show that an additional dc current is generated by the electron-electron interaction by adiabatic out-of-phase modulation of the gate and bias voltage. This current can arise only when two SET resonance conditions are simultaneously satisfied. We propose an adiabatic transport spectroscopy where lock-in measurement of a "time-averaged stability diagram" probes interactions, tunnel asymmetries, and changes in the ground state spin degeneracy.
    Language English
    Publishing date 2010-06-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.104.226803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Transport and accumulation of spin anisotropy.

    Baumgärtel, Michael M E / Hell, Michael / Das, Sourin / Wegewijs, Maarten R

    Physical review letters

    2011  Volume 107, Issue 8, Page(s) 87202

    Abstract: We show that spin anisotropy can be transferred to an isotropic system by transport of a spin-quadrupole moment. We derive the quadrupole moment current and continuity equation and study a spin-valve structure consisting of two ferromagnets coupled to a ... ...

    Abstract We show that spin anisotropy can be transferred to an isotropic system by transport of a spin-quadrupole moment. We derive the quadrupole moment current and continuity equation and study a spin-valve structure consisting of two ferromagnets coupled to a quantum dot probing an impurity spin. The quadrupole backaction on their coupled spin results in spin torques and anisotropic spin relaxation which do not follow from standard spin-current considerations. We demonstrate the detection of the impurity spin by charge transport and its manipulation by electric fields.
    Language English
    Publishing date 2011-08-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.107.087202
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  4. Article: Nonequilibrium dynamics of anisotropic large spins in the kondo regime: time-dependent numerical renormalization group analysis.

    Roosen, David / Wegewijs, Maarten R / Hofstetter, Walter

    Physical review letters

    2008  Volume 100, Issue 8, Page(s) 87201

    Abstract: We investigate the time-dependent Kondo effect in a single-molecule magnet (SMM) strongly coupled to metallic electrodes. Describing the SMM by a Kondo model with large spin S>1/2, we analyze the underscreening of the local moment and the effect of ... ...

    Abstract We investigate the time-dependent Kondo effect in a single-molecule magnet (SMM) strongly coupled to metallic electrodes. Describing the SMM by a Kondo model with large spin S>1/2, we analyze the underscreening of the local moment and the effect of anisotropy terms on the relaxation dynamics of the magnetization. Underscreening by single-channel Kondo processes leads to a logarithmically slow relaxation, while finite uniaxial anisotropy causes a saturation of the SMM's magnetization. Additional transverse anisotropy terms induce quantum spin tunneling and a pseudospin-1/2 Kondo effect sensitive to the spin parity.
    Language English
    Publishing date 2008-02-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.100.087201
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  5. Article ; Online: Electric field controlled magnetic anisotropy in a single molecule.

    Zyazin, Alexander S / van den Berg, Johan W G / Osorio, Edgar A / van der Zant, Herre S J / Konstantinidis, Nikolaos P / Leijnse, Martin / Wegewijs, Maarten R / May, Falk / Hofstetter, Walter / Danieli, Chiara / Cornia, Andrea

    Nano letters

    2010  Volume 10, Issue 9, Page(s) 3307–3311

    Abstract: We have measured quantum transport through an individual Fe(4) single-molecule magnet embedded in a three-terminal device geometry. The characteristic zero-field splittings of adjacent charge states and their magnetic field evolution are observed in ... ...

    Abstract We have measured quantum transport through an individual Fe(4) single-molecule magnet embedded in a three-terminal device geometry. The characteristic zero-field splittings of adjacent charge states and their magnetic field evolution are observed in inelastic tunneling spectroscopy. We demonstrate that the molecule retains its magnetic properties and, moreover, that the magnetic anisotropy is significantly enhanced by reversible electron addition/subtraction controlled with the gate voltage. Single-molecule magnetism can thus be electrically controlled.
    Language English
    Publishing date 2010-08-05
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/nl1009603
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Online: Electric Field Controlled Magnetic Anisotropy in a Single Molecule

    Zyazin, Alexander S. / Berg, Johan W. G. van den / Osorio, Edgar A. / van der Zant, Herre S. J. / Konstantinidis, Nikolaos P. / Leijnse, Martin / Wegewijs, Maarten R. / May, Falk / Hofstetter, Walter / Danieli, Chiara / Cornia, Andrea

    2010  

    Abstract: We have measured quantum transport through an individual Fe$_4$ single-molecule magnet embedded in a three-terminal device geometry. The characteristic zero-field splittings of adjacent charge states and their magnetic field evolution are observed in ... ...

    Abstract We have measured quantum transport through an individual Fe$_4$ single-molecule magnet embedded in a three-terminal device geometry. The characteristic zero-field splittings of adjacent charge states and their magnetic field evolution are observed in inelastic tunneling spectroscopy. We demonstrate that the molecule retains its magnetic properties, and moreover, that the magnetic anisotropy is significantly enhanced by reversible electron addition / subtraction controlled with the gate voltage. Single-molecule magnetism can thus be electrically controlled.
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Publishing date 2010-09-10
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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