Quantum spin pumping with adiabatically modulated magnetic barriers

Benjamin, Ronald; Benjamin, Colin

doi:10.1103/physrevb.69.085318

Cited by 63 publications

(40 citation statements)

References 43 publications

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“…And almost simultaneously with the discovering of the Berry phase, Thouless proposed a mechanism of adiabatic transport of particles [26]. Recently, this lead to discovery and intensive research of charge adiabatic pumping [27][28][29][30][31][32][33][34][35][36][37][38][39][40], and later spin adiabatic pumping [41][42][43][44][45][46][47][48][49][50][51][52][53]. At the same time the authors of the works described the emergence of the charge and spin dissipationless currents of particles in various solids.…”

Section: The Spin Gauge Fieldmentioning

confidence: 99%

Spin gauge fields: From Berry phase to topological spin transport and Hall effects

Bliokh

2005

Annals of Physics

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Section: The Spin Gauge Fieldmentioning

confidence: 99%

Spin gauge fields: From Berry phase to topological spin transport and Hall effects

Bliokh

2005

Annals of Physics

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“…Such formalism was readily extended to non-adiabatic regime, which is valid in the whole spectrum of frequency. 15 If the spin degree of freedom is incorporated, spin-dependent transmission coefficients can be differentiated either directly by external magnetic field 16,17 or by spin-orbit interaction.…”

Section: 9mentioning

confidence: 99%

Nonmagnetic control of spin flow: Generation of pure spin current in a Rashba-Dresselhaus quantum channel

2008

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We demonstrate a spin pump to generate pure spin current of tunable intensity and polarization in the absence of charge current. The pumping functionality is achieved by means of an ac gate voltage that modulates the Rashba constant dynamically in a local region of a quantum channel with both static Rashba and Dresselhaus spin-orbit interactions. Spin-resolved Floquet scattering matrix is calculated to analyze the whole scattering process. Pumped spin current can be divided into spinpreserved transmission and spin-flip reflection parts. These two terms have opposite polarization of spin current and are competing with each other. Our proposed spin-based device can be utilized for non-magnetic control of spin flow by tuning the ac gate voltage and the driving frequency.

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“…Low dimensional nanostructures, such as carbon nanotubes (CNT) 9,10 and graphene 11,12 were also proposed as potential candidates. Investigation on electron pump also triggers the proposal of spin pump [13][14][15] , in which a spin current is induced by various means.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of parametric pumping current in mesoscopic systems in the presence of a magnetic field

Xing

Wang

2011

Phys. Rev. B

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We numerically study the parametric pumped current when magnetic field is applied both in the adiabatic and non-adiabatic regimes. In particular, we investigate the nature of pumped current for systems with resonance as well as anti-resonance. It is found that in the adiabatic regime, the pumped current changes sign across the sharp resonance with long lifetime while the non-adiabatic pumped current at finite frequency does not. When the lifetime of resonant level is short, the behaviors of adiabatic and non-adiabatic pumped current are similar with sign changes. Our results show that at the energy where complete transmission occurs the adiabatic pumped current is zero while non-adiabatic pumped current is non-zero. Different from the resonant case, both adiabatic and non-adiabatic pumped current are zero at anti-resonance with complete reflection. We also investigate the pumped current when the other system parameters such as magnetic field, pumped frequency, and pumping potentials. Interesting behaviors are revealed. Finally, we study the symmetry relation of pumped current for several systems with different spatial symmetry upon reversal of magnetic field. Different from the previous theoretical prediction, we find that a system with general inversion symmetry can pump out a finite current in the adiabatic regime. At small magnetic field, the pumped current has an approximate relation I(B) ≈ I(−B) both in adiabatic and non-adiabatic regimes.

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Quantum spin pumping with adiabatically modulated magnetic barriers

Cited by 63 publications

References 43 publications

Spin gauge fields: From Berry phase to topological spin transport and Hall effects

Spin gauge fields: From Berry phase to topological spin transport and Hall effects

Nonmagnetic control of spin flow: Generation of pure spin current in a Rashba-Dresselhaus quantum channel

Numerical study of parametric pumping current in mesoscopic systems in the presence of a magnetic field

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