Spin backflow: A non-Markovian effect on spin pumping

  title={Spin backflow: A non-Markovian effect on spin pumping},
  author={Kazunari Hashimoto and Gen Tatara and Chikako Uchiyama},
  journal={Physical Review B},
The miniaturization of spintronic devices, specifically, nanoscale devices employing spintronics, has attracted intensive attention from a scientific as well as engineering perspective. In this paper, we study a non-Markovian effect on spin pumping to describe spin current generation driven by the magnetization of arbitrary precession frequency in a quantum dot attached to an electron lead. Although the Markovian approximation can be used when driving is sufficiently slow compared with… Expand

Figures from this paper

Nonadiabaticity in Quantum Pumping Phenomena under Relaxation
The studies which go beyond the conventional adiabatic approximation for open quantum systems to transfer energy quanta and electron spins with using the full counting statistics are reviewed. Expand
Pumping current in a non-Markovian two-state model
A simple periodically modulated two-state model whose dynamics is governed by a master equation is extended to have memory, leading to a time-convoluted generalized master equation. It is shown thatExpand
Non-Markovian effect on quantum Otto engine: Role of system-reservoir interaction
The authors analyze a quantum heat engine by computing the dynamics under the interactions between the working substance and the heat baths.


Nonadiabaticity in spin pumping under relaxation
Using a minimum model consisting of a magnetic quantum dot and an electron lead, we investigate spin pumping by its precessing magnetization. Focusing on the ``adiabaticity,'' which is quantifiedExpand
Single electron spintronics
  • K. Dempsey, D. Ciudad, C. Marrows
  • Physics, Medicine
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2011
Conventional spintronics makes use of the average spin-polarization of a large ensemble of electrons: this new approach offers the prospect of accessing the quantum properties of the electron, and is a candidate approach to the construction of solid-state spin-based qubits. Expand
Consistent microscopic analysis of spin pumping effects
We present a consistent microscopic study of spin pumping effects for both metallic and insulating ferromagnets. As for metallic case, we present a simple quantum mechanical picture of the effect asExpand
Effective gauge field theory of spintronics
  • G. Tatara
  • Physics
  • Physica E: Low-dimensional Systems and Nanostructures
  • 2019
Abstract The aim of this paper is to present a comprehensive theory of spintronics phenomena based on the concept of effective gauge field, the spin gauge field. An effective gauge field generallyExpand
Interaction effect on adiabatic pump of charge and spin in quantum dot
We investigate the pumped charge and spin at zero-bias by adiabatic modulation of two control parameters using the full counting statistics with quantum master equation approach. First we studyExpand
Spin current through a quantum dot in the presence of an oscillating magnetic field.
The Kondo-type cotunneling contribution is manifested by a large enhancement of the pumped spin current in the strong coupling low temperature regime. Expand
Theory of spin pumping through an interacting quantum dot tunnel coupled to a ferromagnet with time-dependent magnetization
We investigate two schemes for pumping spin adiabatically from a ferromagnet through an interacting quantum dot into a normal lead that exploit the possibility to vary in time the ferromagnet'sExpand
Adiabatic charge and spin pumping through quantum dots with ferromagnetic leads
We study the adiabatic pumping of electrons through quantum dots attached to ferromagnetic leads. Hereby, we make use of a real-time diagrammatic technique in the adiabatic limit that takes theExpand
Nonadiabatic two-parameter charge and spin pumping in a quantum dot.
Interference effects between the oscillations of the voltage and tunnel couplings are found and it is shown that these interference effects may explain recent measurements in metallic islands. Expand
Spin pumping and magnetization dynamics in metallic multilayers
We study the magnetization dynamics in thin ferromagnetic films and small ferromagnetic particles in contact with paramagnetic conductors. A moving magnetization vector causes ‘‘pumping’’ of spinsExpand