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Title: Theory of the spin-Seebeck effect at a topological-insulator/ferromagnetic-insulator interface

Abstract

The spin-Seebeck effect refers to voltage signals induced in metals by thermally driven spin currents in adjacent magnetic systems. We present a theory of the spin-Seebeck signal in the case where the conductor that supports the voltage signal is the topologically protected two-dimensional surface-state system at the interface between a ferromagnetic insulator (FI) and a topological insulator (TI). Our theory uses a Dirac model for the TI surface states and assumes Heisenberg exchange coupling between the TI quasiparticles and the FI magnetization. The spin-Seebeck voltage is induced by the TI surface states scattering off the nonequilibrium magnon population at the surface of the semi-infinite thermally driven FI. Our theory is readily generalized to spin-Seebeck voltages in any two-dimensional conductor that is exchange-coupled to the surface of a FI. Surface-state carrier-density-dependent signal strengths calculated using Bi 2Te 3 and yttrium iron garnet material parameters are consistent with recent experiments.

Authors:
 [1];  [2];  [2]
  1. Univ. of Tokyo, Hongo (Japan)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1389005
Alternate Identifier(s):
OSTI ID: 1351680
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 16; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Okuma, Nobuyuki, Masir, Massoud Ramezani, and MacDonald, Allan H. Theory of the spin-Seebeck effect at a topological-insulator/ferromagnetic-insulator interface. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.165418.
Okuma, Nobuyuki, Masir, Massoud Ramezani, & MacDonald, Allan H. Theory of the spin-Seebeck effect at a topological-insulator/ferromagnetic-insulator interface. United States. doi:10.1103/PhysRevB.95.165418.
Okuma, Nobuyuki, Masir, Massoud Ramezani, and MacDonald, Allan H. Thu . "Theory of the spin-Seebeck effect at a topological-insulator/ferromagnetic-insulator interface". United States. doi:10.1103/PhysRevB.95.165418. https://www.osti.gov/servlets/purl/1389005.
@article{osti_1389005,
title = {Theory of the spin-Seebeck effect at a topological-insulator/ferromagnetic-insulator interface},
author = {Okuma, Nobuyuki and Masir, Massoud Ramezani and MacDonald, Allan H.},
abstractNote = {The spin-Seebeck effect refers to voltage signals induced in metals by thermally driven spin currents in adjacent magnetic systems. We present a theory of the spin-Seebeck signal in the case where the conductor that supports the voltage signal is the topologically protected two-dimensional surface-state system at the interface between a ferromagnetic insulator (FI) and a topological insulator (TI). Our theory uses a Dirac model for the TI surface states and assumes Heisenberg exchange coupling between the TI quasiparticles and the FI magnetization. The spin-Seebeck voltage is induced by the TI surface states scattering off the nonequilibrium magnon population at the surface of the semi-infinite thermally driven FI. Our theory is readily generalized to spin-Seebeck voltages in any two-dimensional conductor that is exchange-coupled to the surface of a FI. Surface-state carrier-density-dependent signal strengths calculated using Bi2Te3 and yttrium iron garnet material parameters are consistent with recent experiments.},
doi = {10.1103/PhysRevB.95.165418},
journal = {Physical Review B},
number = 16,
volume = 95,
place = {United States},
year = {2017},
month = {4}
}

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Cited by: 2 works
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    Works referencing / citing this record:

    Enhanced Spin Seebeck Efficiency in Closed Triple Quantum Dots Ring with Spin-Dependent Interdot Couplings
    journal, July 2019

    • Yu, Shu-Chao; Chi, Feng; Liu, Li-Ming
    • International Journal of Theoretical Physics, Vol. 58, Issue 9
    • DOI: 10.1007/s10773-019-04106-7

    Enhanced Spin Seebeck Efficiency in Closed Triple Quantum Dots Ring with Spin-Dependent Interdot Couplings
    journal, July 2019

    • Yu, Shu-Chao; Chi, Feng; Liu, Li-Ming
    • International Journal of Theoretical Physics, Vol. 58, Issue 9
    • DOI: 10.1007/s10773-019-04106-7