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Title: Analytical theory and possible detection of the ac quantum spin Hall effect

Here, we develop an analytical theory of the low-frequency ac quantum spin Hall (QSH) effect based upon the scattering matrix formalism. It is shown that the ac QSH effect can be interpreted as a bulk quantum pumping effect. When the electron spin is conserved, the integer-quantized ac spin Hall conductivity can be linked to the winding numbers of the reflection matrices in the electrodes, which also equal to the bulk spin Chern numbers of the QSH material. Furthermore, a possible experimental scheme by using ferromagnetic metals as electrodes is proposed to detect the topological ac spin current by electrical means.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [3]
  1. Nanjing Univ. of Technology (China). National Lab. of Solid State Microstructures and Dept. of Physics; South China Univ. of Technology (SCUT), Guangzhou (China). Dept. of Physics
  2. Nanjing Univ. of Technology (China). National Lab. of Solid State Microstructures and Dept. of Physics
  3. Nanjing Univ. of Technology (China). National Lab. of Solid State Microstructures and Dept. of Physics and Collaborative Innovation Center of Advanced Microstructures
  4. California State Univ., Northridge, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
FG02-06ER46305; 2015CB921202; 2014CB921103; 11674160; 11474149; BX201700082
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
California State Univ., Northridge, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Basic Research Program of China; National Natural Science Foundation of China (NNSFC); Jiangsu Higher Education Inst. (PAPD)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; spintronics; topological insulators
OSTI Identifier:
1430125

Deng, W. Y., Ren, Y. J., Lin, Z. X., Shen, R., Sheng, L., Sheng, D. N., and Xing, D. Y.. Analytical theory and possible detection of the ac quantum spin Hall effect. United States: N. p., Web. doi:10.1038/s41598-017-05452-4.
Deng, W. Y., Ren, Y. J., Lin, Z. X., Shen, R., Sheng, L., Sheng, D. N., & Xing, D. Y.. Analytical theory and possible detection of the ac quantum spin Hall effect. United States. doi:10.1038/s41598-017-05452-4.
Deng, W. Y., Ren, Y. J., Lin, Z. X., Shen, R., Sheng, L., Sheng, D. N., and Xing, D. Y.. 2017. "Analytical theory and possible detection of the ac quantum spin Hall effect". United States. doi:10.1038/s41598-017-05452-4. https://www.osti.gov/servlets/purl/1430125.
@article{osti_1430125,
title = {Analytical theory and possible detection of the ac quantum spin Hall effect},
author = {Deng, W. Y. and Ren, Y. J. and Lin, Z. X. and Shen, R. and Sheng, L. and Sheng, D. N. and Xing, D. Y.},
abstractNote = {Here, we develop an analytical theory of the low-frequency ac quantum spin Hall (QSH) effect based upon the scattering matrix formalism. It is shown that the ac QSH effect can be interpreted as a bulk quantum pumping effect. When the electron spin is conserved, the integer-quantized ac spin Hall conductivity can be linked to the winding numbers of the reflection matrices in the electrodes, which also equal to the bulk spin Chern numbers of the QSH material. Furthermore, a possible experimental scheme by using ferromagnetic metals as electrodes is proposed to detect the topological ac spin current by electrical means.},
doi = {10.1038/s41598-017-05452-4},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {7}
}

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