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Hidden spin polarization in the centrosymmetric Mo S2 crystal revealed via elliptically polarized terahertz emission

Huang, Yuanyuan ; Yartsev, Arkady LU orcid ; Guan, Shan ; Zhu, Lipeng ; Zhao, Qiyi ; Yao, Zehan LU ; He, Chuan ; Zhang, Longhui ; Bai, Jintao and Luo, Jun Wei , et al. (2020) In Physical Review B 102(8).
Abstract

The spin polarization in centrosymmetric molybdenum disulfide (MoS2) bulk crystal is recorded by helicity dependent photocurrent exposed as elliptically polarized terahertz (THz) emission. We assign this observation to hidden spin polarization due to the local Dresselhaus effect induced by the molybdenum atomic site asymmetry. This spin polarization induces ultrafast optically controlled circular photogalvanic current that results in elliptically polarized THz emission. Furthermore, this THz radiation exhibits a helicity dependent bleaching effect under opposite circularly polarized excitations due to the spin relaxation. Our results demonstrate the viability of all-optical control of hidden spin polarization in two-dimensional... (More)

The spin polarization in centrosymmetric molybdenum disulfide (MoS2) bulk crystal is recorded by helicity dependent photocurrent exposed as elliptically polarized terahertz (THz) emission. We assign this observation to hidden spin polarization due to the local Dresselhaus effect induced by the molybdenum atomic site asymmetry. This spin polarization induces ultrafast optically controlled circular photogalvanic current that results in elliptically polarized THz emission. Furthermore, this THz radiation exhibits a helicity dependent bleaching effect under opposite circularly polarized excitations due to the spin relaxation. Our results demonstrate the viability of all-optical control of hidden spin polarization in two-dimensional materials and propose the applicability of the THz emission spectroscopy as a sensitive and contactless method to study spintronic physics in two-dimensional materials.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
102
issue
8
article number
085205
publisher
American Physical Society
external identifiers
  • scopus:85093075122
ISSN
2469-9950
DOI
10.1103/PhysRevB.102.085205
language
English
LU publication?
yes
id
afaadcaf-0350-4e81-b60f-93b6ea656227
date added to LUP
2020-11-10 11:58:35
date last changed
2023-11-20 14:24:14
@article{afaadcaf-0350-4e81-b60f-93b6ea656227,
  abstract     = {{<p>The spin polarization in centrosymmetric molybdenum disulfide (MoS2) bulk crystal is recorded by helicity dependent photocurrent exposed as elliptically polarized terahertz (THz) emission. We assign this observation to hidden spin polarization due to the local Dresselhaus effect induced by the molybdenum atomic site asymmetry. This spin polarization induces ultrafast optically controlled circular photogalvanic current that results in elliptically polarized THz emission. Furthermore, this THz radiation exhibits a helicity dependent bleaching effect under opposite circularly polarized excitations due to the spin relaxation. Our results demonstrate the viability of all-optical control of hidden spin polarization in two-dimensional materials and propose the applicability of the THz emission spectroscopy as a sensitive and contactless method to study spintronic physics in two-dimensional materials.</p>}},
  author       = {{Huang, Yuanyuan and Yartsev, Arkady and Guan, Shan and Zhu, Lipeng and Zhao, Qiyi and Yao, Zehan and He, Chuan and Zhang, Longhui and Bai, Jintao and Luo, Jun Wei and Xu, Xinlong}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Hidden spin polarization in the centrosymmetric Mo S2 crystal revealed via elliptically polarized terahertz emission}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.102.085205}},
  doi          = {{10.1103/PhysRevB.102.085205}},
  volume       = {{102}},
  year         = {{2020}},
}