Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field

Chuan Zhao; Tenzin Norden; Peiyao Zhang; Puqin Zhao; Yingchun Cheng; Fan Sun; James P. Parry; Payam Taheri; Jieqiong Wang; Yihang Yang; Thomas Scrace; Kaifei Kang; Sen Yang; Guo Xing Miao; Renat Sabirianov; George Kioseoglou; Wei Huang; Athos Petrou; Hao Zeng

doi:10.1038/NNANO.2017.68

Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field

Chuan Zhao, Tenzin Norden, Peiyao Zhang, Puqin Zhao, Yingchun Cheng, Fan Sun, James P. Parry, Payam Taheri, Jieqiong Wang, Yihang Yang, Thomas Scrace, Kaifei Kang, Sen Yang, Guo Xing Miao, Renat Sabirianov, George Kioseoglou, Wei Huang, Athos Petrou, Hao Zeng

Physics

Research output: Contribution to journal › Article › peer-review

170 Scopus citations

Abstract

Exploiting the valley degree of freedom to store and manipulate information provides a novel paradigm for future electronics. A monolayer transition-metal dichalcogenide (TMDC) with a broken inversion symmetry possesses two degenerate yet inequivalent valleys1,2, which offers unique opportunities for valley control through the helicity of light^3-5. Lifting the valley degeneracy by Zeeman splitting has been demonstrated recently, which may enable valley control by a magnetic field^6-9. However, the realized valley splitting is modest (∼0.2 meV TC1). Here we show greatly enhanced valley spitting in monolayer WSe2, utilizing the interfacial magnetic exchange field (MEF) from a ferromagnetic EuS substrate. A valley splitting of 2.5 meV is demonstrated at 1 T by magnetoreflectance measurements and corresponds to an effective exchange field of ∼12 T. Moreover, the splitting follows the magnetization of EuS, a hallmark of the MEF. Utilizing the MEF of a magnetic insulator can induce magnetic order and valley and spin polarization in TMDCs, which may enable valleytronic and quantum-computing applications.

Original language	English (US)
Pages (from-to)	757-762
Number of pages	6
Journal	Nature Nanotechnology
Volume	12
Issue number	8
DOIs	https://doi.org/10.1038/NNANO.2017.68
State	Published - Aug 1 2017

ASJC Scopus subject areas

Bioengineering
Atomic and Molecular Physics, and Optics
Biomedical Engineering
Materials Science(all)
Condensed Matter Physics
Electrical and Electronic Engineering

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Zhao, C., Norden, T., Zhang, P., Zhao, P., Cheng, Y., Sun, F., Parry, J. P., Taheri, P., Wang, J., Yang, Y., Scrace, T., Kang, K., Yang, S., Miao, G. X., Sabirianov, R., Kioseoglou, G., Huang, W., Petrou, A., & Zeng, H. (2017). Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field. Nature Nanotechnology, 12(8), 757-762. https://doi.org/10.1038/NNANO.2017.68

Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field. / Zhao, Chuan; Norden, Tenzin; Zhang, Peiyao; Zhao, Puqin; Cheng, Yingchun; Sun, Fan; Parry, James P.; Taheri, Payam; Wang, Jieqiong; Yang, Yihang; Scrace, Thomas; Kang, Kaifei; Yang, Sen; Miao, Guo Xing; Sabirianov, Renat; Kioseoglou, George; Huang, Wei; Petrou, Athos; Zeng, Hao.

In: Nature Nanotechnology, Vol. 12, No. 8, 01.08.2017, p. 757-762.

Research output: Contribution to journal › Article › peer-review

Zhao, Chuan ; Norden, Tenzin ; Zhang, Peiyao ; Zhao, Puqin ; Cheng, Yingchun ; Sun, Fan ; Parry, James P. ; Taheri, Payam ; Wang, Jieqiong ; Yang, Yihang ; Scrace, Thomas ; Kang, Kaifei ; Yang, Sen ; Miao, Guo Xing ; Sabirianov, Renat ; Kioseoglou, George ; Huang, Wei ; Petrou, Athos ; Zeng, Hao. / Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field. In: Nature Nanotechnology. 2017 ; Vol. 12, No. 8. pp. 757-762.

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Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field

Abstract

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