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

230 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

Access to Document

10.1038/NNANO.2017.68

Cite this

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.

@article{a6acf32733b44b54afd790e3de3a6944,

title = "Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field",

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 light3-5. Lifting the valley degeneracy by Zeeman splitting has been demonstrated recently, which may enable valley control by a magnetic field6-9. 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.",

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

note = "Publisher Copyright: {\textcopyright} 2017 Macmillan Publishers Limite.",

year = "2017",

month = aug,

day = "1",

doi = "10.1038/NNANO.2017.68",

language = "English (US)",

volume = "12",

pages = "757--762",

journal = "Nature Nanotechnology",

issn = "1748-3387",

publisher = "Nature Publishing Group",

number = "8",

}

TY - JOUR

T1 - Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field

AU - Zhao, Chuan

AU - Norden, Tenzin

AU - Zhang, Peiyao

AU - Zhao, Puqin

AU - Cheng, Yingchun

AU - Sun, Fan

AU - Parry, James P.

AU - Taheri, Payam

AU - Wang, Jieqiong

AU - Yang, Yihang

AU - Scrace, Thomas

AU - Kang, Kaifei

AU - Yang, Sen

AU - Miao, Guo Xing

AU - Sabirianov, Renat

AU - Kioseoglou, George

AU - Huang, Wei

AU - Petrou, Athos

AU - Zeng, Hao

PY - 2017/8/1

Y1 - 2017/8/1

N2 - 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 light3-5. Lifting the valley degeneracy by Zeeman splitting has been demonstrated recently, which may enable valley control by a magnetic field6-9. 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.

AB - 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 light3-5. Lifting the valley degeneracy by Zeeman splitting has been demonstrated recently, which may enable valley control by a magnetic field6-9. 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.

UR - http://www.scopus.com/inward/record.url?scp=85018345870&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85018345870&partnerID=8YFLogxK

U2 - 10.1038/NNANO.2017.68

DO - 10.1038/NNANO.2017.68

M3 - Article

C2 - 28459469

AN - SCOPUS:85018345870

VL - 12

SP - 757

EP - 762

JO - Nature Nanotechnology

JF - Nature Nanotechnology

SN - 1748-3387

IS - 8

ER -

Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this