Wu, S., Ross, J. S., Liu, G. B., Aivazian, G., Jones, A., Fei, Z., Zhu, W., Xiao, D., Yao, W., Cobden, D., & Xu, X. (2013). Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2 Nature Physics, 9(3), 149-153. https://doi.org/10.1038/nphys2524
Wu, Sanfeng ; Ross, Jason S. ; Liu, Gui Bin et al. / Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2 In: Nature Physics. 2013 ; Vol. 9, No. 3. pp. 149-153.
@article{3d93d754bcca43e49830b8893e15731b,
title = " Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2 ",
abstract = " Crystal symmetry governs the nature of electronic Bloch states. For example, in the presence of time-reversal symmetry, the orbital magnetic moment and Berry curvature of the Bloch states must vanish unless inversion symmetry is broken. In certain two-dimensional electron systems such as bilayer graphene, the intrinsic inversion symmetry can be broken simply by applying a perpendicular electric field. In principle, this offers the possibility of switching on/off and continuously tuning the magnetic moment and Berry curvature near the Dirac valleys by reversible electrical control. Here we investigate this possibility using polarization-resolved photoluminescence of bilayer MoS 2 , which has the same symmetry as bilayer graphene but has a bandgap in the visible spectrum allowing direct optical probing. We find that in bilayer MoS 2 the circularly polarized photoluminescence can be continuously tuned from-15% to 15% as a function of gate voltage, whereas in structurally non-centrosymmetric monolayer MoS 2 the photoluminescence polarization is gate independent. The observations are well explained as resulting from the continuous variation of orbital magnetic moments between positive and negative values through symmetry control.",
author = "Sanfeng Wu and Ross, {Jason S.} and Liu, {Gui Bin} and Grant Aivazian and Aaron Jones and Zaiyao Fei and Wenguang Zhu and Di Xiao and Wang Yao and David Cobden and Xiaodong Xu",
year = "2013",
month = mar,
doi = "10.1038/nphys2524",
language = "English",
volume = "9",
pages = "149--153",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "3",
}
Wu, S, Ross, JS, Liu, GB, Aivazian, G, Jones, A, Fei, Z, Zhu, W, Xiao, D, Yao, W, Cobden, D & Xu, X 2013, ' Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2 ', Nature Physics, vol. 9, no. 3, pp. 149-153. https://doi.org/10.1038/nphys2524
Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2 . / Wu, Sanfeng; Ross, Jason S.
; Liu, Gui Bin et al.
In:
Nature Physics, Vol. 9, No. 3, 03.2013, p. 149-153.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2
AU - Wu, Sanfeng
AU - Ross, Jason S.
AU - Liu, Gui Bin
AU - Aivazian, Grant
AU - Jones, Aaron
AU - Fei, Zaiyao
AU - Zhu, Wenguang
AU - Xiao, Di
AU - Yao, Wang
AU - Cobden, David
AU - Xu, Xiaodong
PY - 2013/3
Y1 - 2013/3
N2 - Crystal symmetry governs the nature of electronic Bloch states. For example, in the presence of time-reversal symmetry, the orbital magnetic moment and Berry curvature of the Bloch states must vanish unless inversion symmetry is broken. In certain two-dimensional electron systems such as bilayer graphene, the intrinsic inversion symmetry can be broken simply by applying a perpendicular electric field. In principle, this offers the possibility of switching on/off and continuously tuning the magnetic moment and Berry curvature near the Dirac valleys by reversible electrical control. Here we investigate this possibility using polarization-resolved photoluminescence of bilayer MoS 2 , which has the same symmetry as bilayer graphene but has a bandgap in the visible spectrum allowing direct optical probing. We find that in bilayer MoS 2 the circularly polarized photoluminescence can be continuously tuned from-15% to 15% as a function of gate voltage, whereas in structurally non-centrosymmetric monolayer MoS 2 the photoluminescence polarization is gate independent. The observations are well explained as resulting from the continuous variation of orbital magnetic moments between positive and negative values through symmetry control.
AB - Crystal symmetry governs the nature of electronic Bloch states. For example, in the presence of time-reversal symmetry, the orbital magnetic moment and Berry curvature of the Bloch states must vanish unless inversion symmetry is broken. In certain two-dimensional electron systems such as bilayer graphene, the intrinsic inversion symmetry can be broken simply by applying a perpendicular electric field. In principle, this offers the possibility of switching on/off and continuously tuning the magnetic moment and Berry curvature near the Dirac valleys by reversible electrical control. Here we investigate this possibility using polarization-resolved photoluminescence of bilayer MoS 2 , which has the same symmetry as bilayer graphene but has a bandgap in the visible spectrum allowing direct optical probing. We find that in bilayer MoS 2 the circularly polarized photoluminescence can be continuously tuned from-15% to 15% as a function of gate voltage, whereas in structurally non-centrosymmetric monolayer MoS 2 the photoluminescence polarization is gate independent. The observations are well explained as resulting from the continuous variation of orbital magnetic moments between positive and negative values through symmetry control.
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DO - 10.1038/nphys2524
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Wu S, Ross JS, Liu GB, Aivazian G, Jones A, Fei Z et al. Electrical tuning of valley magnetic moment through symmetry control in bilayer MoS 2 Nature Physics. 2013 Mar;9(3):149-153. doi: 10.1038/nphys2524