Valley-dependent optoelectronics from inversion symmetry breaking
By W. Yao, Di Xiao, Q. Niu. 2007
768 citations recorded by the source corpus.
Inversion symmetry breaking allows contrasted circular dichroism in different $k$-space regions, which takes the extreme form of optical selection rules for interband transitions at high symmetry points. In materials where band edges occur at noncentral valleys, this enables valley-dependent interplay of electrons with light of different circular polarizations, in analogy to spin dependent optical activities in semiconductors. This discovery is in perfect harmony with the previous finding of valley contrasted Bloch band features of orbital magnetic moment and Berry curvatures from inversion symmetry breaking [D. Xiao, W. Yao, and Q. Niu, Phys. Rev. Lett. 99, 236809 (2007)]. A universal connection is revealed between the $k$-resolved optical oscillator strength of interband transitions, the orbital magnetic moment and the Berry curvatures, which also provides a principle for optical measurement of orbital magnetization and intrinsic anomalous Hall conductivity in ferromagnetic systems. The general physics is demonstrated in graphene where inversion symmetry breaking leads to valley contrasted optical selection rule for interband transitions. We discuss graphene based valley optoelectronics applications where light polarization information can be interconverted with electronic information.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/c338842f73d45f350a360bd7046b3c6d558b3445
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Citations in the corpus
- Magnetic control of valley pseudospin in monolayer WSe2 (2014, methodology): “rac model To the leading order approximation, the conduction and valence band edges are described by the massive Dirac fermion model and possess identical effective masses and valley magnetic moments [S1], which lead to identical Zeeman shifts of the conduction and valence bands. Thus for the Zeeman”
- Valley excitons in two-dimensional semiconductors (2015, background): “Interestingly, the interband optical transition in monolayer TMDs is associated with a valley selection rule originated from the three-fold rotational symmetry of the 2D lattice [25,26], such that the valley configurations of the bright excitons directly correspond to the circular polarization of th”
- Giant and tunable valley degeneracy splitting in MoTe2 (2015, background): “Dynamical polarization of monolayer MX2 has been achieved by circularly polarized optical pumping, [8–11] based on valley-selective circular dichroism; that is, the interband transitions at two valleys exclusively absorb the left- and rightpolarized photon, respectively [4, 8, 9].”
- Very large Dzyaloshinskii-Moriya interaction in two-dimensional Janus manganese dichalcogenides and its application to realize skyrmion states (2019, background): “symmetric such that the DMI is absent in these structures. It is possible to break the inversion symmetry by modifying the substrate, combing different 2D materials, applying a bias voltage or strain [25, 26]. However, the simplest and most desirable situation should be a 2D magnet with intrinsic br”