Valleytronics on the Surface of Topological Crystalline Insulator: Elliptic Dichroism and Valley-Selective Optical Pumping
arXiv:1401.0273 · doi:10.1103/PhysRevB.89.195413
Abstract
The low-energy theory of the surface of the topological crystalline insulator (TCI) is characterized by four Dirac cones anisotropic into the and directions. Recent experiments have shown that the band gap can be introduced in these Dirac cones by crystal distortion by applying strain to the crystal structure. The TCI surface provides us with a new way to valleytronics when gaps are given to Dirac cones. Indeed the system has the Chern number and three valley-Chern numbers. We investigate the optical absorption on the TCI surface. It shows a strong elliptic dichroism though the four Dirac cones have the same chiralities. Namely, it is found that the absorptions of the right- and left-polarized light are different, depending on the sign of mass and the location of the Dirac cones, owing to the anisotropy of the Dirac cone. By measuring this elliptic dichroism it is possible to determine the anisotropy of a Dirac cone experimentally.
6 pages, 5 figures
References in corpus (10)
- Valley polarization in MoS2 monolayers by optical pumping
- Topological Crystalline Insulators
- Valley filter and valley valve in graphene
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
- Coupling the valley degree of freedom to antiferromagnetic order
- Spin-Valleytronics in Silicene: Quantum-Spin-Quantum-Anomalous Hall Insulators and Single-Valley Semimetals
- Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene
- Optical Signatures of the Tunable Band Gap and Valley-Spin Coupling in Silicene
- Spin-polarized (001) surface states of the topological crystalline insulator Pb_{0.73}Sn_{0.27}Se
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