Spin-Valleytronics in Silicene: Quantum-Spin-Quantum-Anomalous Hall Insulators and Single-Valley Semimetals

Abstract

Valley-based electronics, known as valleytronics, is one of the keys to break through to a new stage of electronics. The valley degree of freedom is ubiquitous in the honeycomb lattice system. The honeycomb lattice structure of silicon called silicene is an fascinating playground of valleytronics. We investigate topological phases of silicene by introducing different exchange fields on the $A$ and $B$ sites. There emerges a rich variety of topologically protected states each of which has a characteristic spin-valley structure. The single Dirac-cone semimetal is such a state that one gap is closed while the other three gaps are open, evading the Nielsen-Ninomiya fermion-doubling problem. We have newly discovered a hybrid topological insulator named the quantum-spin-quantum-anomalous Hall insulator, where the quantum anomalous Hall effect occurs at one valley and the quantum spin Hall effect occurs at the other valley. Along its phase boundary, single-valley semimetals emerge, where only one of the two valleys is gapless with degenerated spins. These semimetals are also topologically protected because they appear in the interface of different topological insulators. Such a spin-valley dependent physics will be observed by optical absorption or edge modes.

6 pages, 4 figures (to be published in Phys. Rev. B)

References in corpus (11)

• Valley polarization in MoS2 monolayers by optical pumping
• Valley filter and valley valve in graphene
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
• The Helical Liquid and the Edge of Quantum Spin Hall Systems
• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
• Photo-Induced Topological Phase Transition and a Single Dirac-Cone State in Silicene
• Coupling the valley degree of freedom to antiferromagnetic order
• Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene
• Topological Phase Transition and Electrically Tunable Diamagnetism in Silicene