Momentum selective optical absorption in triptycene molecular membrane
arXiv:2002.03116 · doi:10.1103/PhysRevB.101.085418
Abstract
The optical properties of triptycene molecular membranes (TMMs) under the linearly and circularly polarized light irradiation have been theoretically studied. Since TMMs have the double-layered Kagome lattice structures for their -electrons, i.e., tiling of trigonal and hexagonal-symmetric rings, the electronic band structures of TMMs have non-equivalent Dirac cones and perfect flat bands. By constructing the tight-binding model to describe the pi-electronic states of TMMs, we have evaluated the optical absorption intensities and valley selective excitation of TMMs based on the Kubo formula. It is found that absorption intensities crucially depend on both light polarization angle and the excitation position in momentum space, i.e., the momentum and valley selective optical excitation. The polarization dependence and optical selection rules are also clarified by using group theoretical analyses.
11 pages, 6 figures
References in corpus (24)
- The electronic properties of graphene
- Two-Dimensional Gas of Massless Dirac Fermions in Graphene
- Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Boron nitride substrates for high-quality graphene electronics
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Valley polarization in MoS2 monolayers by optical pumping
- Valley contrasting physics in graphene: magnetic moment and topological transport
- The Valley Hall Effect in MoS2 Transistors
- Valley filter and valley valve in graphene
- Spin Liquid Ground State of the Kagome Heisenberg Model
- Higher-order topological insulators and semimetals on the breathing Kagome and pyrochlore lattices
- Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
- Topological insulator on the kagome lattice
- Graphene valley filter using a line defect
- Robust optical emission polarization in MoS2 monolayers through selective valley excitation
- Vapor-Solid Growth of High Optical Quality MoS2 Monolayers With Near-Unity Valley Polarization
- Topological phase transitions driven by next-nearest-neighbor hopping in two-dimensional lattices
- Topological states on the breathing kagome lattice
- Valley separation in graphene by polarized light
- Topological Invariants for Polyacetylene, Kagome and Pyrochlore lattices
- Simulating and Detecting the Quantum Spin Hall Effect in Kagomé Optical Lattice
- Valley polarization induced second harmonic generation in graphene
- Spin Hall effect in the kagome lattice with Rashba spin-orbit interaction