Optical valleytronics of impurity states in two-dimensional Dirac materials
| Autor: | Dogyun Ko, Ivan Savenko, Alexey V. Morozov, V. M. Kovalev |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Spinor Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Dirac (software) FOS: Physical sciences 02 engineering and technology Electron Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences Brillouin zone Impurity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Valleytronics Electric current 010306 general physics 0210 nano-technology Wave function Physics - Optics Optics (physics.optics) |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We analyze the valley selection rules for optical transitions from impurity states to the conduction band in two-dimensional Dirac materials, taking a monolayer of MoS2 as an example. We employ the analytical model of a shallow impurity potential which localizes electrons described by a spinor wave function, and, first, find the system eigenstates taking into account the presence of two valleys in the Brillouin zone. Then, we find the spectrum of the absorbance and calculate the photon-drag electric current due to the impurity-band transitions, drawing the general conclusions regarding the valley optical selection rules for the impurity-band optical transitions in gapped Dirac materials. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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