Theoretical study of the photocurrent in transition-metal dichalcogenide materials
| Autor: | Hyun C. Lee |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Photocurrent
Materials science Condensed matter physics Condensed Matter::Other Physics::Optics Quantum Physics 02 engineering and technology Photon energy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Transition metal Hall effect 0103 physical sciences Perpendicular symbols 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) Spectroscopy Circular polarization |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.245102 |
| Popis: | Motivated by photocurrent spectroscopy experiments with $\mathrm{Mo}{\mathrm{S}}_{2}$, the direct band-to-band transition contribution to the photocurrent of transition-metal dichalcogenides is computed starting from the microscopic Hamiltonian in the Keldysh-Schwinger formalism. It turns out that the band tilting induced by source to drain voltage is necessary for a nonvanishing photocurrent. The photon energy dependence of the normalized photocurrent is found to be consistent with experimental data. For circular polarization the helicity-dependent component of the photocurrent perpendicular to the band-tilting direction is predicted, which essentially originates from the valley Hall effect. |
| Databáze: | OpenAIRE |
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