Strong cavity-pseudospin coupling in monolayer transition metal dichalcogenides
| Autor: | Amrit De, Roger K. Lake |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Rabi cycle Spintronics Condensed matter physics Exciton 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Magnetic field symbols.namesake law Optical cavity 0103 physical sciences Monolayer symbols 010306 general physics 0210 nano-technology Hamiltonian (quantum mechanics) Circular polarization |
| Zdroj: | Physical Review B. 96 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.96.035436 |
| Popis: | Strong coupling between the electronic states of monolayer transition metal dichalcogenides (TMDCs) such as ${\mathrm{MoS}}_{2},{\mathrm{MoSe}}_{2},{\mathrm{WS}}_{2}$, or ${\mathrm{WSe}}_{2}$, and a single in-plane optical cavity mode gives rise to valley- and spin-dependent cavity-QED effects. The Dirac Hamiltonian for this two-dimensional gapped semiconductor with large spin-orbit coupling facilitates pure Jaynes-Cummings-type coupling with spin-valley locking---providing an additional handle for spintronics using circularly polarized light. Besides being an on-chip light source, the strong cavity coupling causes the TMDC monolayer to act as a spontaneous spin oscillator. In addition, this system can be a sensitive magnetic field sensor for an in-plane magnetic field. It also displays unusual persistent Rabi oscillations between different conduction-band states that are insensitive to small magnetic field variations. Our analysis for dissipation due to finite exciton relaxation times and cavity losses suggests that these effects are observable. |
| Databáze: | OpenAIRE |
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