Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS$_2$
| Autor: | Klein, Julian, Wierzbowski, Jakob, Soubelet, Pedro, Brumme, Thomas, Maschio, Lorenzo, Kuc, Agnieszka, Müller, Kai, Stier, Andreas V., Finley, Jonathan J. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Materials 6, 024002 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevMaterials.6.024002 |
| Popis: | Manipulating electronic interlayer coupling in layered van der Waals (vdW) materials is essential for designing opto-electronic devices. Here, we control vibrational and electronic interlayer coupling in bi- and trilayer 2H-MoS$_2$ using large external electric fields in a micro-capacitor device. The electric field lifts Raman selection rules and activates phonon modes in excellent agreement with ab-initio calculations. Through polarization resolved photoluminescence spectroscopy in the same device, we observe a strongly tunable valley dichroism with maximum circular polarization degree of $\sim 60\%$ in bilayer and $\sim 35\%$ in trilayer MoS$_2$ that are fully consistent with a rate equation model which includes input from electronic band structure calculations. We identify the highly delocalized electron wave function between the layers close to the high symmetry $Q$ points as the origin of the tunable circular dichroism. Our results demonstrate the possibility of electric field tunable interlayer coupling for controlling emergent spin-valley physics and hybridization driven effects in vdW materials and their heterostructures. Comment: Main manuscript: 10 pages, 4 figures ; Supplemental material: 14 pages, 9 figures |
| Databáze: | arXiv |
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