Enhanced room-temperature spin-valley coupling in V-doped MoS2
| Autor: | Krishna Rani Sahoo, Janmey Jay Panda, Sumit Bawari, Rahul Sharma, Dipak Maity, Ashique Lal, Raul Arenal, G. Rajalaksmi, Tharangattu N. Narayanan |
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| Přispěvatelé: | Department of Atomic Energy (India), Science and Engineering Research Board (India), Department of Science and Technology (India), Universidad de Zaragoza, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Gobierno de Aragón, European Commission, Diputación General de Aragón |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) |
| Popis: | Achieving room-temperature valley polarization in two-dimensional (2D) atomic layers (2D materials) by substitutional doping opens new avenues of applications. Here, monolayer MoS2, when doped with vanadium at low (0.1 atomic %) concentrations, is shown to exhibit high spin-valley coupling, and hence a high degree of valley polarization at room-temperature. The atomic layers of MoS2 (MS) and V-doped MoS2 (VMS) are grown via the chemical vapor deposition-assisted method. The formation of new energy states near the valence band is confirmed from band gap calculations and also from the density functional theory–based band structure analyses. Time-reversal symmetry broken energy shift in the equivalent valleys is predicted in VMS, and the room-temperature chirality-controlled photoluminescent (PL) excitation measurements indicate such a shift in valley exciton energies (∼35 meV). An enhanced valley polarization in VMS (∼42%) is observed in comparison to that in MS ( Authors from Tata Institute of Fundamental Research appreciate the support of the Department of Atomic Energy, Government of India (Project Identification No. RTI 4007). T.N.N. and G.R. acknowledge the financial support from DST-SERB, Government of India SUPRA scheme (Grant No. SPR/2020/000220). The TEM and XPS studies were performed in the Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, Spain. The authors thank G. Antorrena (LMA) for the XPS measurements. R.A. acknowledges support from Spanish MICINN (Grant No. PID2019-104739GB-100/AEI/10.13039/501100011033), the Government of Aragon (projects DGA E13-20R; FEDER, EU), and from the European Union H2020 programs “ESTEEM3” (Grant No. 823717) and Graphene Flagship (Grant No. 881603). |
| Databáze: | OpenAIRE |
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