Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.247701
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Funding
- ITN Spin-NANO Marie Sklodowska-Curie Grant [676108]
- Graphene Flagship
- National Center of Competence in Research on Quantum Science and Technology (NCCR QSIT) - Swiss National Science Foundation
- National Research Development and Innovation Office of Hungary within the Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]
- ELTE Excellence Program [783-3/2018/FEKUTSRAT]
- DFG via FLAG-ERA project iSpinText
- Elemental Strategy Initiative
- JSPS KAKENHI [JP15K21722]
- Marie Curie Actions (MSCA) [676108] Funding Source: Marie Curie Actions (MSCA)
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The strong spin-orbit coupling and the broken inversion symmetry in monolayer transition metal dichalcogenides results in spin-valley coupled band structures. Such a band structure leads to novel applications in the fields of electronics and optoelectronics. Density functional theory calculations as well as optical experiments have focused on spin-valley coupling in the valence band. Here we present magnetotransport experiments on high-quality n-type monolayer molybdenum disulphide (MoS2) samples, displaying highly resolved Shubnikov-de Haas oscillations at magnetic fields as low as 2 T. We find the effective mass 0.7m(e), about twice as large as theoretically predicted and almost independent of magnetic field and carrier density. We further detect the occupation of the second spin-orbit split band at an energy of about 15 meV, i.e., about a factor of 5 larger than predicted. In addition, we demonstrate an intricate Landau level spectrum arising from a complex interplay between a density-dependent Zeeman splitting and spin- and valley-split Landau levels. These observations, enabled by the high electronic quality of our samples, testify to the importance of interaction effects in the conduction band of monolayer MoS2.
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