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Determining Interaction Enhanced Valley Susceptibility in Spin-Valley-Locked MoS2
Jiangxiazi Lin1, Tianyi Han1, Benjamin A Piot2
1Department of Physics and Center for Quantum Materials , The Hong Kong University of Science and Technology , Clear Water Bay , Hong Kong , China.
Strong interactions in molybdenum disulfide (MoS2) reveal quantum Hall Ising ferromagnets. These findings explore many-body effects in massive Dirac electrons, crucial for future electronic systems.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanoscience
Background:
- Two-dimensional transition metal dichalcogenides (TMDCs) exhibit unique electronic properties like spin-valley locking and superconductivity.
- Reduced dimensionality in TMDCs leads to unconventional many-body interaction effects.
Purpose of the Study:
- To investigate strong interaction effects in the conduction band of molybdenum disulfide (MoS2).
- To explore the behavior of massive Dirac electrons in high-quality MoS2 samples.
Main Methods:
- Transport experiments on high-quality MoS2 samples with high field-effect mobilities.
- Identification of valley-resolved Landau levels (LLs) and polarized LLs using the Lifshitz-Kosevitch formula.
- Analysis of LL crossings in the Landau fan diagram to determine valley susceptibility and g-factor.
Main Results:
- Unambiguous determination of density-dependent valley susceptibility and interaction-enhanced g-factor (12.7 to 23.6).
- Discovery of LL anticrossings indicating the formation of quantum Hall Ising ferromagnets.
- Demonstration of reversible valley polarization by tuning density or in-plane magnetic field.
Conclusions:
- Provides strong evidence for many-body interaction effects in the MoS2 conduction band.
- Establishes MoS2 as a platform for exploring strongly correlated phenomena in massive Dirac electrons.
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