Large effective mass and interaction-enhanced Zeeman splitting of $K$-valley electrons in MoSe${}_2$

Abstract

We study the magnetotransport of high-mobility electrons in monolayer and bilayer MoSe${}_2$, which show Shubnikov-de Haas (SdH) oscillations and quantum Hall states in high magnetic fields. An electron effective mass of 0.8$m_e$ is extracted from the SdH oscillations' temperature dependence; $m_e$ is the bare electron mass. At a fixed electron density the longitudinal resistance shows minima at filling factors (FFs) that are either predominantly odd, or predominantly even, with a parity that changes as the density is tuned. The SdH oscillations are insensitive to an in-plane magnetic field, consistent with an out-of-plane spin orientation of electrons at the $K$-point. We attribute the FFs parity transitions to an interaction enhancement of the Zeeman energy as the density is reduced, resulting in an increased Zeeman-to-cyclotron energy ratio.

arXiv comment5 pages, 5 figures; includes supplemental material

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• Strongly correlated excitonic insulator in atomic double layers
• Signatures of bilayer Wigner crystals in a transition metal dichalcogenide heterostructure
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• Spin-layer locking of interlayer excitons trapped in moiré potentials
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• Accessing high optical quality of MoS2 monolayers grown by chemical vapor deposition
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• Odd- and even-denominator fractional quantum Hall states in monolayer WSe${}_2$
• Charge-transfer Contact to a High-Mobility Monolayer Semiconductor
• Nonlinear quantum optics with trion-polaritons in 2D monolayers: conventional and unconventional photon blockade
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• Reliable postprocessing improvement of van der Waals heterostructures
• Exciton states in monolayer MoSe2 and MoTe2 probed by upconversion spectroscopy
• Optical signatures of charge order in a Mott-Wigner state
• Charge-order-enhanced capacitance in semiconductor moiré superlattices
• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• Nanoscale trapping of interlayer excitons in a 2D semiconductor heterostructure
• Moiré-trapped interlayer trions in a charge-tunable WSe${}_2$/MoSe${}_2$ heterobilayer
• Electrically controlled emission from singlet and triplet exciton species in atomically thin light emitting diodes
• Probing Landau levels of strongly interacting massive Dirac electrons in layer-polarized MoS${}_2$
• Absence of inter-layer tunnel coupling of $K$-valley electrons in bilayer MoS${}_2$
• Landau-quantized excitonic absorption and luminescence in a monolayer valley semiconductor
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• Electron recoil effect in electrically tunable MoSe2 monolayers
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• Strong-coupling phases of trions and excitons in electron-hole bilayers at commensurate densities
• Benchmarking exchange-correlation potentials with the mstar60 dataset: Importance of the nonlocal exchange potential for effective mass calculations in semiconductors
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• Long-lived Topological Flatband Excitons in Semiconductor Moiré Heterostructures: a Bosonic Kane-Mele Model Platform
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• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Crystal Phases of Charged Interlayer Excitons in van der Waals Heterostructures
• Optical detection of long electron spin transport lengths in a monolayer semiconductor
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• Electron transport in dual-gated three-layer MoS${}_2$
• Phase Slips and Parity Jumps in Quantum Oscillations of Inverted InAs/GaSb Quantum Wells
• Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe${}_2$
• Local noise spectroscopy of Wigner crystals in two-dimensional materials
• Scanning gate microscopy mapping of edge current and branched electron flow in a transition metal dichalcogenide nanoribbon and quantum point contact
• Effect of intravalley and intervalley electron-hole exchange on the nonlinear optical response of monolayer MoSe${}_2$
• Magnetic-Field-Induced Wigner Crystallization of Charged Interlayer Excitons in van der Waals Heterostructures
• Quantum melting of generalized electron crystal in twisted bilayer MoSe2
• Melting of electronic and excitonic crystals in 2D semiconductor moiré patterns: a perspective from the Lindemann criterion
• Exchange-enhanced spin-orbit splitting and its density dependence for electrons in monolayer transition metal dichalcogenides
• Fabrication and characterization of InSb nanosheet/hBN/graphite heterostructure devices
• Intrinsic Electronic Properties of BN Encapsulated, van der Waals Contacted MoSe${}_2$ FETs
• Quantum oscillations in a hexagonal boron nitride-supported single crystalline InSb nanosheet
• Apparent inconsistency between Streda formula and Hall conductivity in reentrant integer quantum anomalous Hall effect in twisted MoTe${}_2$
• Density-dependent spin susceptibility and effective mass in monolayer MoSe2
• Anomalous Landau level gaps near magnetic transitions in monolayer WSe${}_2$
• Exciton localization on p-i-n junctions in two-dimensional crystals