Interactions and magnetotransport through spin-valley coupled Landau levels in monolayer MoS${}_2$

Abstract

The strong spin-orbit coupling and the broken inversion symmetry in monolayer transition metal dichalcogenides (TMDs) 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 (MoS${}_2$) samples, displaying highly resolved Shubnikov-de Haas oscillations at magnetic fields as low as $2T$. 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 $15meV$, i.e. about a factor $5$ 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 MoS${}_2$.

arXiv commentPhys.Rev.Lett. (2018)

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• Quantum Hall Effect of Weyl Fermions in Semiconducting n-type Tellurene
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• Accessing high optical quality of MoS2 monolayers grown by chemical vapor deposition
• Odd- and even-denominator fractional quantum Hall states in monolayer WSe${}_2$
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• Reliable postprocessing improvement of van der Waals heterostructures
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• Measurement of Conduction and Valence Bands g-factors in a Transition Metal Dichalcogenide Monolayer
• Band filling and cross quantum capacitance in ion gated semiconducting transition metal dichalcogenide monolayers
• Fine structure of $\mathrm{K}$-excitons in multilayers of transition metal dichalcogenides
• Probing Landau levels of strongly interacting massive Dirac electrons in layer-polarized MoS${}_2$
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• 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
• Transport of neutral optical excitations using electric fields
• Theory of moiré localized excitons in transition-metal dichalcogenide heterobilayers
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• First-order magnetic phase-transition of mobile electrons in monolayer MoS${}_2$
• Spontaneous valley polarization of interacting carriers in a monolayer semiconductor
• Substrate influence on transition metal dichalcogenide monolayer exciton absorption linewidth broadening
• Valley two-qubit system in a MoS${}_2$-monolayer gated double quantum dot
• Superconducting contacts to a monolayer semiconductor
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Even-integer Quantum Hall Effect in an Oxide Caused by Hidden Rashba Effect
• Atomistic $T$-matrix theory of disordered 2D materials: Bound states, spectral properties, quasiparticle scattering, and transport
• Substrate-controlled dynamics of spin qubits in low dimensional van-der-Waals materials
• Optical properties of exciton in two-dimensional transition metal dichalcogenide nanobubbles
• Benchmarking exchange-correlation potentials with the mstar60 dataset: Importance of the nonlocal exchange potential for effective mass calculations in semiconductors
• Intervalley Polaron in Atomically Thin Transition Metal Dichalcogenides
• Exchange Intervalley Scattering And Magnetic Phase Diagram Of Transition Metal Dichalcogenide Monolayers
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Non-Destructive Low-Temperature Contacts to MoS2 Nanoribbon and Nanotube Quantum Dots
• Coulomb Blockade Spectroscopy of a ${\mathrm{MoS}}_2$ Nanotube
• Optical detection of long electron spin transport lengths in a monolayer semiconductor
• Signature of spin-resolved quantum point contact in p-type trilayer WSe${}_2$ van der Waals heterostructure
• Electron transport in dual-gated three-layer MoS${}_2$
• Phase Slips and Parity Jumps in Quantum Oscillations of Inverted InAs/GaSb Quantum Wells
• Optical flux pump in the quantum Hall regime
• Evidence of the Coulomb gap in the density of states of MoS${}_2$
• Effective low energy Hamiltonians and unconventional Landau level spectrum of monolayer C${}_3$N
• Scanning gate microscopy mapping of edge current and branched electron flow in a transition metal dichalcogenide nanoribbon and quantum point contact
• Magneto-optical conductivity of monolayer transition metal dichalcogenides in the presence of proximity-induced exchange interaction and external electrical field
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Magnetic phase transitions in two-dimensional two-valley semiconductors with in-plane magnetic field
• SQUID pattern disruption in transition metal dichalcogenide Josephson junctions due to non-parabolic dispersion of the edge states
• De Haas-van Alphen effect in graphene
• Exchange-enhanced spin-orbit splitting and its density dependence for electrons in monolayer transition metal dichalcogenides
• Density-dependent spin susceptibility and effective mass in monolayer MoSe2
• High magnetic field spin-valley-split Shubnikov-de Haas oscillations in a WSe${}_2$ monolayer
• Landau-Level Quantization and Band Splitting of FeSe Monolayers Revealed by Scanning Tunneling Spectroscopy
• Resistively detected electron spin resonance and g-factor in few-layer exfoliated MoS2 devices
• Fine structure of negatively charged and neutral excitons in monolayer MoS${}_2$
• Anomalous Landau level gaps near magnetic transitions in monolayer WSe${}_2$