Odd- and even-denominator fractional quantum Hall states in monolayer WSe${}_2$

Abstract

Monolayer (ML) semiconducting transition-metal dichalcogenides (TMDs) represent a unique class of two-dimensional (2D) electron systems. Their atomically thin structure -- just like graphene -- facilitates gate-tunability, while the sizable band gap and strong spin-orbit coupling hold promise for properties beyond graphene. Measurements under large magnetic fields have revealed an unusual LL structure, distinct from other 2D electron systems. However, owing to limited sample quality and poor electrical contact, probing the lowest Landau levels (LLs) has been challenging, and observation of electron correlations within the fractionally filled LLs regime has not been possible. Here, through bulk electronic compressibility measurements, we investigate the LL structure of ML WSe${}_2$ in the extreme quantum limit, and observe fractional quantum Hall (FQH) states in the lowest three LLs. The odd-denominator FQH sequences demonstrate a systematic evolution with the LL orbital index, which has not been observed in any other system but is consistent with generic theoretical expectations. In addition, we observe an even-denominator state in the second LL that is expected to host non-Abelian statistics. Our results suggest that the 2D semiconductors can provide an experimental platform that closely resembles idealized theoretical models in the quantum Hall regime.

typos in v1 corrected

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Cited by in corpus (48)

• Stripe phases in WSe2/WS2 moiré superlattices
• Ultra-high quality two-dimensional electron systems
• Fractional charge and fractional statistics in the quantum Hall effects
• Aharonov Bohm Effect in Graphene Fabry Pérot Quantum Hall Interferometers
• Charge-transfer Contact to a High-Mobility Monolayer Semiconductor
• Valley Isospin Controlled Fractional Quantum Hall States in Bilayer Graphene
• Charge Transfer Excitations, Pair Density Waves, and Superconductivity in Moiré Materials
• Charge-order-enhanced capacitance in semiconductor moiré superlattices
• Bilayer WSe${}_2$ as a natural platform for interlayer exciton condensates in the strong coupling limit
• Non-Abelian fractionalization in topological minibands
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Tunable spin and valley excitations of correlated insulators in $\Gamma$-valley moiré bands
• Interplay between fractional quantum Hall liquid and crystal phases at low filling
• Realization of supersymmetry and its spontaneous breaking in quantum Hall edges
• Two-dimensional natural hyperbolic materials: From polaritons modulation to applications
• Energy gap of the even-denominator fractional quantum Hall state in bilayer graphene
• High-Resolution Tunneling Spectroscopy of Fractional Quantum Hall States
• Tracing non-Abelian anyons via impurity particles
• Topological phase transition between composite-fermion and Pfaffian daughter states near ν = 1/2 FQHS
• Electronic transport, metal-insulator transition, and Wigner crystallization in transition metal dichalcogenide monolayers
• Fractional Quantum Hall State at Filling Factor $\nu =1/4$ in Ultra-High-Quality GaAs 2D Hole Systems
• Valley-Filling Instability and Critical Magnetic Field for Interaction-Enhanced Zeeman Response in Doped WSe${}_2$ Monolayers
• Solving and visualizing fractional quantum Hall wavefunctions with neural network
• Evidence for a Superfluid-to-solid Transition of Bilayer Excitons
• Quarter- and half-filled quantum Hall states and their topological orders revealed by daughter states in bilayer graphene
• Signature of spin-resolved quantum point contact in p-type trilayer WSe${}_2$ van der Waals heterostructure
• Local density of states and particle entanglement in topological quantum fluids
• Fingerprints of anti-Pfaffian topological order in quantum point contact transport
• Benchmarking the integration of hexagonal boron nitride crystals and thin films into graphene-based van der Waals heterostructures
• Spin-valley relaxation dynamics of Landau-quantized electrons in MoSe${}_2$ monolayer
• Fractional quantum Hall effect at the filling factor $\nu =5/2$
• Highly-Anisotropic Even-Denominator Fractional Quantum Hall State in an Orbitally-Coupled Half-Filled Landau Level
• Magneto-optical conductivity of monolayer transition metal dichalcogenides in the presence of proximity-induced exchange interaction and external electrical field
• Ultraclean two-dimensional hole systems with mobilities exceeding 10${}^7$ cm${}^2$/Vs
• Aharonov-Bohm Interference in Even-Denominator Fractional Quantum Hall States
• Interacting holes in a gated WSe${}_2$ quantum channel: valley correlations and zigzag Wigner crystal
• Developing fractional quantum Hall states at $\nu$ = $\frac{1}{7}$ and $\frac{2}{11}$ in the presence of significant Landau level mixing
• Fractional quantum Hall state at $\nu =1/2$ with energy gap up to 6 K, and possible transition from one- to two-component state
• Negative longitudinal resistance of monolayer graphene in the quantum Hall regime
• Electron density control in tungsten diselenide monolayers via photochlorination
• Magnetic Hofstadter cascade in a twisted semiconductor homobilayer
• Density-dependent spin susceptibility and effective mass in monolayer MoSe2
• Even-denominator fractional quantum Hall states with spontaneously broken rotational symmetry
• Interlayer exciton condensates between second Landau level orbitals in double bilayer graphene
• Cascade of fractional quantum Hall states in 2D system
• Impact of in-situ controlled disorder screening on fractional quantum Hall effects and composite-fermion transport
• Topological states in double monolayer graphene
• Anomalous Landau level gaps near magnetic transitions in monolayer WSe${}_2$