Interplay between topology and correlations in the second moiré band of twisted bilayer MoTe2

Abstract

Topological flat bands formed in two-dimensional lattice systems offer unique opportunity to study the fractional phases of matter in the absence of an external magnetic field. Celebrated examples include fractional quantum anomalous Hall (FQAH) effects and fractional topological insulators. Recently, FQAH effects have been experimentally realized in both the twisted bilayer MoTe2 (tMoTe2) system and the rhombohedral stacked multilayer graphene/hBN moiré systems. To date, experimental studies mainly focus on the first moiré flat band, except a very recent work that studied novel transport properties in higher moiré bands of a 2.1° tMoTe2 device. Here, we present the systematical transport study of approximately 3° tMoTe2 devices, especially for the second moiré band. At ν = -2 and -4, time-reversal-symmetric single and double quantum spin Hall states formed, consistent with the previous observation in 2.1° tMoTe2 device. On the other hand, we observed ferromagnetism in the second moiré band, and a Chern insulator state driven by out-of-plane magnetic fields at ν = -3. At ν = -2.2 to -2.7, finite temperature resistivity minimum with 1/T scaling at low temperatures, and large out-of-plane negative magnetoresistance have been observed. Applying out-of-plane electric field can induce quantum phase transitions at both integer and fractional filling factors. Our studies pave the way for realizing tunable topological states and other unexpected magnetic phases beyond the first moiré flat band based on twisted MoTe2 platform.

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Cited by in corpus (22)

• Hidden States and Dynamics of Fractional Fillings in tMoTe2 Moiré Superlattices
• Visualizing the microscopic origins of topology in twisted molybdenum ditelluride
• Observation of Ferromagnetic Phase in the Second Moiré Band of Twisted MoTe2
• Broken Symmetry in Ideal Chern Bands
• Chiral superconductivity from spin polarized Chern band in twisted MoTe${}_2$
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Topological magnons and domain walls in twisted bilayer MoTe${}_2$
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Mean-field Modelling of Moiré Materials: A User's Guide with Selected Applications to Twisted Bilayer Graphene
• Density-dependent spin susceptibility and effective mass in monolayer MoSe2
• Variational wavefunctions for fractional topological insulators
• Optical signatures of -1/3 fractional quantum anomalous Hall state in twisted MoTe2
• Chern-Selective multi-valley Flat Bands in Twisted Mono-Bilayer and Mono-Trilayer MoTe${}_2$
• Sensing the binding and unbinding of anyons at impurities
• Probing Quantum Anomalous Hall States in Twisted Bilayer WSe2 via Attractive Polaron Spectroscopy
• Quantum science with arrays of metastable helium-3 atoms
• Tuning between a fractional topological insulator and competing phases at ${\nu }_{\mathrm{T}}=2/3$
• Insulating charge transfer ferromagnetism
• Three-dimensional flat bands and possible interlayer triplet pairing superconductivity in the alternating twisted NbSe${}_2$ moiré bulk
• Doping-induced Quantum Anomalous Hall Crystals and Topological Domain Walls
• Symmetric localization of ${\nu }_{\text{tot}}=4/3$ fractional topological insulator edges
• Abelian and non-Abelian fractionalized states in twisted MoTe${}_2$: A generalized Landau-level theory