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Time-reversal symmetry breaking fractional quantum spin Hall insulator in moir\'e MoTe2
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Twisted bilayer transition metal dichalcogenide semiconductors, which support flat Chern bands with enhanced interaction effects, realize a platform for fractional Chern insulators and fractional quantum spin Hall (FQSH) insulators. A recent experiment has reported the emergence of a FQSH insulator protected by spin-Sz conservation at a moir\'e lattice filling factor {\nu}=3 in 2.1-degree twisted bilayer MoTe2. Theoretical studies have proposed both time-reversal symmetric and asymmetric ground states as possible candidates for the observed FQSH insulator, but the nature of the state remains unexplored. Here we report the observation of spontaneous time-reversal symmetry breaking at generic fillings in 2.1-degree twisted bilayer MoTe2 from {\nu}<1 all the way to {\nu}>6 except at {\nu}=2, 4, and 6. Although zero Hall response is observed at {\nu}=3 for magnetic fields higher than 20 mT, a finite anomalous Hall response accompanied by a magnetic hysteresis is observed at lower magnetic fields, demonstrating spontaneous time-reversal symmetry breaking. Our work shows the tendency towards ferromagnetism by doping the first three pairs of conjugate Chern bands in the material; it also sheds light on the nature of the FQSH insulator at {\nu}=3.
Forward citations
Cited by 5 Pith papers
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Trial wavefunction for fractional quantum spin Hall insulators
A new variational Z_4 FQSH trial wavefunction is constructed via anyonic exciton condensation in conjugate Landau levels and shown energetically favorable over alternatives via spherical Monte Carlo.
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A new projection technique in continuum moiré models yields chiral, layer-polarized edge states in twisted WSe2 nanoribbons that match bulk Chern numbers and are electrically tunable.
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Wilson-Loop-Ideal Bands and General Idealization
Introduces Wilson-loop-ideal bands saturating the quantum metric Wilson-loop bound and a general monotonic flow construction applied to moiré models to achieve low-error ideal states for correlated physics.
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Probing bilayer topological order with layer-resolved transport
A new protocol for layer-resolved transport measurements that extracts anyon statistics from charge distribution across layers in multi-component topological states.
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Band mixing and particle-hole asymmetry in moir\'e fractional Chern insulators
Remote band mixing in moiré models preferentially stabilizes electron Wigner crystals over hole crystals, explaining the greater instability of fractional Chern insulators at ν=1/3 than at ν=2/3.
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