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Intrinsic quantized anomalous Hall effect in a moir\'e heterostructure

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arxiv 1907.00261 v1 pith:SR3HPRGD submitted 2019-06-29 cond-mat.str-el cond-mat.mes-hallcond-mat.mtrl-sci

M. Serlin , C. L. Tschirhart , H. Polshyn , Y. Zhang , J. Zhu , K. Watanabe , T. Taniguchi , L. Balents
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A. F. Young
This is my paper · ORCID
classification cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-sci
keywords hallmagneticeffectanomalousapproxintrinsicmoirquantized
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abstract

We report the observation of a quantum anomalous Hall effect in twisted bilayer graphene showing Hall resistance quantized to within .1\% of the von Klitzing constant $h/e^2$ at zero magnetic field.The effect is driven by intrinsic strong correlations, which polarize the electron system into a single spin and valley resolved moir\'e miniband with Chern number $C=1$. In contrast to extrinsic, magnetically doped systems, the measured transport energy gap $\Delta/k_B\approx 27$~K is larger than the Curie temperature for magnetic ordering $T_C\approx 9$~K, and Hall quantization persists to temperatures of several Kelvin. Remarkably, we find that electrical currents as small as 1~nA can be used to controllably switch the magnetic order between states of opposite polarization, forming an electrically rewritable magnetic memory.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Mapping the twist angle and unconventional Landau levels in magic angle graphene

    cond-mat.mes-hall 2019-08 conditional novelty 8.0 of 10

    Local twist-angle maps in magic-angle twisted bilayer graphene reveal 0.1-degree variations and gradients that generate unscreened electric fields and bulk quantum Hall edge states.

  2. Three-Dimensional Topological Twistronics

    cond-mat.mes-hall 2019-09 accept novelty 7.0 of 10

    A generalized Bloch theory for 3D chiral twisted stacks predicts twist-angle-tunable Weyl fermions, magic-angle velocity zeros in twisted graphite, and vortex-line-mode Weyl physics in twisted Weyl semimetals.

  3. Collective Excitations of Quantum Anomalous Hall Ferromagnets in Twisted Bilayer Graphene

    cond-mat.mes-hall 2019-08 conditional novelty 6.0 of 10

    A microscopic calculation shows that the quantum anomalous Hall ferromagnet in twisted bilayer graphene is stable against spin and valley magnons, and that valley wave fluctuations limit the ordering temperature.

  4. Flat Chern Band From Twisted Bilayer MnBi$_2$Te$_4$

    cond-mat.mes-hall 2019-08 conditional novelty 6.0 of 10

    A twisted bilayer of MnBi2Te4 is predicted to host an isolated flat Chern band at about one degree twist, offering a time-reversal-broken moire platform for correlated topological states.

  5. SU(4) Heisenberg model on the honeycomb lattice with exchange-frustrated perturbations: implications for twistronics and Mott insulators

    cond-mat.str-el 2019-08 conditional novelty 5.5 of 10

    A combined spin-wave and variational Monte Carlo study finds that a quantum spin-orbital liquid survives a wide range of Hund's coupling and bond-dependent perturbations around the SU(4) symmetric point of the honeyco...

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