Moiré magnetism

ORAL

Abstract

We introduce a general framework to study moiré structures of two-dimensional Van der Waals magnets using continuum field theory. The formalism eliminates quasiperiodicity and allows a full understanding of magnetic structures and their excitations. In particular, we analyze in detail twisted bilayers of Néel antiferromagnets on the honeycomb lattice. A rich phase diagram with non-collinear twisted phases is obtained, and spin waves are further calculated. Direct extensions to zig-zag antiferromagnets and ferromagnets are also presented. We anticipate the results and formalism presented to lead to a broad range of applications to both fundamental research and experiments.

*This work was supported by the Simons Collaboration on Ultra-Quantum Matter, grant 651440 from the Simons Foundation (LB, ZL), and by the DOE, Office of Science, Basic Energy Sciences under Award No. DE-FG02-08ER46524 (KH).

–

Presenters

  • Zhu-Xi Luo

    • Kavli Institute for Theoretical Physics, University of California, Santa Barbara

Authors

  • Kasra Hejazi

    • Physics Department, University of California, Santa Barbara

  • Zhu-Xi Luo

    • Kavli Institute for Theoretical Physics, University of California, Santa Barbara

  • Leon Balents

    • Kavli Institute for Theoretical Physics, University of California, Santa Barbara
    • University of California, Santa Barbara