Optically Enhanced Magnetization by Exciton Recombination in an Atomically Thin Antiferromagnet
ORAL
Abstract
Two-dimensional (2D) semiconductors offer a unique platform for investigating the interplay between light and magnetization. Excitons are usually responsive probes of magnetic order, yet whether magnetic order responds to the presence of excitons is less frequently examined. In this work, we synchronize optical pumping of a 2D magnet to an ac sensing protocol on nitrogen-vacancy (NV) centers in diamond. Using this spatiotemporal-resolved magnetometry, we discover an enhancement of the magnetic moments in a few-layer van der waals antiferromagnet. Together with time-resolved photoluminescence measurements and density functional theory calculations, we infer that this enhancement arises from a defect-assisted Auger recombination, which involves localized excitons and drives electron hopping into the spin-polarized band. This study offers insights into defect engineering in 2D magnets and encourages the development of spintronic devices modulated by light.
*This work was primarily supported by NSF awards DMR-2047214, ECCS-2041779, and the Air Force Office of Scientific Research award FA2386-21-1-4095.
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Presenters
Xinyue Zhang
Boston College
Authors
Xinyue Zhang
Boston College
Yuxuan Wang
Boston College
Hyeonhu Bae
Weizmann Institute of Science
Thomas Graham
Boston College
Nazar Delegan
Argonne National Laboratory
Argonne
University of Chicago
Zhi-Cheng Wang
Boston College
Kenji Watanabe
National Institute for Materials Science
NIMS
Research Center for Electronic and Optical Materials, National Institute for Materials Science
Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
National Institute for Material Science
Takashi Taniguchi
Kyoto Univ
National Institute for Materials Science
Research Center for Materials Nanoarchitectonics
Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
National Institute for Materials Sciences
NIMS
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
National Institute for Material Science
International Center for Materials Nanoarchitectonics, NIMS, Japan
International Center for Materials Nanoarchitectonics, Tsukuba
National Institue for Materials Science
Kyoto University
National Institute of Materials Science
International Center for Materials Nanoarchitectonics and National Institute for Materials Science
