Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M58: GMAG: Light Matter Interaction
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 302
Sponsoring
Unit:
GMAG
Chair: Zachary Morgan, Oak Ridge National Lab
Abstract: M58.00005 : Magnetically correlated defects in a quasi-1D electronic van der Waals magnetic semiconductor*
9:36 AM–9:48 AM
Presenter:
Julian Klein
(Massachusetts Institute of Technology)
Authors:
Julian Klein
(Massachusetts Institute of Technology)
Zhigang Song
(Harvard John A. Paulson School Of Engineering And Applied Sc)
Benjamin Pingault
(Harvard University)
Florian Dirnberger
(The City College of New York)
Hang Chi
(Massachusetts Institute of Technology)
Jonathan Curtis
(Harvard)
Rami Dana
(Massachusetts Institute of Technology)
Rezlind Bushati
(City College of New York)
Jiamin Quan
(University of Texas at Austin)
Lukas Dekanovsky
(Department of Inorganic Chemistry, University of Chemistry and Technology Prague)
Zdenek Sofer
(Department of Inorganic Chemistry, University of Chemistry and Technology Prague)
Andrea Alu
(The City College of New York)
Vinod M Menon
(The City College of New York)
Jagadeesh S Moodera
(Massachusetts Institute of Technology MIT)
Marko Lon?ar
(Harvard)
Prineha Narang
(Harvard)
Frances M Ross
(Massachusetts Institute of Technology MIT)
Here, we show optically active defects in CrSBr that are correlated with the magnetic phase diagram. Optical emission properties in multilayer samples are excellent with 1 meV linewidth owing to a quasi-1D electronic structure. We study the defect density and type in scanning probe microscopy and characterize the emission properties in low-temperature photoluminescence (PL) and photoluminescence excitation spectroscopy. In magneto-PL, the defect emission energies are a fingerprint of the magnetic order, but with absolute shifts up to 100 times weaker than the exciton, further highlighting the layer-localized nature of the defect wave function. Moreover, a magnetic phase at low temperature correlates with a strong narrowing of the defect emission, suggesting a change in the spin of the involved bands of the defect transition.
We conclude that CrSBr is an exciting platform for investigating optically active defects that are correlated with the magnetic phase diagram. This opens several novel avenues for tailor-made complex magnetic phases with direct optical access.
*J.K. acknowledges support by the Alexander von Humboldt foundation. F.M.R. acknowledge the funding from the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0019336 for STEM characterization.
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