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X-WR-CALNAME:Physics Colloquium: Brian Zhou\, Boston College
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20261016T000424Z
UID:tag:localist.com\,2008:EventInstance_47233746372446
DTSTART:20241002T200000Z
DTEND:20241002T210000Z
DESCRIPTION:Revealing Condensed Matter Phenomena with Quantum Sensing\n\nTh
 e single electron spin of a defect in diamond known as the nitrogen-vacanc
 y (NV) center has emerged as a versatile nanoscale sensor for electromagne
 tic fields\, temperature\, and pressure\, capable of operation in extreme 
 environments and at diverse interfaces. In this talk\, I will highlight ou
 r group’s efforts to extend the scope of NV quantum sensing to new mater
 ials science phenomena\, such as dynamical magnetization responses and pho
 tocurrent\, particularly for atomically thin materials\, for which such me
 asurements are inaccessible by conventional probes. We demonstrate the qua
 ntitative detection of the ac magnetic susceptibility and optically-induce
 d\, transient magnetization dynamics for few-layer van der Waals magnets [
 1\,2]. Moreover\, we image the vector photocurrent flow density and discov
 er a hidden mechanism called the anisotropic photothermoelectric effect fo
 r photocurrent generation in the type-II Weyl semimetals WTe2 and TaIrTe4 
 [3]. Finally\, we exploit nanoscale-resolved imaging to elucidate exchange
  bias and control over antiferromagnetic domains through antiferromagnetic
 -ferromagnetic interfaces at intrinsic layer-parity junctions in a 2D magn
 et. These quantum-enabled perspectives stimulate the unique understanding 
 of quantum materials and new device archetypes for energy and information 
 technologies.\n\n1.    X.-Y. Zhang et al. ac susceptometry of 2D van der W
 aals magnets enabled by the coherent control of quantum sensors. PRX Quant
 um 2\, 030352 (2021).\n2.    X.-Y. Zhang et al. Enhanced magnetization by 
 defect-assisted exciton recombination in atomically thin CrCl3. Physical R
 eview Materials (2024).\n3.    Y.-X. Wang et al. Visualization of bulk and
  edge photocurrent flow in anisotropic Weyl semimetals. Nature Physics (20
 23).
LOCATION:Higgins Hall\, 310
SUMMARY:Physics Colloquium: Brian Zhou\, Boston College
URL;VALUE=URI:https://events.bc.edu/event/physics-colloquium-brian-zhou-bos
 ton-college
CATEGORIES:Lecture
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