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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:4
UID:UW-Physics-Event-8598
DTSTART:20241024T150000Z
DTEND:20241024T230000Z
DTSTAMP:20260413T170703Z
LAST-MODIFIED:20240412T133753Z
LOCATION:5310 Chamberlin
SUMMARY:In-situ twisting and imaging of moiré superlattices\, R. G. H
 erb Condensed Matter Seminar\, Monica Allen\, UCSD
DESCRIPTION:Moiré superlattices\, which form in twisted stacks of 2D

 \nmaterials\, constitute a versatile platform for the exploration of
\
 ntopological and correlated phenomena. Here we present a route to
\nme
 chanically tune the twist angle of individual atomic layers with a
\np
 recision of a fraction of a degree inside a scanning probe
\nmicroscop
 e\, which enables continuous control of the electronic band
\nstructur
 e in-situ. In twisted bilayer graphene\, we demonstrate
\nnanoscale co
 ntrol of the moiré wavelength via mechanical rotation\, as
\nrevealed
  using piezoresponse force microscopy. We also extend this
\nmethodolo
 gy to create twistable boron nitride devices\, enabling
\ndynamic cont
 rol of the ferroelectric domain structure. This approach
\nprovides a 
 route for real-time manipulation of moiré materials\, which
\nmay all
 ow for systematic investigation of the phase diagrams at
\nmultiple an
 gles in a single device. Looking forward\, we will also
\ndiscuss prog
 ress on the construction of a new milliKelvin microwave
\nimpedance mi
 croscope in a dilution refrigerator\, which supports
\nspatially-resol
 ved detection of topological states in the GHz regime.
\nAs an applica
 tion\, I will briefly discuss the imaging of edge modes in
\na Chern i
 nsulator.
URL:https://www.physics.wisc.edu/events/?id=8598
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