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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:4
UID:UW-Physics-Event-9724
DTSTART:20260917T150000Z
DTEND:20260917T160000Z
DTSTAMP:20260823T200822Z
LAST-MODIFIED:20260803T210722Z
LOCATION:5310 Chamberlin Hall
SUMMARY:The Atomic Single Electron Transistor\, R. G. Herb Condensed M
 atter Seminar\, Dahlia Klein\, University of Chicago
DESCRIPTION:Electrons in solids owe their properties to the periodic p
 otential landscapes they experience. The advent of moiré lattices has
  revolutionized our ability to engineer such landscapes on nanometer s
 cales\, leading to numerous groundbreaking discoveries. Despite this p
 rogress\, direct imaging of these electrostatic potential landscapes r
 emains elusive. Here\, we introduce the Atomic Single Electron Trans
 istor (SET)\, a novel scanning probe that uses a single atomic defec
 t in a van der Waals (vdW) material as an ultrasensitive\, high-resolu
 tion potential sensor. Built upon the quantum twisting microscope (QTM
 ) platform\, this probe leverages the QTM’s capability to form a pri
 stine\, scannable 2D interface between vdW heterostructures. Using the
  Atomic SET\, we present the first direct images of the electrostati
 c potential in a canonical moiré interface: graphene aligned to hexag
 onal boron nitride. This potential exhibits an approximate C_6 symmetr
 y\, minimal dependence on carrier density\, and a substantial magnitud
 e of ~60 mV even in the absence of carriers. Theory indicates that thi
 s symmetry arises from a delicate interplay of physical mechanisms wit
 h competing symmetries. Intriguingly\, the measured magnitude signific
 antly exceeds theoretical predictions\, suggesting that current unders
 tanding may be incomplete. With 1 nm spatial resolution and sensitivit
 y to potentials generated by only a few millionths of an electron’s 
 charge\, the Atomic SET enables ultrasensitive imaging of charge ord
 er and thermodynamic properties across a wide range of quantum phenome
 na\, including symmetry-broken phases\, quantum crystals\, vortex char
 ges\, and fractionalized quasiparticles.
URL:https://www.physics.wisc.edu/events/?id=9724
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