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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-9647
DTSTART:20260504T183000Z
DTEND:20260504T203000Z
DTSTAMP:20260520T150139Z
LAST-MODIFIED:20260427T131851Z
LOCATION:B343 Sterling
SUMMARY:Creating new low-switching orderings by stacking order enginee
 ring of 2D materials\, Preliminary Exam\, Carter Fox\, Physics PhD Gra
 duate Student
DESCRIPTION:By altering the stacking order of 2D van der Waals (vdW) m
 aterials\, many new ferroic\, strongly correlated and topological orde
 rings emerge with exotic electrical\, optical and magnetic properties.
  Owing to the weak vdW interlayer bonding\, such highly flexible and e
 nergy-efficient stacking order engineering has transformed the design 
 of quantum properties in 2D materials. In this talk\, I present two ad
 vances enabled by stacking order engineering. First\, I demonstrate th
 e creation of a sliding multiferroic by stacking inherently non-polar 
 layers of the 2D magnet CrI3 into a polar stacking order. Using combin
 ed optical and electrical transport characterization techniques\, emer
 gent sliding ferroelectricity is shown to interplay with interfacial f
 erromagnetism via interlayer spin-polarized charge transfer. This uniq
 ue magnetoelectric coupling mechanism leads to non-volatile magnetic s
 witching at zero external magnetic field\, driven by voltages as low a
 s 0.4 V across the CrI3. Second\, I introduce a new domain superpositi
 on mechanism to engineer topological polar textures based on the ortho
 gonal stacking of displacive vdW ferroelectrics. This concept is demon
 strated with NbOI2 layers\, where we directly observe polar vortices a
 nd related textures at overlapping domain walls via 4D-STEM. Furthermo
 re\, second harmonic generation circular dichroism reveals a robust ch
 iroptical response\, and we show that the macroscopic chiral state is 
 reversibly controlled in four terminal devices. Together\, these resul
 ts highlight stacking order engineering as a versatile route to progra
 mmable multiferroic and topological states in vdW materials\, opening 
 pathways toward next generation electronic\, spintronic\, and photonic
  technologies.
URL:https://www.physics.wisc.edu/events/?id=9647
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