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SUMMARY:van Hove singularity engineering via homo- and hetero-strain in tw
 isted bilayer graphene
DTSTART:20260428T203000Z
DTEND:20260428T223000Z
DTSTAMP:20260615T185300Z
UID:indico-event-297@eventreg.ads.ttu.edu
DESCRIPTION:Speakers: Vikram Deshpande (University of Utah)\n\nResearchers
  are increasingly exploring moiré materials because of their fascinating 
 properties. However\, their remarkable flexibility raises questions about 
 how these materials react to mechanical strain\, particularly since inhere
 nt strain during fabrication may lead to variations between samples. To ad
 dress this\, we’ve developed a method to fabricate samples on flexible s
 ubstrates and apply isotropic strain by displacing them out of plane. By c
 arefully calibrating the strain\, we can manipulate the Hofstadter butterf
 ly in twisted bilayer graphene (TBG) samples away from the magic angle. It
  was shown by Wang et al (PNAS 120 (34) e2307151120 (2023)) that uniaxial 
 heterostrain arising during sample fabrication split the otherwise-degener
 ate van Hove singularity (vHs) of TBG into three. In our samples we study 
 the behavior of the three vHs’s in TBG with applied isotropic strain. We
  find non-intuitive shifts in energy of the three vHs’s with strain indi
 cating that the primary effect of our applied strain in these samples is t
 o rotate the axis of the heterostrain. Our work provides a new route to tu
 ning moire materials in-situ and is helpful toward understanding variabili
 ty in these samples. \n\nhttps://eventreg.ads.ttu.edu/event/297/
LOCATION:120 (ESB1)
URL:https://eventreg.ads.ttu.edu/event/297/
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