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SUMMARY:Electrically tunable stacking domains and ferroelectricity in Moir
 é superlattices - Danny Bennett
DTSTART:20210512T103000Z
DTEND:20210512T113000Z
UID:TALK160024@talks.cam.ac.uk
CONTACT:77905
DESCRIPTION:Twistronics is a new and exciting field in physics in which th
 e components of layered systems are twisted or strained by small amounts w
 ith respect to one another\, radically changing the properties of the syst
 em. In 2018 it was discovered that by twisting the layers in bilayer graph
 ene by the 'magic angle' of 1.05 degrees\, the system could exhibit superc
 onducting or insulating behavior\, neither of which are possible when untw
 isted. Very recently it was discovered twisted systems comprised of nonpol
 ar layers could exhibit ferroelectricity [Nature 588\, 71–76 (2020)]. Ho
 wever\, the mechanism remains unclear. \n\nTwisted systems form complex do
 main structures due to the interplay between the in-plane strains and the 
 out-of-plane stacking energy. These domain structures are highly sensitive
  to the twist angle and lattice mismatch. I will discuss theoretical work 
 and first-principles calculations which show that the domain structure can
  also be tuned using an applied electric field\, and in a single sample. I
  will discuss how the domain structures may be responsible for ferroelectr
 icity due to the polar response to their strain gradients via flexoelectri
 city.
LOCATION:Zoom
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