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SUMMARY:Stacking and twisting 2D materials for quantum nano-optoelectronic
 s:  Fundamentals and applications  - Prof. Frank Koppens\, ICFO
DTSTART:20210325T150000Z
DTEND:20210325T160000Z
UID:TALK156043@talks.cam.ac.uk
CONTACT:Malavika Nair
DESCRIPTION:Two-dimensional (2D) materials have emerged as a novel toolbox
  to build new materials and devices atom-by-atom. By stacking and twisting
  2D materials\, new ways to control light and electrons at the atomic scal
 e. In particular\, we will show nano-optoelectronic devices for applicatio
 ns as well as the novel nanophotonic properties[1]. The limits of quantum 
 light-matter interactions have been challenged by approaching optical fiel
 d confinement down to the length-scale of single atoms[2].\n\nWe will also
  present nano-optoelectronic studies on twisted bilayer graphene using sca
 nning near-field optical microscopy[3]\,[4]. Twisted bilayer graphene near
  the magic angle (MABG) exhibit strongly correlated phases have been obser
 ved\, including superconductivity and the Mott-like insulating state[5]. S
 everal device applications\, such as detectors for infrared and THz light 
 will also be discussed[6].\n\nReferences\n\n1. Polaritons in layered two-d
 imensional materials. Low et al.\, Nature Materials (2017).\n\n2. Far-fiel
 d excitation of single graphene plasmon cavities with ultracompressed mode
  volumes. Epstein et al.\, Science (2020).\n\n3. Collective excitations in
  twisted bilayer graphene close to the magic angle. Hesp et al.\, Arxiv 19
 10.07893 (2019).\n\n4. Nano-imaging photoresponse in a moiré unit cell of
  minimally twisted bilayer graphene. Hesp et al.\, Nature Communications (
 2020).\n\n5. Unconventional superconductivity in magic-angle graphene supe
 rlattices. Y. Cao et al. Nature (2018).\n\n6. Plasmonic antenna coupling t
 o hyperbolic phonon-polaritons for sensitive and fast mid-infrared photode
 tection with graphene. Castilla et al.\, Nano Letters (2019) 
LOCATION:https://zoom.us/j/92811261822?pwd=ZFYxdFo0UHdHb0djTnRTS1JwYnlKZz0
 9     Meeting ID: 928 1126 1822  Passcode: 012201 
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