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SUMMARY:Excitons in Flatland: Exploring and Manipulating Many-body Effects
  on the Optical Excitations in Quasi-2D Materials - Diana Y. Qiu\; Univers
 ity of California at Berkeley
DTSTART:20190503T140000Z
DTEND:20190503T143000Z
UID:TALK123850@talks.cam.ac.uk
CONTACT:Elizabeth Tennyson
DESCRIPTION:Since the isolation of graphene in 2004\, atomically-thin quas
 i-two-dimensional (quasi-2D) materials have proven to be an exciting platf
 orm for both applications in novel devices and exploring fundamental pheno
 mena arising in low dimensions. This interesting low-dimensional behavior 
 is a consequence of the combined effects of quantum confinement and strong
 er electron-electron correlations due to reduced screening. In this talk\,
  I will discuss how the optical excitations (excitons) in quasi-2D materia
 ls\, such as monolayer transition metal dichalcogenides and few-layer blac
 k phosphorus\, differ from typical bulk materials. In particular\, quasi-2
 D materials are host to a wide-variety of strongly-bound excitons with unu
 sual excitation spectra and massless dispersion. The presence of these exc
 itons can greatly enhance both linear and nonlinear response compared to b
 ulk materials\, making them ideal candidates for optoelectronics and energ
 y applications. Moreover\, due to enhanced correlations and environmental 
 sensitivity\, the electronic and optical properties of these materials can
  be easily tuned. I will discuss how substrate engineering\, stacking of d
 ifferent layers\, and the introduction or removal of defects can be used t
 o tune the band gaps and optical selection rules in quasi-2D materials.
LOCATION:Rayleigh Seminar Room\, Maxwell Centre\, Cavendish Laboratory
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