[Faculty] Fwd: [CSRC.COLLOQUIUM] "Photophysics in Quantum Flatland"

[Jose Castillo]

[image: SDSU_CSRC Logo.jpg]


DATE:
*Friday, September 2, 2022*


TITLE:
*Photophysics in Quantum Flatland *



TIME:
*3:30-4:30PM*



LOCATION:
*In Person - GMCS 314*


SPEAKER/BIO:
*Sanjay Behura, Physics, San Diego State University*


ABSTRACT:
Quantum information science for US economic and national security as
outlined in the National Quantum Initiative have attracted much research
interests in the advanced quantum materials. The key to emerging quantum
technologies such as quantum computing and quantum communications is how to
produce high quality quantum materials and how to precisely control their
quantum states. Two-dimensional (2D) quantum materials and their van der
Waals heterostructures with specific orientation and energetics provide
precise control of their structure and properties enabling advanced
photonic and quantum technologies. Atomically thin 2D quantum materials
(quantum flatland) offer a unique platform for the creation of engineered
heterostructures with 0D, 1D, 2D and 3D materials with extended range of
functionalities. This talk aims to provide the underlying surface physics
to build the design-principles for the large-area growth of quantum 2D
materials and engineered heterostructures. The first part of the talk is
centered on developing large-area, transfer-free hexagonal boron nitride
(h-BN) crystals on various dielectric substrates and heterostructures of
h-BN with other 2D materials suitable for quantum and photonic circuits. I
will discuss equilibrium twist-angle-based Moiré fringes for the
direct-growth of graphene on h-BN and the anchoring of plasmonic
nanoparticles on sp2 lattice. The second part of the talk is focused on
understanding the electrostatic coupling and interfacial dipole formation
of 2D layers atop bulk or low-dimensional semiconductors leading to
energy-band reorganization and crystal stability, respectively. These
mixed-dimensional surface-bound planar or radial heterojunctions create a
light-sensitive junction only one-atom below the top surface providing
direct access to the photosensitive junction suitable for integrated
optoelectronic and photonic circuits.


Host:
* Calvin Johnson*

Note: Videos of previous colloquium talks can be seen on the CSRC website
in the colloquium archive section or on the CSRC YouTube page here
<https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed>.





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