<div dir="ltr"><div class="gmail_quote"><br><p><img alt="SDSU_CSRC Logo.jpg" width="534px" height="107px" src="cid:5485b9e9-f5f4-4682-9a31-6e6c9349de47"><br></p><p><br></p><p><font size="4">DATE: <br><b>Friday, September 2, 2022</b></font></p><p><br></p><div dir="ltr"><p></p><p></p><p><font size="4">TITLE:<br><b>Photophysics in Quantum Flatland </b></font> <b> </b></p><p><b> </b></p><p><font size="4">TIME: <br><b>3:30-4:30PM</b></font></p><p> <br></p><p><font size="4">LOCATION:<br><b>In Person - GMCS 314</b><br><br></font></p><p><br></p><p><font size="4">SPEAKER/BIO: <br><b>Sanjay Behura, Physics, San Diego State University</b></font> <b> </b> <b> </b> <b> </b> <b> </b> <b> </b> <b> </b></p><p><br></p><p><font size="4">ABSTRACT:<br>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.</font></p><p><br></p></div><div dir="ltr"><p><font size="4">Host:<br><b> Calvin Johnson</b></font></p></div><div><font size="4"><br></font></div><div><p><font size="4"><span style="font-weight:bold">Note:</span><span style="font-weight:bold"> </span>Videos of previous colloquium talks can be seen on the CSRC website in the colloquium archive section or on the <a href="https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed" target="_blank">CSRC YouTube page here</a>.</font></p><p><br><br><br></p></div><br>
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