Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D36: DMP Award SymposiumInvited Undergrad Friendly
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Sponsoring Units: DMP Chair: Vivien Zapf, Los Alamos Natl Lab Room: Room 236 |
Monday, March 6, 2023 3:00PM - 3:36PM |
D36.00001: James C. McGroddy Prize for New Materials Winner: James Hone Invited Speaker: James C Hone
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Monday, March 6, 2023 3:36PM - 4:12PM |
D36.00002: Synthesis of boron nitride single crystals under high pressure and impurity/isotope control for their functionalization Invited Speaker: Takashi Taniguchi Hexagonal boron nitride (hBN) and cubic BN (cBN) are known as the representative crystal structures of BN. The former is chemically and thermally stable and has been widely used as an electrical insulator. The latter, which is a high-density phase, is an ultra-hard material second only to diamond. The color of the cBN crystals were always amber or brownish so far which is attributed by carbon and oxygen impurity. After some struggles for high pressure and high temperature (HPHT) solution growth, we could find suitable solvent of Ba-BN system which gave us almost colorless cBN with band-edge nature[1]. At the same time, high purity hBN crystals were recovered in the same HPHT capsule and their attractive potential as a wide-band gap material was realized. It is emphasized that hBN crystals exhibits superior properties as ultra violet light emitter as well as a substrate of graphene devices[2]. While the current subject is to realize how the major impurities such as carbon and oxygen affect the properties of hBN, some progerss for the realization for the application of 2D’s substrates and photonic materials have been achieved. |
Monday, March 6, 2023 4:12PM - 4:48PM |
D36.00003: James C. McGroddy Prize for New Materials Winner: Optical properties of Far-UV luminous hexagonal boron nitride and its applications Invited Speaker: Kenji Watanabe Since the discovery of graphene, two-dimensional (2D) van der Waals atomic-layer materials have been extensively studied for the last decade and a half in terms of the 2D physics of quantum correlation, superconductivity, photonics, topology and so on. From the early stage of research on graphene, hexagonal boron nitride (h-BN) single crystals grown by high-pressure, high-temperature (HPHT) synthesis have been used as the best substrate dielectric for studying 2D physics of graphene. A single crystal of h-BN has a layered structure, in which each layer is composed of atomically flat with sp2 bonding between boron and nitrogen atoms, and the interlayers are coupled weakly via van der Waals interaction. The surface of the cleaved layer is thus almost free of dangling bonds and charge traps, which would scatter charged carriers and cause inhomogeneous fluctuations in chemical potential. The use of h-BN dielectric is also applicable for other 2D materials, and it is indispensable for the study of physics in 2D materials. |
Monday, March 6, 2023 4:48PM - 5:24PM |
D36.00004: James C. McGroddy Prize for New Materials Winner: Twist-Controlled van der Waals Heterostructures Invited Speaker: Emanuel Tutuc The advent of van der Waals heterostructures of two-dimensional (2D) materials has added a new tool to electronic materials design, namely that of controlling the relative angle between different 2D materials in a heterostructure, which in turn has opened new avenues to tailor interaction and topology. This presentation will describe experimental advances in the realization of twist-controlled van der Waals heterostructures of 2D materials, with examples from rotationally aligned double layers and twist-controlled moiré patterns of graphene and transition metal dichalcogenides. |
Monday, March 6, 2023 5:24PM - 6:00PM |
D36.00005: IUPAP Award Talk: Wigner crystals in a van der Waals heterostructure Invited Speaker: You Zhou A Wigner crystal is the first predicted correlated electron state and can melt via thermal and quantum phase transitions. Although several exotic electronic and magnetic phases have been predicted to exist near the quantum melting of a Wigner crystal, it has been difficult to study them due to the challenges in realizing Wigner crystals in the quantum regime. In this talk, I will discuss how van der Waals heterostructures made of atomically thin semiconductors form a new materials platform to investigate Wigner crystals and their quantum melting. I will focus on how we can use optical spectroscopy to probe correlated insulating states, their electronic order, and quantum phase transitions in van der Waals heterostructures. Finally, I will provide a perspective on the opportunities and challenges emerging from these recent demonstrations for investigating correlated phases and applications in quantum technologies. |
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