Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J35: DMP 2020 Prize SessionInvited Live Prize/Award
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Sponsoring Units: DMP Chair: Antoinette Taylor, Los Alamos Natl Lab |
Tuesday, March 16, 2021 3:00PM - 3:36PM Live |
J35.00001: James C. McGroddy Prize for New Materials (2020): Progress in high-temperature conventional superconductivity Invited Speaker: Mikhail Eremets Room-temperature superconductivity became realistic as a result of dramatic progress in conventional superconductivity: starting from the critical temperature Tc =203 K in hydrogen sulfide under high pressures of about 150 GPa1, 243 K at 200 GPa in YH92, 250-260 K in LaH103,4, and 287 K in carbonaceous hydrogen sulfide5. Two main structures of the superconducting hydrides were discovered. In the first family, a cage-like structure is realized. In particular, in lanthanum hydride LaH10, La atom is located at the center of the cage of hydrogen atoms. The lanthanum atom acts as an electron donor contributing to electron pairing, while the hydrogen atoms form weak covalent bonds with each other within the cage. This and other superhydrides (YH9, CaH6) can be considered as a close realization of superconductng metallic hydrogen6. The second structure realized in H3S1 is different: here each hydrogen atom is connected by a strong covalent bond to the two nearby sulfur atoms. The strong bonding provides large electron-phonon coupling and enhanced superconductivity. The covalent metals are perspective ambient pressure superconductors. We will discuss different ways for further increase of Tc at high and ambient pressures. |
Tuesday, March 16, 2021 3:36PM - 4:12PM Live |
J35.00002: Edward A. Bouchet Award: Following Bouchet: Service, Mentoring, and Surface State Transport in 3D Topological Insulators Invited Speaker: Nadya Mason In this Bouchet Award talk, I will first discuss the importance of service and mentoring, using my experiences and the life of Edward Bouchet as examples. I will then discuss some of my research on topological insulators (TIs), whose conducting surface states have attracted significant interest as new electronic phases having potential applications from dissipationless interconnects to quantum computing. In particular, I will describe some measurements which demonstrate the unique properties of surface transport in the 3D TI Bi2Se: TI-superconductor junctions where the supercurrent flows primarily through surface states, Aharonov-Bohm effects which demonstrate ballistic surface transport, Fraunhofer spectroscopy where an in-plane magnetic field leads to finite momentum shifts in Cooper pairs, and anisotropic magnetoresistance in TI magnetic structures showing tunable gapping of the surface state. |
Tuesday, March 16, 2021 4:12PM - 4:48PM Live |
J35.00003: APS Medal for Exceptional Achievement in Research (2020): The Metal-Insulator Transition in Strongly Interacting Electron Systems in Two Dimensions* Invited Speaker: Myriam Sarachik It is a great pleasure to be given this opportunity to celebrate and thank the American Physical Society for selecting me to receive last year’s 2020 APS Medal for Exceptional Achievement in Research for “fundamental contributions to the physics of electronic transport in solids and molecular magnetism”. While my interest in molecular magnets began some twenty five years ago, various issues concerning electronic transport have spanned my entire research career. Starting with early work in the 1960’s on the resistance minimum and what is now known as the Kondo effect, my investigations of different aspects concerning electrical transport have continued through the years via studies of the metal-insulator transition (MIT) in doped semiconductors, measurements of the critical conductivity exponents at the MIT associated with various universality classes, hopping conduction and the Coulomb gap, the roles of disorder and interactions, and more. My most recent focus has been on the MIT in strongly interacting electron systems in two dimensions, where metallic behavior was not expected to occur. Here I will briefly summarize the current situation concerning this unresolved problem, and I will report exciting new experimental results that raise questions and open new doors for further research. |
Tuesday, March 16, 2021 4:48PM - 5:24PM Live |
J35.00004: IUPAP Award Talk Invited Speaker: Andrea Young Most ferromagnets are based on the polarizatoin of electron spins. However, ferromagnetism based on purely orbital degrees of freedom is also possible, though experimental examples are rare. In this talk I will describe recent experiments that explore the proliferation of orbital magnets in graphene based systems. Most simply, I will show that in rhombohedral trilayer graphene at low density, the electron gas takes advantage of the intrinsic valley degree of freedom to form an itinerant orbital magnet. In systems with a moire potential, including rhombohedral trilayer aligned to hBN as well as a variety of rotationally faulted graphene systems, the moire superlattice allows for electronic gaps to form at finite electron densities corresponding to integer or fractional filling of the moire band. Among these are spontaneous Chern insulators---gapped ferromagnetic showing quantized Hall conductivity at zero magnetic field. I will discuss new phenomena observed in these unusual magnets in a variety of moire systems, including electrically actuated switching of magnetic states using current- and gate voltage and the observation of Chern insulators that spontaneously break the superlattice symmetry. |
Tuesday, March 16, 2021 5:24PM - 6:00PM Live |
J35.00005: David Adler Lectureship Award in the Field of Materials Physics (2020): Epitaxial Oxides: From Basic Science to Application Invited Speaker: Chang-Beom Eom Oxide materials are the most abundant compound in the earth’s crust and possess a wide range of |
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