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 L35: DMP 2021 Prize SessionInvited Live Prize/Award Undergrad Friendly
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Sponsoring Units: DMP Chair: Rachel Goldman, University of Michigan |
Wednesday, March 17, 2021 8:00AM - 8:36AM Live |
L35.00001: David Adler Lectureship Award in the Field of Materials Physics Invited Speaker: Robert Cava Although communication has never been one of my personal strengths, I am indeed hard to turn off when it comes to talking about science, so this award is suitable for me. My plan is to talk about some recent discoveries in quantum materials that have been made in my research group, which have happened due to a combination of my drive and curiosity, the fact that I like theorists, my love of both chemistry and physics, the skills and insights of my research group members, and the generosity of my mentors and collaborators. I think that we will probably all agree that materials physics is a contentious field, and like everyone out there I have endured many an insult from anonymous referees whose goal seems to be to prove that they are smarter than I am, but if there are general messages that I’d like to pass on to younger scientists in this talk they are to look beyond the affronts of life to see how you can improve yourself, and to never give up. Illegitimi non Carborundum. |
Wednesday, March 17, 2021 8:36AM - 9:12AM Live |
L35.00002: James C. McGroddy Prize for New Materials (2021): A sixteen-barrel atomic launcher — homing in on new materials and novel physics Invited Speaker: Ivan Bozovic Three decades ago, Jim Eckstein started experimenting with atomic-layer-by-layer molecular-beam epitaxy (ALL-MBE) of cuprates. Darrell Schlom and I joined, and despite widespread skepticism, soon we were growing films showing high-temperature superconductivity (HTS), and a little later, new “artificial” (metastable) HTS materials such as Bi2Sr2Can-1CunO2n+2 with n = 4, 5,…,8,…, as well as atomically-precise heterostructures and superlattices. |
Wednesday, March 17, 2021 9:12AM - 9:48AM Live |
L35.00003: James C. McGroddy Prize for New Materials (2021): Breaking the Rules to Unleash Novel Phenomena in Oxides Invited Speaker: Darrell Schlom When it comes to unleashing hidden ground states in oxides and the novel phenomena they possess, |
Wednesday, March 17, 2021 9:48AM - 10:24AM Live |
L35.00004: James C. McGroddy Prize for New Materials (2021): Proximity induced superconductivity in topological surface states on bulk insulating topological insulators. Invited Speaker: James Eckstein Our group has explored the proximity effect from superconducting niobium into topological insulators using ARPES and Josephson junction-based transport samples. The goal is to make an artificial topological superconductor with a hard gap that may support Majorana Zero Modes (MZM) with long parity lifetimes. Using ARPES we have studied the free side of samples of some topological insulators on niobium substrates. We have found that TIs with bulk carriers (Bi2Se3) exhibit strongly thickness dependent superconductivity penetrating away from the surface into the bulk without a hard gap. On TIs without bulk carriers (BiSbTe3) this is absent. However, the topological carriers on the surface directly in contact with the superconductor still become superconducting. To study this, we have made transport samples by putting square arrays of small niobium islands (50 nm radius) on top of bulk-insulating BiSbTe3 thin films. The island size and spacing is smaller than emergent superconducting length scales and similar in size to the topological carrier mean free path. These samples exhibit a superconducting transition at 300 mK with a phase stiff supercurrent that saturates to a low temperature limit below 150 mK. The current-voltage characteristics of the array are similar to those of an overdamped SNS Josephson junction. The superconductivity occurs only in the topological surface layer. This kind of artificial topological superconductor may exhibit a hard gap and be suitable for exploring MZMs. This work was carried out in collaboration with Yang Bai, Joseph Hlevyack, David Floetotto, and Tai Chiang Chang. |
Wednesday, March 17, 2021 10:24AM - 11:00AM Live |
L35.00005: C10 Young Scientist Award for 2021 Invited Talk: Realizing dynamical quantum phases with trapped ions Invited Speaker: Andrew C Potter Experimental platforms for quantum simulation enable access to new regimes of quantum dynamics far from equilibrium, with microscopic spatial- and temporal- control over interactions. In this talk, I will review progress in understanding how these capabilities can lead to new dynamical symmetry breaking and topological phases without equilibrium analogs, and discuss experimental realizations of two such dynamical phases in trapped ion quantum simulators: i) dynamical symmetry-breaking (“discrete time-crystal”) phases from periodic time-dependent driving and ii) topological edge modes without symmetry-protection enabled by quasiperiodic time-dependent driving. |
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