Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session K01: Lustig Award Session |
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Chair: Stacy Palen, Weber State Univ Room: UNM PAIS 1100 |
Saturday, October 15, 2022 10:45AM - 11:05AM |
K01.00001: A search for the coldest planets observed by the Transiting Exoplanet Survey Satellite Invited Speaker: Mallory Harris The Transiting Exoplanet Survey Satellite (TESS) is optimized to search small, low-mass stars or "M dwarfs" in the solar neighborhood for transiting extrasolar planets. By focusing on these cool stars and observing the whole sky, TESS represents a new opportunity to study the demographics of planets in these systems. Using observations from TESS, I am conducting a survey of cold planets orbiting low-mass stars to calculate their occurrence rates and to provide targets for future characterization. Although previous planet hunting missions have shown that planets with periods <20 days are abundant around M dwarfs, planets with periods >20 days still encompass a region of parameter space that has yet to be thoroughly explored. These planets and their demographics could provide new insight into theories of planet formation and migration around cool stars. To identify planets in the TESS data, I have designed a pipeline and neural network to detect and vet both single- and multiply-transiting long-period planets, and I am working with the exoplanet community to authenticate the planet candidates I find. I will report on the current state of this search, as well as the discovery of a multi-planet system around low-mass stars that contains an 84-day period planet (the coldest M dwarf planet found by TESS to date) that represents the potential embodied by this search. |
Saturday, October 15, 2022 11:05AM - 11:25AM |
K01.00002: Bose Einstein Condensate of Spontaneously formed Triplet Excitons in Yin-Yang Flat Bands Invited Speaker: Gurjyot S Sethi Excitonic Bose-Einstein condensation (BEC) is a fascinating phenomenon manifesting macroscopic coherence of excitons, yet to be conclusively demonstrated either theoretically or experimentally. In this work, we show that flat valence and conduction bands (so called yin-yang flat bands (FBs)) of diatomic Kagome lattice, as exemplified in a superatomic graphene lattice, conspire to provide an ideal platform for realizing a triplet excitonic insulator state. Based on density-functional theory calculations combined with many-body GW and Bethe-Salpeter equation, we show the binding energy of a single triplet exciton can exceed the band gap, indicative of spontaneous exciton formation. Moreover, by developing an efficient exact diagonalization method for solving and analyzing many-exciton wavefunctions, we go beyond the state-of-the-art computational studies which are largely limited to single exciton calculations. This has enabled us to show directly spontaneous BEC of triplet excitons in an extended Hubbard model. We elucidate the critical role of FBs in promoting quantum coherence, evidenced by an off-diagonal long-range order in many-exciton states. This work significantly enriches FB and excitonic physics leading to the material realization of spinor BEC and spin superfluidity. |
Saturday, October 15, 2022 11:25AM - 11:45AM |
K01.00003: Interdisciplinary Applications of Physics and Machine Learning Invited Speaker: Yaroslav Balytskyi My research interests span Physics, Machine Learning (ML), and Quantum Cryptography and focus on three areas: |
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K01.00004: Lustig Award Session Zoom Link https://unm.zoom.us/j/99738049846?pwd=dUdPUEdkVGNubjlaMlN4WHJBMXNlUT09 |
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