Geometric characterization of thermoelectric performance of two-dimensional quadratic band-crossing semimetals
2024.03.27 10:14
날짜 | 2024-03-28 11:00 |
---|---|
일시 | Mar 28th (Thu.) 11:00AM |
장소 | E6, #2501 |
연사 | Chang-geun Oh(University of Tokyo) |
아래와 같이 세미나를 개최하고자 하오니, 관심있는 분들의 많은 참석 부탁드립니다.
Date: 11:00 Am, 28th Mar (Thu.)
Place: E6, #2501
Speaker: Chang-geun Oh(PhD candidate, The University of Tokyo)
Title: Geometric characterization of thermoelectric performance of two-dimensional quadratic band-crossing semimetals
Abstract:
The geometric characteristics of Bloch wave functions play a crucial role in electronic transport properties. We show that the thermoelectric performance of materials is enhanced by the geometric structure of electronic wavefunctions within the framework of the Boltzmann equation. The essential geometric notion is the HilbertSchmidt quantum distance, measuring the resemblance between two quantum states. The geometric characterization of the scattering rate is established by extending the concept of quantum distance between two states at distance in the base manifold. Employing isotropic quadratic band touching models for which we can concentrate on the role of quantum metric tensor, we reveal that the response functions for electrical quantum transport and therefore the thermoelectric power factor can be succinctly expressed in terms of the maximum quantum distance, dmax. Specifically, when dmax reaches one, the power factor doubles compared to the case with trivial geometry (dmax = 0). Our finding highlights the significance of the quantum geometry in improving the performance of thermoelectric devices and providing the practical usages of topological material.
댓글 0
번호 | 날짜 | 장소 | 제목 |
---|---|---|---|
450 | 2015-03-04 12:00 | 1323호, E6-2 | Bioimaging and Biosensing Using Near-Infrared Fluorescence |
449 | 2016-12-12 13:30 | 1:30p.m. #1323(E6-2. 1st fl.) | “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors” |
448 | 2016-10-18 13:30 | 1st fl. #1323(E6-2) | "Visualization of oxygen vacancy in motion and the interplay with electronic conduction" |
447 | 2019-07-10 16:00 | Academic Cltural Complex (E9) 5층 스카이라운지 | Public Lectures |
446 | 2015-08-04 11:00 | B501, Room Red, KI bldg. 5nd fl. | Propagation of ultrasound through two- and three-dimensional strongly scattering media |
445 | 2016-06-01 10:30 | BK21 Conference Room (#1318, E6-2) | Welcome to Nature Photonics |
444 | 2020-10-15 16:00 | CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus | Graphene-based Josephson junction microwave bolometer |
443 | 2023-09-14 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP seminar] Dark matter searches in Water Cherenkov Detectors |
442 | 2023-05-15 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | Role of dark Higgs boson in DM physics and cosmology |
441 | 2023-06-14 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP seminar] EMC at CERN |
440 | 2023-09-18 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP Seminar] Searching for axions in quantum vacuum birefringence |
439 | 2023-10-11 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP seminar] Particle Physics with Neutrinos |
438 | 2023-09-21 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP seminar] Axion Magnetic Resonance |
437 | 2024-01-25 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP seminars] Detecting Gravitational Waves by Elecromagnetic Cavity |
436 | 2023-06-22 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP Seminar] The muon g-2 puzzle |
435 | 2023-03-30 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | Detecting axions with chiral magnetic effects |
434 | 2023-03-27 15:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | A coherent mechanical oscillator pumped by a suspended quantum dot |
433 | 2023-06-15 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP Seminar] Cryogenic electronics for ion traps |
432 | 2023-07-26 10:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio |
431 | 2023-07-20 16:00 | CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus | [CAPP Seminar] Cosmoparticle Physics of Dark Universe |