visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
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.
 
번호 날짜 장소 제목
219 2022-05-20 11:00  E6-1 #1323  (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals
218 2022-04-08 11:00  E6-1 #1323  (응집물리 세미나) Flat-surface-assisted physical phenomena occurring in single crystal metal thin film file
217 2022-03-25 11:00  E6-1 #1323  (응집물리 세미나) Hund's metallicity in ruthenate systems file
216 2014-12-22 14:00  E6, Rm1319  Dynamics of molecular motors: Power stroke vs Brownian ratchet file
215 2023-09-27 16:00  E6, Rm#2501  Chiral Magnets: Domain-Wall Skyrmions and String Theory Realization
214 2023-08-24 11:00  E6, Rm#1323  Advancing magnonic metamaterials: spin waves in nanomagnetic arrays
213 2023-06-26 11:00  E6, Rm#1323  Quantum computing on magnetic racetracks with flying domain wall qubits
212 2016-03-07 16:00  E6, 1501  Physics Colloquium : 2016 Spring file
211 2015-09-07 16:00  E6, 1501  Physics Colloquium : 2015 Fall file
210 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
209 2015-09-15 16:00  E6, 1501  Physics Colloquium : 2014 Fall file
208 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
207 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
206 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
205 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
204 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
203 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
202 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
201 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
200 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file