korean english


Home > 게시판 > 세미나

Brookhaven National Laboratory의 Christopher Homes교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다. 


아 래


제목: Optical properties of iron-based conductors and superconductors


연사: Prof. Christopher Homes (Condensed Matter Physics and Materials Science Dept., Brookhaven National Laboratory) 


일시: 2014. 4. 21(월) 오후 2:00 ~ 4:00


장소: 삼성학술정보관 7층 Creative learning room


초록: In the high-temperature cuprate superconductors, only a single band is observed at the Fermi level; as a result the optical conductivity may be modeled using a single free-carrier component.  In a simple metal the Drude model usually sufficient; however, electronic correlations and electron-boson coupling in the cuprates require a more generalized form in which the scattering rate and the effective mass are both frequency dependent [1].  The iron-based conductors and superconductors are multiband materials with several bands crossing the Fermi level, resulting in multiple hole and electron pockets at the center and corners of the Brillouin zone, respectively [2].  The presence of multiple bands requires, at a minimum, a “two-Drude” model in which the electron and hole pockets are treated as separate contributions [3]. In general, the two-Drude approach reveals: (i) a strong component associated with the hole pocket with a large scattering rate (nearly incoherent transport) that is essentially temperature independent; (ii) a weaker component associated with the electron pocket whose scattering rate has a strong temperature dependence.  Some recent results using this approach in the pnictide materials BaFe2As2 (TN~138 K) and Ba0.6K0.4Fe2As2 (Tc~38 K) [4] will be discussed, as well as some preliminary findings the iron-chalcogenide systems, Fe1+Te (TN~68 K) and FeTe0.55Se0.45 (Tc~14 K) [5].

*This work done in collaboration with Yaomin Dai, Qiang Li, Jinsheng Wen, Zhijun Xu, Genda Gu, Ricardo Lobo, and Ana Akrap; work supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02-98CH10886.

[1] A. V. Puchkov, D. N. Basov, and T. Timusk, J. Phys.: Condens. Matter 8, 10049 (1996).
[2] S. Raghu et al., Phys. Rev. B 77, 220503(R) (2008).
[3] D. Wu et al., Phys. Rev. B 81, 100512 (2010).
[4] Y. M. Dai et al., Phys. Rev. Lett. 111, 117001 (2013).
[5] C. C. Homes et al., Phys. Rev. B 81, 180508(R) (2010).

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1079442
196 <4/20> Chern-Simons gauge theories and M2 brane CFTs 2009.04.09 77231
195 <5/8> A brief introduction to holographic entanglement entropy 2012.05.07 77314
194 <11/10>Mutifunctional Magnetic Oxides (다 기능성 자성 산화물) 2006.11.08 77328
193 <11/5> Optical spectroscopic probe on the surface state in three dimensional topological insulators 2012.10.24 77396
192 <8/21(수)> 고온 초전도 특별세미나 2013.08.21 77499
191 <8/19(Mon) 14:00 ~ >Exploring topological matter in an atomic quantum simulator file 2019.07.26 77579
190 <2/10(화) 오후 2시> 특별 초청세미나 개최 안내 file 2015.02.06 77715
189 <10/13(Thu.) 13:00>기술융합을 통한 의료혁명과 물리학의 역할 2016.09.29 77855
188 <4/23> BK 석학초청 특별강연 - Connections between Stellar Evolution and Nuclear Physics 2012.04.16 77895
187 <11/14>Oxide heterostructure and multifunctional devices 2006.11.10 78008
186 <3/31(화)> 초청세미나 개최 안내 2015.03.24 78095
185 <8/1(Wed.) 4:00pm>Band Topology in Nodal Line Semimetals with Z2 Monopole Charges 2018.07.23 79044
184 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 79128
183 <9/2(Mon) 15:00 ~ >Status of the KM3NeT Deep Sea Neutrino Telescope 2019.08.26 79149
182 <12/21(금)> Generic quantum spin ice 2012.12.03 79290
181 <11/27> N=4,5,6,8 superconformal Chern-Simons theory 2008.11.25 79644
180 <Aug. 4(Wed.)>Electronic Properties of Mixed-dimensional 2D/3D Heterostructures 2021.08.04 80068
179 <5/9> Gravity dual of (Non-)Fermi Liquids from Entanglement Entropy 2012.05.07 80273
178 <3/27> The Born series for S-wave spin-quartet neutron-deuteron scattering at small cutoff values. 2013.03.25 80463
177 <10/18(Thu.) 1:30pm>Machine Learning Approaches for Solving Physics Problems: Usability of Experimental Data 2018.10.15 80491