visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-07-10 16:00 
일시 July 10th(Mon), 16:00 
장소 E6, #1323 
연사 Jonathan Denlinger (Advanced Light Source, Lawrence Berkeley National Lab) 

물리학과에서는 아래와 같이 세미나를 개최하고자 하오니 관심있는 분들의 많은 참석 부탁드립니다.

 

Date: 16:00 pm, 10th July (Mon)
 
Place: E6, #1323
 
Speaker: Jonathan Denlinger (Advanced Light Source, Lawrence Berkeley National Lab)
 
Title: Electronic structures of magnetic and non-magnetic ordering in d- and f-electrons systems
 
Abstract: 

Two rather disparate topics of ferromagnetism in the d-electron triple-layer strontium ruthenate, Sr4Ru3O10 and of a non-magnetic “hidden” order (HO) in the f-electron URu2Si2, are shown to have a common theme of the importance of van Hove singularities exhibiting strong electron correlation coherence behavior.

      For Sr4Ru3O10, spin- and angle-resolved photoemission (ARPES) reveal the low temperature electronic structure to be dominated by “two” strong intensity narrow bands at 30 meV below the Fermi-level at the Brillouin zone center and the zone boundary, but with opposite spin-polarization [1].  Both peaks exhibit dramatic temperature-dependent amplitude changes upon warming to the Curie temperature, which is proposed to relate to Hund-metal electron correlations.

     For URu2Si2, a shallow saddle-point band at the zone boundary N-point is proposed [2] to govern the underlying physics of a 35-year old puzzle of a non-magnetic 17.5K phase transition. Comparative changes of the N-point electronic structure for the various chemical-doping phase diagrams that do exhibit magnetic ordering provides proof of this model, including ARPES circular dichroism of an incommensurate-nested scattering process that demonstrates the existence of a helical ordering of f-orbitals in the HO phase. 

 

[1] P. Ngabonziza, J. D. Denlinger, A. Fedorov, G. Cao, J. W. Allen, G. Gebreyesus, and R. M. Martin, arXiv:2305.07222.

 

[2] J. D. Denlinger et al., Electronic Structure 4, 013001 (2022).

 
번호 날짜 장소 제목
265 2023-07-19 16:00  E6-2, #1323  [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
264 2023-07-18 11:00  E6-2, #1323  Non-Hermitian Casimir Effect of Magnons
263 2018-07-13 14:00  Room 5318, KAIST Natural Sciences Lecture Hall(E6).  Loop Induced Single Top Partner Production and Decay at the LHC
262 2023-07-12 11:00  E6-2, #1323  Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
261 2023-07-11 11:00  E6-2, #1323  Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
260 2024-07-10 16:00  E6-2 #2502  [High Energy Theory Seminar] The Weak Gravity Conjecture in Perturbative String Theory
» 2023-07-10 16:00  E6, #1323  Electronic structures of magnetic and non-magnetic ordering in d- and f-electrons systems
258 2019-07-10 16:00  Academic Cltural Complex (E9) 5층 스카이라운지  Public Lectures file
257 2016-07-28 16:00  #1323(E6-2. 1st fl.)  Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
256 2022-07-14 15:00  E6 #1501 & Zoom  Pure two-dimensional quantum electron liquid and its phase transition
255 2022-07-14 14:15  E6 #1501 & Zoom  Hund and electronic correlations in ruthenium-based systems
254 2022-07-14 13:30  E6 #1501 & Zoom  Electronic structure and anomalous transport properties of topological materials by first principle calculation
253 2016-07-08 14:00  #1323(E6-2. 1st fl.)  Electronic quasiparticles in the quantum dimer model
252 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
251 2016-07-07 14:00  #1323(E6-2. 1st fl.)  Let there be topological superconductors
250 2019-07-03 15:00  E6-2, 2501  Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics" file
249 2023-07-14 11:00  E6-2 #1501  Interfaces engineering of thin film oxides
248 2019-01-23 16:00  Rm. C303, Creation Hall (3F), Munji Campus  Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors file
247 2020-01-17 16:00  #1323, E6-2  Symmetry Breaking and Topology in Superfluid 3He file
246 2019-01-09 16:00  E6-2. 2nd fl. #2501  Molecular Mott state in the deficient spinel GaV4S8 file