logo

korean english

게시판

Home > 게시판 > 세미나

에피 산화물연구실에서 전남대학교 물리학과 고아라 교수님과 Oak Ridge National Laboratory의 옥종목 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

온라인으로 진행되는 Webniar(Web+Seminar)이며, Webex meetings 프로그램을 통해 진행됩니다.

===========================================================================

Date/time: 2021. 2. 18 (Thu.) 오전 11 & 오후 2




Speaker: 고아라 교수님 (전남대학교 물리학과)


time: 11:00 am


Title: Hund's metallicity in the vicinity of a Van Hove singularity


Abstract: Hund's metallicity or spin-freezing refers to strong paramagnetic fluctuations and bad metallic behavior driven by Hund's coupling in multi-orbital systems. The effect is prominent at even filling of the three-band system, relevant to ruthenate t2g systems. The low-temperature response of the Hund's metal is an intriguing topic, considering its potential relevance to superconductivity. We perform systematic dynamical mean-field calculations for a three-band model combined with electronic structures accompanying van Hove singularity, including a tight-binding Hamiltonian obtained by the density functional theory for Sr2RuO4. We find that the van Hove singularity significantly enhances Hund's metallicity at relatively low temperatures. We discuss its origin by comparing the results to the Bethe lattice counterpart.


 


Speaker: 옥종목 박사님 (Materials Science and Technology Division, Oak Ridge National Laboratory)


time: 14:00 pm


Title: Correlated topological phases in strongly correlated heterostructures


Abstract: Strong correlation, represented by unconventional superconductors, and Topology, which has started from the quantum Hall effects and developed into topological insulators, have been recognized as two most important areas in condensed matter physics for the past 50 years. Recently, two areas have begun to merge, creating new concepts such as correlated topological materials. Understanding these materials is a fundamental task to realize the future technologies including quantum computing. The most important question is how correlated electrons are affected by topology and what phenomena can emerge from their interactions. From this point of view, I aspire to find correlated materials which have topological characteristics. In this talk, I will introduce potential correlated topological phases and related phenomena found in strongly correlated heterostructures.



번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 2277
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 813591
648 <June 30(Wed.)>Mapping of magnetic anisotropy for van der Waals materials 2021.06.25 5345
647 <June 23(Wed.)>Valley Polarization and Exciton Hall Effect in Transition Metal Dichalcogenides 2021.06.22 6973
646 <June 10(Thu.)>Oxide electronics utilizing spin-orbit coupling 2021.05.31 8580
645 <June 01(Tue.)>Frustration-induced Athermal Behaviors: Hilbert Space Fragmentation and Quantum Many-Body Scars 2021.05.24 8914
644 <May 12(Wed.)> Nanomechanical oscillators for quantum technology 2021.05.06 7621
643 <May 04(Tue.)>Flat bands and the geometry of Bloch wave function 2021.04.27 24620
642 <April 28(Wed.)> 손에 잡히는 AI 2021.04.21 6960
641 <April 21(Wed.)> 우주배경복사 편광 관측 - 남극점 기지 바이셉/켁 어레이(BICEP/Keck Array) 망원경 2021.04.12 6216
640 <April 7(Wed.)> Mid-scale facilities for condensed matter research: high magnetic field and neutron scattering 2021.03.31 11873
639 <Mar.31(Wed.)> Nonlinear nanophotonics using on-chip microring resonator 2021.03.25 15854
638 <Mar.24(Wed.)> A tale of quantum magnets 2021.03.18 17762
637 <Mar.17(Wed.)> Glue spectrum for superconductivity obtained via optical spectroscopy 2021.03.10 16711
636 <Mar.10(Wed.)> Dark matter searches in neutrino detectors 2021.03.04 20406
635 <Mar.3(Wed.)>Scaling laws in Natural Language Processing 2021.02.25 50032
» <Feb.18(Thu.)> Hund's metallicity in the vicinity of a Van Hove singularity / Correlated topological phases in strongly correlated heterostructures 2021.02.16 22496
633 <Jan.28(Thu.)>X-ray Absorption Spectroscopy Study of Amorphous Oxide Thin Films 2021.01.27 13286
632 2021학년도 1학기 콜로퀴움 일정 2021.01.13 107129
631 <Jan.14(Thu.)>Oxygen sponge effects for epitaxial manganite thin film design 2021.01.11 30213
630 <Dec.9(Wed.)>한국형 암흑물질 실험 2020.12.02 11389
629 <Dec.2(Wed.)>The era of gravitational waves, and the science that makes it possible 2020.11.25 22883