logo

korean english

게시판

Home > 게시판 > 세미나

고체전자구조계산 연구실에서 강원대학교 물리학과의 김흥식 교수님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참여를 부탁 드립니다.

오프라인으로 진행되는 세미나입니다.

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

○ Topic: Anomalous Hall signatures of nonsymmorphic nodal lines in the doped chromium chalcospinel CuCr2Se4

 

○ Speaker: 김  흥  식 교수님 (강원대학교 물리학과)

 

○ Date/time: 2022. 5. 3. (Tue.) 4:00 PM

 

○ Place: Natural Science 1,  Room No. 31317

 

○ Abstract: An emerging phase of matter among the class of topological materials is nodal line semimetals, possessing symmetry-protected one-dimensional gapless lines at (or close to) the Fermi level in k space. When the k dispersion of the nodal line is weak, van Hove singularities generated by the almost flat nodal lines may be prone to instabilities introduced by additional perturbations such as spin-orbit coupling or magnetism. Here, we study the Cr-based ferromagnetic chalcospinel compound CuCr2Se4 (CCS) via first-principles electronic structure methods and reveal the true origin of its dissipationless anomalous Hall conductivity, which was not well understood previously. We find that CCS hosts nodal lines protected by nonsymmorphic symmetries, located in the vicinity of Fermi level, and that such nodal lines are the origin of the previously observed distinct behavior of the anomalous Hall signature in the presence of electron doping. The splitting of the nodal line via spin-orbit coupling produces a large Berry curvature, which leads to a significant response in anomalous Hall conductivity. Upon electron doping via chemical substitution or gating, or rotation of magnetization via external magnetic field, noticeable change of anomalous Hall behavior occurs, which makes CCS a promising compound for low-energy spintronics applications.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1058976
682 2022학년도 2학기 콜로퀴움 일정 2022.06.22 792
681 <July 8(Fri.)>Intertwined magnetism and charge density wave in a kagome metal 2022.06.03 910
680 <May 18(Wed.)>Magnetoresistance and Hall effects of Fe5Sn3 single crystals 2022.05.12 1138
679 <May. 10(Tue.)>Longitudinal magnon decay in the quasi-two-dimensional antiferromagnet in Ba2FeSi2O7 2022.05.09 1307
678 <May 11(Wed.)>Key Nuclear Experimental Studies to Find the Origin of Elements 2022.05.04 1223
677 <May 4(Wed.)>Recent progress in the study of topological phases of matter 2022.04.27 1229
676 <Apr. 27(Wed.)> I) A few first questions by me. II) ‘Topotactic resistance switching RAM’의 최초 발견 2022.04.20 1153
» <May. 3(Tue.)>Anomalous Hall signatures of nonsymmorphic nodal lines in the doped chromium chalcospinel CuCr2Se4 2022.04.19 1407
674 <Apr. 20(Wed.)> 반도체 공정용 플라즈마 물리 2022.04.14 1266
673 <Apr. 6(Wed.)> Holographic Flat Panel Displays 2022.03.30 1780
672 <Mar. 30(Wed.)> Two-dimensional Semiconductors and their applications 2022.03.23 1613
671 <Mar. 23(Wed.)> Next-generation artificial intelligence devices and physics 2022.03.16 2801
670 <Mar. 16(Wed.)> 현세대/차세대 이차전지 기술 동향 및 전망 2022.03.02 1657
669 <Mar. 2(Wed.)>Introduction to high-energy nuclear physics 2022.02.24 2122
668 <Jan. 27(Thu.)>Emulating twisted double bilayer graphene with a multiorbital optical lattice 2022.01.18 2317
667 2022학년도 1학기 콜로퀴움 일정 2022.01.10 41770
666 <Dec. 1(Wed.)>Halide Perovskite Single Crystals and Thin Films for Solar Cells and Optoelectronics 2021.11.25 190353
665 <Nov. 29(Mon.)>Exploring light-matter interactions at atomic scale using electron microscopy 2021.11.22 6651
664 <Nov. 17(Wed.)>펜로즈의 삼각형과 블랙홀 - 부분과 전체 2021.11.11 4057
663 <Nov. 10(Wed.)>Optical Spectroscopy of 2-Dimensional Materials 2021.11.03 7375