korean english


Home > 게시판 > 세미나

아래와 같이 세미나를 개최하오니 많이 참석해 주시기 바랍니다. 아 래 제목: An Ideal Mean-Field Transition in a Driven Interacting System 연사: 허 명 선 박사 (서울대학교) 일시: 2009년 10월 15일(목) 16:00 장소: 기초과학연구소 세미나실(31317호) 초록: Mean-field approach has been instrumental for developing an insight into critical phenomena. However, close to the phase transition point the mean field approximation usually breaks down. Here we report an observation of an ideal mean-field symmetry breaking transition and the associated critical behavior. The transition occurs in an atomic cloud confined in a periodically modulated magneto-optical trap once the number of atoms reaches a critical value. In the symmetric phase, the atoms equally occupy two parametrically excited vibrational states with opposite phase. As a result of the transition, the state occupations become different. This is symmetry breaking in time rather than in space. It is due to the interatomic interaction and is mediated by nonequilibrium fluctuations. The results demonstrate that a mean-field transition can occur in a many-body system and that the notion of discrete symmetry breaking transitions can be extended to the time domain.
번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1007702
102 <Mar.27(Wed.)> Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope 2019.03.20 77908
101 <April.3(Wed.)> 전자구조계산을 이용한 새로운 양자물질 연구 2019.03.27 43618
100 <April.10(Wed.)> 자성 반데르발스 물질 발견과 전망(Discovery and Perspective of magnetic van der Waals materials) 2019.04.04 44632
99 <April.17(Wed.)> Emerging Artificial Synapse for Learning- and Energy-Efficient Neuromorphic System 2019.04.11 88373
98 <May.1(Wed.)> Introduction of AMS Application 2019.04.24 53469
97 <May.8(Wed.)> Genesis of Matter 2019.05.01 40321
96 <5/16(Thu.) 14:00 ~ >The Chiral anomaly without Landau levels 2019.05.08 83430
95 <May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems 2019.05.08 58518
94 <May.22(Wed.)> Introduction to exotic quantum states in solids 2019.05.15 62429
93 <June.5(Wed.)> Fluid gravity duality 2019.05.29 54550
92 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 104527
91 2019학년도 2학기 콜로퀴움 일정 2019.07.17 419714
90 <8/19(Mon) 14:00 ~ >Exploring topological matter in an atomic quantum simulator file 2019.07.26 66609
89 <8/14(Wed.)>3D-strain induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach 2019.08.13 58594
88 <8/19(Mon) 13:30 ~ >Detection of cosmic rays in the PeV to EeV energy range file 2019.08.16 70192
87 <8/26(Mon) 14:00 ~ >Constructing viable models of bouncing scenarios 2019.08.20 51511
86 <8/30(Fri) 16:00 ~ >Structures of light neutron-rich nuclei, 17,19C 2019.08.22 63141
85 <9/2(Mon) 15:00 ~ >Status of the KM3NeT Deep Sea Neutrino Telescope 2019.08.26 63240
84 <Sept.11(Wed.)> Fantastic physics and materials, how to find them? 2019.09.06 64915
83 <9/17(Tue) 4:00 pm ~ >Dynamics of multiple-Q spin textures and its effect on electronic state 2019.09.10 57283