|장소||#1323(E6-2. 1st fl.)|
|일시||Jul. 08 (Fri.) 11:00 AM|
|연사||Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.)|
Jul. 08 (Fri.) 11:00 AM, #1323(E6-2. 1st fl.)
Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.)
Abstract: Recently, a peculiar state of mechanical (phonon) systems, known as isostatic lattices, was both proposed and fabricated as a metamaterial. This state is on the brink of mechanical collapse and remarkably has special topological properties that guarantee the existence of soliton-like zero modes or edge modes with open boundary conditions. It is unlikely these topological phonons will be found in any solid state system since they are not on the brink of mechanical collapse. In this talk, I will discuss my group's research into extending this physics to magnetic systems where ``mechanical collapse'' is replaced with the loss of magnetic order due to frustration. I will prove mathematically that indeed an isostatic magnetic exists, a proof that remarkably employs a supersymmetry between magnons and an invented fermionic degree of freedom I have dubbed magninos. I will conclude with a discussion of the possibilities of finding an isostatic magnet among the kagome and distorted kagome families of antiferromagnets and the potential new phenomena that may be observed in such a material.
 C. L. Kane and T. C. Lubensky, "Topological boundary modes in isostatic lattices", Nature Physics 10, 39 (2013).
 B. G. Chen, N. Upadhyaya, V. Vitelli, "Non-linear conduction via solitons in a topological mechanical insulator", PNAS 111, 13004 (2014).
 M. J. Lawler "Supersymmetry protected phases of isostatic lattices and kagome antiferromagnets", Unpublished, see arXiv:1510.03697.
Contact: Eun Gook Moon, Physics Dept., (email@example.com)
|공지||2019/09/18 - 12/5||Seminar Room #1323||Prof. David Schuster and etc.||Fall 2019: Physics Seminar Serises|
|공지||2019/09/02 - 12/09||Seminar Room 1501||이호성 박사 (한국표준과학연구원) and etc.||Fall 2019: Physics Colloquium|
|49||May 2 (Thu.), 4:00 PM||#1323, E6-2||Prof. Joon Ik Jang||Anomalous optical properties of halide perovskites|
|48||June 28 (Fri.), 13:30 PM||#1323, E6-2||Dr. Yusuke Kozuka||Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures|
|47||July 9 (Mon.), 14:00 PM||#1323, E6-2||Prof. Cesar A. Hidalgo, MediaLab, MIT||The principles of collective learning|
|46||January 17 (Fri), 4:00 PM||#1323, E6-2||Hiroki Ikegami||Symmetry Breaking and Topology in Superfluid 3He|
|45||Apr. 19(Tue.), 2PM||#1323(E6-2. 1st fl.)||Prof. Mark Koepke, Department of Physics and Astronomy, West Virginia University, USA||Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability|
|44||Jul. 28 (Thu.) 4PM||#1323(E6-2. 1st fl.)||Prof. Johannes Pollanen, Jerry Cowen Chair of Experimental Physics at Michigan State University||Low Dimensional Electrons: On the Road to Hybrid Quantum Systems|
|43||Jul. 08 (Fri.) 2PM||#1323(E6-2. 1st fl.)||Dr. Junhyun Lee, Harvard University||Electronic quasiparticles in the quantum dimer model|
|»||Jul. 08 (Fri.) 11:00 AM||#1323(E6-2. 1st fl.)||Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.)||Isostatic magnetism|
|41||Dec. 8(Thu) 4p.m.||#1323(E6-2. 1st fl.)||Dr. Jinhyoung Lee, Hanyang University||Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator|
|40||Nov. 29(Tue) 4p.m.||#1323(E6-2. 1st fl.)||Dr. SungBin Lee, KAIST||Symmetry Protected Kondo Metals and Their Phase Transitions|
|39||Mar. 2nd (Thu), 4:00 p.m||#1323(E6-2. 1st fl.)||Dr. Jonathan Denlinger, Lawrence Berkeley National Lab||“Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”|
|38||Nov. 16 (Wed), 4p.m.||#1323(E6-2. 1st fl.)||Dr. Heung-Sik Kim , University of Toronto||Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators|
|37||Dec. 9(Fri), 1:30 p.m.||#1323(E6-2. 1st fl.)||Dr. Jae Yoon Cho, POSTECH||Entanglement area law in strongly-correlated systems|
|36||Nov. 24(Thu) 4p.m.||#1323(E6-2. 1st fl.)||Dr. Jai-Min Choi, Chonbuk National Univiersity||Harmonic oscillator physics with single atoms in a state-selective optical potential|
|35||Nov. 11th(Fri), 1:30 p.m.||#1323(E6-2. 1st fl.)||Dr. Keun Su Kim, POSTECH||Bandgap Engineering of Black Phosphorus|
|34||Nov. 11th (Fri), 4 p.m.||#1323(E6-2. 1st fl.)||Dr. Bohm-Jung Yang, SNU||Dirac fermions in condensed matters|
|33||Feb. 1 (Wed.), 2p.m.||#1323(E6-2. 1st fl.)||Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo||Quantum electron optics using flying electrons|
|32||Jul. 07 (Thu.) 2PM||#1323(E6-2. 1st fl.)||Dr. Eun Ah Kim, CORNELL UNIV.||Let there be topological superconductors|
|31||Dec. 9(Fri), 4p.m.||#1323(E6-2. 1st fl.||Dr. Kun Woo Kim, KIAS||Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator|