|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 M. J. Lawler "Supersymmetry protected phases of isostatic lattices and kagome antiferromagnets", Unpublished, see arXiv:1510.03697.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., (firstname.lastname@example.org)
|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|
|134||2015/11/19, 4PM||E6-2, #1323||Dr. Daesu Lee (University of Wisconsin-Madison)||Emergent Collective Phenomena and Functions at Reduced Dimensions|
|133||2015/12/09, 2PM||E6-2, #1323||Arjun G. Yodh (University of Pennsylvania)||SWELLABLE COLLOIDAL PARTICLES ARE SWELL|
|132||2015/12/02, 4PM||E6-2, #1323||Dr. Dae-Jeong Kim (Dept. of Physics and Astronomy, University of California, Irvine)||Samarium Hexaboride: Is it a Topological insulator?|
|131||2015/12/03, 4PM||E6-2, #1323||Dr. Sang-Yun Lee (3rd institute of Physics, University of Stuttgart, Germany)||Hybrid solid state spin qubits in wide bandgap semiconductors|
|130||2015/11/24, 4PM||E6-2, #1323||Dr. Kab-Jin Kim (Institute for Chemical Research, Kyoto University, Japan)||Topology-based understanding of spin dynamics in inhomogeneously magnetized systems|
|129||2015/11/23, 1:30PM||E6-2, #1323||Dr. Michael Park (Stanford University)||What's Beyond the Standard Model? Lessons from Run I and what might come in Run II|
|128||2015/11/28, 10AM||E6-2, #1323||Dr. Suyong Jung (Korea Research Institute of Standards and Science)||Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier|
|127||2015/12/01, 4PM||E6-2, #1323||Dr. Yeong Kwan Kim(Lawrence Berkeley National Laboratory, USA)||Introducing extra dimensions to spectroscopic studies of advanced quantum materials|
|126||2015/12/11, 1:30PM||E6-2, #1323||Dr. KwangYong Choi (Chung-Ang University)||Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9|
|125||2015/12/11, 3:45PM||E6-2, #1323||Dr. Ji Hun Sim (POSTECH)||Dynamical mean field theory studies on heavy fermion system|
|124||2016/1/11, 4PM||E6-2, #1323||Dr. B.J.Kim (Max Planck Institute for Solid State Research)||Mott Physics in the Strong Spin-Orbit Coupling Regime|
|123||2016/1/26, 2PM||E6-2, #1323||Dr. Sergei V. Kalinin (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory)||Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data|
|122||2016/09/29-12/13||E6-2, #1323||Sangyoon Han 외||2016 Fall, Physics Seminar Serises|
|121||Jun 24 (Mon) 11:00||E6-2, #1323||Dr. Henning Schomerus||Topological photonic anomalies|
|120||July 25(Thur.),4:00PM||E6-2, #1323||Prof.Bohm-Jung Yang||Band topology of twisted bilayer graphene|
|119||July 31(Wed.)/ 16:00||E6-2, #1323||Dr. Ivan Borzenets||Features of ballistic superconducting graphene|
|118||2015/08/03,10:30AM||E6-2, #1323 (Seminar Room)||Dr. Jonghee Yoo (Fermi National Accelerator Laboratory, USA )||Axion Search|
|117||2015/10/23, 3PM||E6-2, #5318||Dr. Helmut Soltner (Forschungszentrum Juelich)||Development of a Rogowski Coil as a new beam position monitor|
|116||2015/11/06, 4:30 PM||E6-2, #5318||Dr. Youngkuk Kim (University of Pennsylvania)||Topological Dirac line nodes in centrosymmetric semimetals|
|115||February 12(Web.)||E6-2, #5318||Prof. Kunio Kaneta||From inflation to new weak-scale|