visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Isostatic magnetism

2016.07.04 22:02

Physics 조회 수:7879

날짜 2016-07-08 11:00 
연사  
장소 #1323(E6-2. 1st fl.) 

Isostatic magnetism

 

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[1] and fabricated as a metamaterial[2]. 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[3] 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.


[1] C. L. Kane and T. C. Lubensky, "Topological boundary modes in isostatic lattices", Nature Physics 10, 39 (2013).
[2] B. G. Chen, N. Upadhyaya, V. Vitelli, "Non-linear conduction via solitons in a topological mechanical insulator", PNAS 111, 13004 (2014).
[3] M. J. Lawler "Supersymmetry protected phases of isostatic lattices and kagome antiferromagnets", Unpublished, see arXiv:1510.03697.


Contact: Eun Gook Moon, Physics Dept., (egmoon@kaist.ac.kr)

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
254 2019-08-27 16:00    Critical current properties of Fe-based superconductors file
253 2019-08-22 16:00    Physics and Applications in Nanoelectronics and Nonomechanics file
252 2019-08-19 10:00    Tutorials on Multimode Quantum Optics in the Continuous Variable Regime file
251 2019-08-16 14:00    Multiferroic and Magnetoelectric Effects by Tailoring Interfacial Chemistry and Physics in Correlated Oxides file
250 2019-08-14 16:00    Quantum Optics, at the heart of quantum metrology and quantum information file
249 2019-08-06 16:00    Visualization of in-plane piezoresponse vector fields file
248 2019-08-01 14:00    Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy file
247 2019-07-31 16:00    Features of ballistic superconducting graphene file
246 2019-07-30 16:00    Dirac fermions and flat bands in correlated kagome metals file
245 2019-07-25 16:00    Band topology of twisted bilayer graphene file
244 2019-07-21 12:00    Challenges and Opportunities in Theoretical Particle Physics 2019 file
243 2019-07-16 16:00    2019 Physics Distinguished Lecture file
242 2019-07-10 16:00    Public Lectures file
241 2019-07-08 14:00    Ultrabroadband squeezed pulses and their relation to relativity file
240 2019-07-03 15:00    Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics" file
239 2019-06-28 14:00    1st Research-exchange meeting of computational material physics file
238 2019-06-28 13:30    Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures file
237 2019-06-27 14:00    Gapless Kitaev Spin Liquid to Loop and String Gases file
236 2019-06-24 11:00    Topological photonic anomalies file
235 2019-06-17 10:30    Chiral Spintronics file