visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Isostatic magnetism

2016.07.04 22:02

Physics 조회 수:1711

날짜 2016-07-08 11:00 
일시 Jul. 08 (Fri.) 11:00 AM 
장소 #1323(E6-2. 1st fl.) 
연사 Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.) 

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[3] M. J. Lawler "Supersymmetry protected phases of isostatic lattices and kagome antiferromagnets", Unpublished, see arXiv:1510.03697.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 장소 제목
59 2019-06-17 10:30  #1323, E6-2  Chiral Spintronics file
58 2019-06-28 13:30  #1323, E6-2  Magnetic domains and domain wall conduction in pyrochlore iridate thin films and heterostructures file
57 2019-07-30 16:00  #1323, E6-2  Dirac fermions and flat bands in correlated kagome metals file
56 2019-08-22 16:00  #1323, E6-2  Physics and Applications in Nanoelectronics and Nonomechanics file
55 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
54 2019-09-26 16:00  #1323, E6-2  Entanglement Swapping with Autonomous Polarization-Entangled Photon-Pairs from Warm Atomic Ensemble file
53 2019-10-15 16:00  #1323, E6-2  Moiré superlattices and graphene quasicrystal file
52 2019-10-17 16:00  #1323, E6-2  Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing file
51 2019-10-25 15:00  #1323, E6-2  Physics Seminar file
50 2019-10-29 14:30  #1323, E6-2  Quantum sensing file
49 2019-11-05 16:00  #1323, E6-2  Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
48 2019-11-07 16:00  #1323, E6-2  Integrated quantum photonics with solid-state quantum emitters file
47 2020-01-17 16:00  #1323, E6-2  Symmetry Breaking and Topology in Superfluid 3He file
46 2020-02-20 16:00  #1323, E6-2  Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
45 2017-03-02 16:00  #1323(E6-2. 1st fl.)  “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”
44 2016-04-19 14:00  #1323(E6-2. 1st fl.)  Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability
» 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
42 2016-07-07 14:00  #1323(E6-2. 1st fl.)  Let there be topological superconductors
41 2016-07-08 14:00  #1323(E6-2. 1st fl.)  Electronic quasiparticles in the quantum dimer model
40 2016-07-28 16:00  #1323(E6-2. 1st fl.)  Low Dimensional Electrons: On the Road to Hybrid Quantum Systems