visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Isostatic magnetism

2016.07.04 22:02

Physics 조회 수:7887

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[3] M. J. Lawler "Supersymmetry protected phases of isostatic lattices and kagome antiferromagnets", Unpublished, see arXiv:1510.03697.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)
485 2021-06-11 14:30    Engineering sound waves and vibrations in multi-mode nanomechanical systems file
484 2019-09-27 16:00    0D/1D/2D/3D III-V materials grown by MBE for Optelectronics file
483 2018-03-16 14:30    산화물 다층박막에서의 다양한 물리현상 file
482 2018-03-16 14:30    산화물 다층박막에서의 다양한 물리현상 file
481 2016-12-8 16:00    Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator
480 2023-05-22 13:00    Design & Development of Electrochemical Biosensors for the Detection of T2DM Biomarkers
479 2017-03-02 16:00    “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”
478 2019-12-03 16:00    Toward Quantum Materials with Correlated Oxides file
477 2016-04-01 16:15    Cotunneling drag effect in Coulomb-coupled quantum dots
476 2015-08-03 10:30    Axion Search
475 2016-11-04 13:30    Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications
474 2018-10-19 10:00    Energy conversion processes during magnetic reconnection in a laboratory plasma file
473 2018-12-07 16:00    Novel probes of interacting electrons in 2D systems file
472 2019-09-27 14:30    Spin-charge conversion in topological insulators for spintronic applications file
471 2022-11-04 16:30    초세대 협업연구실 Quantum- & Nano-Photonics_Multifunctional neural probes with integrated nanophotonics file
470 2019-11-01 16:00    Electron transport through weak-bonded contact metal with low dimensional nano-material file
469 2024-06-12 13:30    Competition between superconductivity and density waves in spin-degenerate and spin-orbit-coupled Bernal bilayer graphene
468 2017-07-14 15:00    Chiral anomaly in disordered Weyl semimetals file
467 2018-07-27 13:30    Magnetic reversal of artificial spin ice file
466 2018-07-27 13:30    Magnetic reversal of artificial spin ice file