|일시||Jul. 08 (Fri.) 11:00 AM|
|장소||#1323(E6-2. 1st fl.)|
|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 M. J. Lawler "Supersymmetry protected phases of isostatic lattices and kagome antiferromagnets", Unpublished, see arXiv:1510.03697.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)
|151||2022-07-14 15:00||E6 #1501 & Zoom||Pure two-dimensional quantum electron liquid and its phase transition|
|150||2022-01-11 15:00||E6 #1501||Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I|
|149||2022-01-26 13:00||E6 #1501||An Introduction to Cohomology groups|
|148||2022-04-13 10:30||E6 #1323/zoom||Harnessing topology and correlations from singularities in 3d-kagome metals|
|147||2023-05-17 14:00||E6 #1323||Optical Response in the multilayer thin films|
|146||2023-04-28 11:00||E6 #1323||Tkachenko wave: From the modern field theory viewpoint|
|145||2022-10-06 13:00||E6 #1323||Counting States with Global Symmetry|
|144||2015-07-23 13:30||E4, B401||Enhanced ZnO based UV photonics and related applications|
|143||2015-12-17 11:00||E4(KI Building), Matrix Hall (2nd fl.)||Wavefront engineering for in-vivo Deep brain imaging|
|142||2015-12-09 11:00||E4(KI Building), Connect room (2nd fl.)||Functional Imaging & Monitoring of Brain & Breast with Diffuse Light|
|141||2015-03-13 14:00||Connect Room, KI Bldg.||The 15th Innovative Workshop on Soft/Bio Materials|
|140||2022-09-21 16:00||College of Natural Science E6-2, Rm. 1323||Materials and Device Nanofabrication of Optical Metasurfaces|
|139||2023-09-21 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP seminar] Axion Magnetic Resonance|
|138||2023-09-14 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP seminar] Dark matter searches in Water Cherenkov Detectors|
|137||2023-09-18 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP Seminar] Searching for axions in quantum vacuum birefringence|
|136||2023-05-15 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||Role of dark Higgs boson in DM physics and cosmology|
|135||2023-06-14 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP seminar] EMC at CERN|
|134||2023-06-22 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP Seminar] The muon g-2 puzzle|
|133||2023-07-26 10:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio|
|132||2023-06-15 16:00||CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus||[CAPP Seminar] Cryogenic electronics for ion traps|