visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-01-25 15:00 
일시 Jan. 25th (Tue), 15:00 
장소 E6 #1501/online 
연사 Junhyun Lee (Rutgers, the State University of New Jersey) 

 

Physics Seminar

 

 

 

 

Emulating twisted double bilayer graphene with a multiorbital optical lattice

 

 

Junhyun Lee

Department of Physics and Astronomy,

Rutgers, the State University of New Jersey

 

Jan. 25th (Tue), 15:00, E6 #1501/online

https://us02web.zoom.us/j/84917344494?pwd=ZlBaNWNhVlYwYUY5RnRoQ2Q2MWp0dz09

회의 ID:  849 1734 4494

암호: 890800

 

We theoretically explores how to emulate twisted double bilayer graphene with ultracold atoms in multiorbital optical lattices. In particular, the quadratic band touching of Bernal stacked bilayer graphene is emulated using a square optical lattice with px, py, and dx2y2 orbitals on each site, while the effects of a twist are captured through the application of an incommensurate potential. The quadratic band touching is stable until the system undergoes an Anderson like delocalization transition in momentum space, which occurs concomitantly with a strongly renormalized single particle spectrum inducing flat bands, which is a generalization of the magic-angle condition realized in Dirac semimetals. The band structure is described perturbatively in the quasiperiodic potential strength, which captures miniband formation and the existence of magic-angles that qualitatively agrees with the exact numerical results in the appropriate regime. We identify several magic-angle conditions that can either have part or all of the quadratic band touching point become flat. In each case, these are accompanied by a diverging density of states and the delocalization of plane wave eigenstates. It is discussed how these transitions and phases can be observed in ultracold atom experiments.

 

Contact: Eunjung Jo, (jojo@kaist.ac.kr)

 

Department of Physics, KAIST

 

번호 날짜 장소 제목
362 2022-12-20 16:00  E6-2. #2501  Getting into Biology and Medicine as Physicist
361 2022-12-20 16:00  E6-2.1st fl. #1323 & zoom  Studying Baryonic Flow Across the Cosmic Scales Using Radio and Millimeter Wavelength Experiments
360 2018-12-26 16:00  E6-1. 3rd fl. #3434  Informal Workshop on Topology and Correlation file
359 2018-12-26 16:00  E6-2. 1st fl. #1323  Brane-like defect in 3D toric code file
358 2018-12-27 16:00  E6-2. 1st fl. #1323  Quantum Innovation (QuIN) Laboratory file
357 2021-12-03 14:30  Zoom webinar  Topological Spin Textures: Skyrmions and Beyond file
356 2021-12-03 16:00  Zoom webinar  Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
355 2018-12-07 14:30  E6-2. 1st fl. #1323  Spin generation from heat and light in metals file
354 2018-12-07 16:00  E6-2. 1st fl. #1323  Novel probes of interacting electrons in 2D systems file
353 2022-12-07 16:00  E6-2 #1323  (광학분야 세미나) Non-Hermitian physics and non-Hermitian singularity
352 2016-12-8 16:00  #1323(E6-2. 1st fl.)  Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator
351 2022-12-09 11:00  E6-2 #1323  [Update 세미나영상](응집물리 세미나) Single-shot measurements of strongly-correlated artificial molecular levels in semiconductor quantum dots file
350 2016-12-09 13:30  #1323(E6-2. 1st fl.)  Entanglement area law in strongly-correlated systems
349 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
348 2020-12-10 13:55  Zoom  Consistency of Boltzmann equation and light dark matter from inflaton decay
347 2020-12-23 10:00  Online  Online workshop for Quantitative Phase Imaging file
346 2020-12-09 10:00  Zoom  Searching for the QCD axion with the ARIADNE experiment file
345 2023-12-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Superconducting qubits for large-scale quantum computers file
344 2019-12-13 13:00  #2501, E6-2  Computational Material Designs: Current Status and Future Directions file
343 2019-12-13 13:30  #1323, E6-2  Biophysics Mini-symposium at KAIST file