visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-01-25 15:00 
연사  
장소 E6 #1501/online 

 

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 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)
406 2016-04-19 14:00    Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability
405 2023-08-24 11:00    Advancing magnonic metamaterials: spin waves in nanomagnetic arrays
404 2024-05-28 10:00    Mixed-State Quantum Spin Liquids and Dynamical Anyon Condensations in Kitaev Lindbladians
403 2019-11-28 16:00    Generation of coherent EUV emissions using ultrashort laser pulses file
402 2022-05-20 11:00    (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals
401 2019-05-09 16:00    Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
400 2019-05-09 16:00    Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
399 2020-02-12 13:00    From inflation to new weak-scale file
398 2025-05-22 14:30  Prof. Keun Su Kim (The Univ. of Yonsei)  Sublattice-interference model for Fermi arcs in cuprates file
397 2018-10-24 10:30    Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers file
396 2018-06-14 10:00    Phonons and polariton-like particles in trapped ions for quantum computation and quantum simulation file
395 2018-12-16 16:00    Lectures on 2d Conformal Field Theory file
394 2023-11-22 16:00    [High Energy Theory Seminar] Renormalization and the Hierarchy Problem
393 2024-08-22 16:00    [CAPP seminar] Development of a 12-20 GHz CO Intensity Mapping Receiver for Capturing the Star-formation History in the Early Universe file
392 2022-12-20 16:00    Getting into Biology and Medicine as Physicist
391 2019-03-26 15:00    Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets file
390 2022-06-03 09:30    (Quantum-&Nano-Photonics Webinar) Seeing glass in a new light: reimagine chalcogenide photonics file
389 2018-10-11 16:00    Dirac electrons in a graphene quasicrystal file
388 2019-10-29 14:30    Quantum sensing file
387 2025-05-02 11:00  Prof. Joonho Jang  Anderson localization of electrons in a moire-of-moire lattice of helical twisted trilayer graphene file