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
211 2021-03-25 16:00  Online Seminar (Zoom)  Search for dark matter axion with Rydberg atoms file
210 2021-04-02 14:30  Online(Zoom)  Quantum computing and entanglement generation using trapped ions and photons
209 2021-04-02 16:00  Online(Zoom)  Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy
208 2021-04-09 10:00  Zoom webinar  Integrated Lithium Niobate Photonics file
207 2021-04-19 19:00  Zoom webinar  Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
206 2021-05-14 14:30  Online seminar  Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions file
205 2021-05-14 16:00  Online seminar  Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
204 2021-05-17 17:00  Zoom webinar  Spin current generation and detection in uniaxial antiferromagnets file
203 2021-05-27 16:00  온라인  찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
202 2021-06-08 10:00  Zoom webinar  Photonic crystal devices for sensing file
201 2021-06-11 14:30  Online seminar  Engineering sound waves and vibrations in multi-mode nanomechanical systems file
200 2021-06-11 16:00  Online seminar  Pseudogap in surface-doped black phosphorus file
199 2021-06-22 17:00  Zoom webinar  Spintronics meets Quantum Materials file
198 2021-07-29 14:00  Online seminar  Gravitationally Induced Dark Sector and Inflationary Dynamics file
197 2021-11-02 16:00  자연과학동(E6-2) #1323  Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
196 2021-12-03 14:30  Zoom webinar  Topological Spin Textures: Skyrmions and Beyond file
195 2021-12-03 16:00  Zoom webinar  Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
194 2022-01-11 15:00  E6 #1501  Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
193 2022-01-12 11:00  Zoom and E6 #1323  Spectroscopic study of trapped ions towards probing dark matter and new physics file
192 2022-01-17 14:00  E6-2 Room 2502  Five Lectures on Observational Probes of Dark Energy file