• HOME
  • >
  • 소식
  • >
  • 세미나
장소 E6 #1501/online 
일시 Jan. 25th (Tue), 15:00 
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

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, (


Department of Physics, KAIST


번호 일시 장소 연사 제목
176 Jul. 07 (Thu.) 2PM  #1323(E6-2. 1st fl.)  Dr. Eun Ah Kim, CORNELL UNIV.  Let there be topological superconductors
175 Jul 3rd, 2019 (Wed)  E6-2, 2501  Kyung Soo Choi  Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics" file
174 January 23, 2019  Rm. C303, Creation Hall (3F), Munji Campus  Mikko Mottonen  Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors file
173 January 17 (Fri), 4:00 PM  #1323, E6-2  Hiroki Ikegami  Symmetry Breaking and Topology in Superfluid 3He file
172 Jan.9 (Wed.), 04:00 PM  E6-2. 2nd fl. #2501  Dr. Heung-Sik Kim  Molecular Mott state in the deficient spinel GaV4S8 file
171 Jan.28(Thu), 06:00PM  Online Seminar  Alexandre Zagoskin(Loughborough Univ.)  Quantum metamaterials: concept, theory, prototypes and possible applications file
170 Jan.28(Thu), 03:00PM  Zoom  Yaroslav Tserkovnyak (UCLA)  Topological Transport of Deconfined Hedgehogs in Magnets file
169 JAN. 7 (Mon), 03:00 PM  E6-2. 2st fl. #2501  Dr. Byoung min Kang  Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
168 Jan. 26th (Tue), 13:00  E6 #1501  Dr. Hyojin Jung (NIMS)  An Introduction to Cohomology groups file
» Jan. 25th (Tue), 15:00  E6 #1501/online  Junhyun Lee (Rutgers, the State University of New Jersey)  Emulating twisted double bilayer graphene with a multiorbital optical lattice file
166 Jan. 18(Tue), 2pm-3pm  KI bldg. 5th fl. Room B501 & Zoom  YoungJu Jo (Stanford University)  Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo file
165 Jan. 17(Mon) - 21 (Fri), 2-4pm  E6-2 Room 2502  Dr. Donghui Jeong (Penn State University)  Five Lectures on Observational Probes of Dark Energy file
164 Jan. 11th(Tue), 15:00  E6 #1501  Soyeun Kim(UIUC)  Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
163 Jan 12th (Wed), 11:00 AM  Zoom and E6 #1323  Joonseok Hur (MIT)  Spectroscopic study of trapped ions towards probing dark matter and new physics file
162 February 21 (Thu.), 16:00 PM  #5313, E6-2  Prof. Diptimoy Ghosh  B-meson charged current anomalies - Theoretical status file
161 February 20 (Thu), 4:00 PM  #1323, E6-2  Seunghyun Khim  Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
160 February 13th (Thur.), 16:30 PM  E6-6, #119  Dr. Seyoon Kim(University of Wisconsin-Madison)  Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file
159 February 12(Web.)  E6-2, #5318  Prof. Kunio Kaneta  From inflation to new weak-scale file
158 Feb.17(Wed)~19(Fri), 09:00~11:00AM  Online  Prof. Subir Sachdev (Harvard University)  석학 대중 강연 및 강의 시리즈 file
157 Feb.15(Mon), 05:00PM  Zoom  Yoshichika Otani(Tokyo Univ.)  Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file