visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2024-06-12 16:00 
일시 Jun 12th (Wed), 4:00pm 
장소 E6-2, #1323 
연사 Dr. Hanbit Oh (Johns Hopkins University) 

아래와 같이 세미나를 개최하고자 하오니, 관심있는 분들의 많은 참석 부탁드립니다.

 

Date: 4:00 pm, 12th Jun (Wed)
Place: E6-2, #1323
Speaker: Dr. Hanbit Oh (Department of Physics and Astronomy, Johns Hopkins University)
Title: New high Tc superconductivity and symmetric pseudogap metal in the bilayer nickelate La3Ni2O7-Part2
Abstract: 

The recent discovery of an 80 K superconductor in La3Ni2O7 has attracted considerable interest. While numerous theoretical frameworks have been proposed, most assume that bilayer nickelates reside in the Mott-Hubbard regime. However, recent experiments suggest that La3Ni2O7 may belong to the charge transfer regime.  In the first part of the talk, I present the charge transfer regime of the bilayer nickelates by accounting for doped holes entering the oxygen p orbitals. Interestingly, we show that the Zhang-Rice doublon state emerges as the proper low-energy degrees of freedom for the hole-doped state, distinct from the Zhang-Rice singlet in hole-doped cuprates [3].  The low energy theory in the charge transfer regime is also demonstrated as a bilayer type-II t-J model previously proposed in the Mott- Hubbard regime. Given the richness of this physics, there is a natural desire to simulate the superconductivity using programmable quantum simulators to explore diverse physics phenomena. In the second part of the talk, I present a theoretical proposal to utilize the tetralayer optical lattice systems with ultracold atoms to simulate novel bilayer nickelate superconductors. Notably, the synthetic Kondo interaction simulated in the cold atom system is antiferromagnetic, contrasting with the ferromagnetic Hund coupling inherent in nickelate materials. This difference in the sign of the Kondo interaction enhances the pairing gap, equivalently to Tc allowing us to detour the challenge of reaching ultra-low temperatures in cold atom experimental setups. We further propose a signature to identify the pairing state can be applied to the snapshot measurements.

[1] Hanbit Oh and Ya-Hui Zhang, Phys. Rev. B 108 (2023)

[2] Hui Yang*, Hanbit Oh*, Ya-Hui Zhang, arXiv:2309.15095 (2023)

 

[2] Hanbit Oh, Boran Zhou, Ya-Hui Zhang, arXiv:2405.00092 (2024)

번호 날짜 장소 제목
563 2024-10-17 16:00  온라인 (https://kaist.zoom.us/j/89289652931?pwd=eNz6xnTFrEMGXYj9fXpdBJsW9fEpJX.1)  Photonic Methods for Quantum Levitodynamics Beyond the Rayleigh Regime
562 2024-10-14 11:00  KI Building(E4), Matrix Hall(2nd Floor)  [RSVP, Oct 14th Mon] Ambassador of Hungary to Republic of Korea Special Lecture file
561 2024-10-02 12:00  E6-2, #3441  Data-driven discovery of neural computations through brain-wide and cell-type-specific dynamical systems file
560 2024-09-26 14:00  KAIST, Physics Bldg. (E6-2) / (Rm. 3441)  Quantum spin nematic phase in a square-lattice iridate
559 2024-09-03 12:00  자연과학동(E6-2) 1323  2024 가을학기 물리학과 특별세미나 전체 일정 (응집물리 및 광학분야) file
558 2024-09-02 16:00  자연과학동 1501호(공동강의실)  2024학년도 가을학기 물리학과 콜로키움(Physics Colloquium) file
557 2024-08-22 16:00  RM #C303, Creation Hall (3F), KAIST Munji Campus  [CAPP seminar] Development of a 12-20 GHz CO Intensity Mapping Receiver for Capturing the Star-formation History in the Early Universe file
556 2024-08-16 11:00  E6 1322 (no zoom broadcasting)  Cathodoluminescence for nanophotonics: Applications to plasmonic bandgap materials and perovskite semiconductors file
555 2024-08-14 11:00  E6, #3441  Pair Density Waves and Supercurrent Diode Effect in Altermagnets
554 2024-07-25 16:00  Rm. 3441, E6-2 (Advanced Physics Lecture Hall)  Generation and Certification of Optical Quantum States for Information Processing file
553 2024-07-23 16:00  KI Building(E4) Matrix Hall(2F)  Spin Conversion Research Towards Novel Spintronic Functionalities file
552 2024-07-22 14:00  E6-2 #3441  Nonthermal electronic orders in photo-doped Mott insulators
551 2024-07-18 11:00  E6-2 #1323  Acousto-electric non-local detection of magnon-phonon coupling
550 2024-07-10 16:00  E6-2 #2502  [High Energy Theory Seminar] The Weak Gravity Conjecture in Perturbative String Theory
549 2024-07-03 16:00  E6-2 #2502  [High Energy Theory Seminar] Holographic duals of Higgsed Dpb(BCD)
548 2024-06-13 16:00  E6-2, #1323  Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
547 2024-06-13 16:00  Zoom  [CAPP seminars]Simulation, design and fabrication of Josephson Parametric Amplifiers for axion search file
» 2024-06-12 16:00  E6-2, #1323  New high Tc superconductivity and symmetric pseudogap metal in the bilayer nickelate La3Ni2O7-Part2 file
545 2024-06-12 13:30  E6, #1501  Competition between superconductivity and density waves in spin-degenerate and spin-orbit-coupled Bernal bilayer graphene
544 2024-06-05 10:00  E6, #2501  Moir\’e fractals in supermoir\’e structures