visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-09-22 14:30 
연사  
장소 E6-2. 1st fl. #1323 

Quantum Electronic Transport in Graphene Hybrid Nanostructures

 Dr. GilHo Lee / Department of Physics, POSTECH

 Sep. 22 (Fri.), 02:30 PM

E6-2. 1st fl. #1323

 

 

Abstract: 

Ever since discovered, graphene has brought in high-energy relativistic quantum mechanics to low-energy condensed matter system. Exploiting its unique relativistic characters and electrostatic tunability, ballistic graphene has a great potential leading us to novel electronic optical quantum devices. When electrons tunnel p-n barriers, that is termed by Klein tunneling, they exhibit negative refraction in order to conserve their pseudo-spins. Based on this unique phenomenon, 1) Veselago’s lens was demonstrated in the graphene heterostructure of two sharp p-n barriers. 2) We also demonstrated a quantum switch based on Dirac-fermion optics, where strong angle dependence of Klein tunneling probability enabled collimators and mirrors for electrons. Through systematic measurements, we isolated the net optical contribution and extract a full set of transmission coefficient, demonstrating clear evidences of Dirac fermions’ optical characteristics. Lastly, 3) we firstly induced superconducting correlations in the quantum Hall states in the superconducting heterostructure of high quality graphene. Such heterostructures were suggested to realize emergent excitations of non-Abelian anyons, although its experimental understanding has been lacking so far due to the incompatibility between superconducting and quantum Hall phases. We will discuss this system in terms of a unique platform for realizing universal and scalable topological quantum computers.

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)
325 2023-11-30 10:30    [High-Energy Theory Seminar] 3d-3d correspondence and 2d N = (0,2) boundary conditions
324 2024-08-16 11:00    Cathodoluminescence for nanophotonics: Applications to plasmonic bandgap materials and perovskite semiconductors file
323 2020-01-17 16:00    Symmetry Breaking and Topology in Superfluid 3He file
322 2019-08-27 16:00    Critical current properties of Fe-based superconductors file
321 2024-09-26 14:00    Quantum spin nematic phase in a square-lattice iridate
320 2019-08-01 14:00    Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy file
319 2024-02-16 10:00    Optical conductivity of superconducting states driven by Van Hove singularities
318 2020-12-11 16:00    Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
317 2016-06-16 16:00    Quantum information processing using quantum dots and photonic crystal cavities
316 2019-06-27 14:00    Gapless Kitaev Spin Liquid to Loop and String Gases file
315 2024-12-17 15:00  Isaac H. Kim  Learning state preparation circuit for quantum phases of matter (Isaac H. Kim, UC Davis)
314 2025-03-14 14:00  Jeonghee Rho (SETI Institute)  JWST Imaging and Spectroscopy of the Supernova Remnant Cassiopeia A and Molecule and Dust Formation file
313 2019-05-08 16:00    Imaging valley dependent electron transport in 2D semiconductors file
312 2019-05-08 16:00    Imaging valley dependent electron transport in 2D semiconductors file
311 2021-05-17 17:00    Spin current generation and detection in uniaxial antiferromagnets file
310 2019-08-16 14:00    Multiferroic and Magnetoelectric Effects by Tailoring Interfacial Chemistry and Physics in Correlated Oxides file
309 2023-07-10 16:00    Electronic structures of magnetic and non-magnetic ordering in d- and f-electrons systems
308 2022-05-19 15:00    (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
307 2022-05-19 15:00    (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
306 2024-11-30 10:30  Joon Young Park  Towards probing topological phases in Corbino-geometry Josephson junctions on a topological insulator surface