visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-09-22 14:30 
일시 Sep. 22 (Fri.), 02:30 PM 
장소 E6-2. 1st fl. #1323 
연사 Dr. GilHo Lee / Department of Physics, POSTECH 

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 장소 제목
542 2018-09-07 15:00  학술문화관 (E9), 2층 양승택 오디토리움  Recent developments in density functional theory: From new functionals to the nature of the chemical bond file
541 2016-05-17 11:00  창의학습관(E11), 406호  The CERN Resonant WISP Search: Development, Results and Lesson-Learned
540 2022-05-13 16:00  자연과학동(E6-2) 1st fl. #1323  High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
539 2021-11-02 16:00  자연과학동(E6-2) #1323  Metrology of Band Topology via Resonant Inelastic X-ray Scattering file
538 2017-12-13 13:30  자연과학동 대형강의실 (1501호)  KAIST-KIAS Joint Workshop in Theoretical Sciences 개최 file
537 2021-05-27 16:00  온라인  찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
536 2018-08-01 11:00  양분순 빌딩 (E16-1) 207호  Future of AI: Is the brain a computer? file
535 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
534 2020-09-14 17:30  Zoom webinar  KAIST Global Forum for Spin and Beyond (Third Forum) file
533 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
532 2020-09-22 09:30  Zoom webinar  Physics and applications of soliton microcombs(Quantum- & Nano-Photonics) file
531 2021-06-08 10:00  Zoom webinar  Photonic crystal devices for sensing file
530 2020-08-17 20:00  Zoom webinar  Using magnetic tunnel junctions to compute like the brain file
529 2021-04-19 19:00  Zoom webinar  Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
528 2020-08-25 20:00  Zoom webinar  KAIST Global Forum for Spin and Beyond (Second Forum) file
527 2020-09-28 17:30  Zoom webinar  KAIST Global Forum for Spin and Beyond(Fourth Forum) file
526 2021-12-03 16:00  Zoom webinar  Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
525 2021-05-17 17:00  Zoom webinar  Spin current generation and detection in uniaxial antiferromagnets file
524 2021-12-03 14:30  Zoom webinar  Topological Spin Textures: Skyrmions and Beyond file
523 2021-04-09 10:00  Zoom webinar  Integrated Lithium Niobate Photonics file