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)
545 2015-09-15 16:00    Physics Colloquium : 2014 Fall file
544 2022-03-14 16:00    Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
543 2023-04-27 16:00    (광학분야 세미나)On-chip spectrometers based on CMOS image sensors
542 2021-05-27 16:00    찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
541 2016-03-11 13:30    Physics Seminar Serises : 2016 Spring file
540 2022-11-03 16:00    (광학분야 세미나) Single-photon emission from low-dimensional materials
539 2015-09-07 16:00    Physics Colloquium : 2015 Fall file
538 2025-03-28 11:00  명노준 교수 (조선대)  Quantum Transport in Strained-Engineered Graphene: Mesoscopic Perspective of Tunable Quantum Information Devices file
537 2025-05-15 16:00  노찬 박사(KAIST)  Generation of multimode Gaussian quantum states and their applications for quantum computing file
536 2022-04-11 16:00    Emergence of Statistical Mechanics in Quantum Systems
535 2022-04-04- 16:00    New paradigms in Quantum Field Theory
534 2022-05-09 16:00    Searching for new electronic properties in correlated material flatland
533 2022-05-23 16:00    Novel electronic transport in topological van der Waals magnets
532 2011-09-03 16:00    Physics Colloquium : 2011 Fall file
531 2022-10-13 16:00    (광학분야 세미나) Ultrafast Optics for Ultra-Precision Metrology and Realization of Flexible/Stretchable Laser-Induced-Graphene Electronics
530 2020-11-12 16:00    2020 가을학기 광학분야 특별세미나
529 2022-10-07 11:00    [Update 세미나 영상] (응집물리 세미나) Competing orders in a vanadium-based kagome metal monolayer file
528 2022-10-28 11:00    [Update 세미나영상] (응집물리 세미나) Machine-Learning-Guided Prediction models and Materials discovery for high Tc cuprates file
527 2017-10-10 16:00    Discovery of New 2D Materials with Diverse Physical Properties
526 2023-04-06 16:00    (광학분야 세미나)Nanophotonics-based approaches to explore Berry physics