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
공지 2022-10-24 16:00  E6 #1501(공동강의실)  Physics Colloquim(Fall 2022)
공지 2022-09-21 10:30  E6-1 #1501  [Update 세미나 영상] Distinguished Lecture 'The Magic of Moiré Quantum Matter' Prof. Pablo Jarillo-Herrero(Department of Physics, MIT)
공지 2022-11-11 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Honeycomb oxide heterostructures for quantum spin liquid
공지 2022-10-28 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Machine-Learning-Guided Prediction models and Materials discovery for high Tc cuprates
공지 2022-10-07 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Competing orders in a vanadium-based kagome metal monolayer
공지 2022-09-23 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Steady Floquet-Andreev states in graphene Josephson junctions
공지 2022-09-22 11:00  E6-1 #1323  2022 가을학기 응집물리 및 광학 세미나 전체 일정
436 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
435 2019-03-21 16:00  RM. 1323, E6-2  Spring 2019: Physics Seminar Serises file
434 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
433 2019-09-02 16:00  Seminar Room 1501  Fall 2019: Physics Colloquium file
432 2022-03-29 10:00  E6 #1501/zoom, E6 #2502/zoom  Non-reciprocal phase transitions file
431 2022-03-31 10:00  E6 #1501/zoom  Weiss fields for Quantum Spin Dynamics file
430 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
429 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
428 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
427 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
426 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
425 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
424 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
423 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
422 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
421 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
420 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
419 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
418 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
417 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file