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 2017-08-16 16:00  #1322 (E6-2. 1st fl.)  Phonon-driven spin-Floquet valleytro-magnetism file
541 2017-03-24 16:00  #1323 (1st fl. E6-2)  Graphene based nano electronics and nano electromechanics; focusing on precise control of nano structures for studying accurate physical properties
540 2017-03-24 14:30  #1323 (1st fl. E6-2).  Topological Dynamics
539 2017-11-03 14:30  #1323 (1st fl., E6-2.)  Quantum Resistor-Capacitor Circuit with Majorana Edge States file
538 2017-11-03 16:00  #1323 (1st fl., E6-2.)  Expedition to the Kitaev Quantum Spin Liquid: Hunting for Majorana fermions file
537 2016-06-14 15:00  #1323 (E6-2 1st fl.)  No-Insulation High Temperature Superconductor Magnet Technology for Compact, Reliable, and Low-Cost High Field DC Magnets
536 2019-10-29 10:00  #1323 (E6-2, 1st fl.)  Unconventional Spin Transport in Quantum Materials file
535 2018-04-13 10:00  #1323 (E6-2, 1st fl.)  Quantum meets Mechanics: from Quantum Information to Fundamental Research file
534 2018-04-11 16:00  #1323 (E6-2, 1st fl.)  Non-Gaussian states of multimode light generated via hybrid quantum information processing file
533 2019-10-16 16:00  #1323 (E6-2, 1st fl.)  Emergent black holes and monopoles from quantum fields file
532 2019-10-29 16:00  #1323 (E6-2, 1st fl.)  Particles and Gravity via String Geometry file
531 2019-10-31 10:00  #1323 (E6-2, 1st fl.)  Kondo meets Hubbard: Impurity physics for correlated lattices file
530 2018-04-11 13:30  #1323 (E6-2, 1st fl.)  Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
529 2017-09-13 16:00  #1323 (E6-2. 1st fl.)  An Introduction to Quantum Spin Liquids file
528 2017-04-28 16:00  #1323 (E6-2. 1st fl.)  Carbon nanotubes coupled to superconducting impedance matching circuits
527 2017-07-14 15:00  #1323 (E6-2. 1st fl.)  Chiral anomaly in disordered Weyl semimetals file
526 2017-06-02 16:00  #1323 (E6-2. 1st fl.)  Maxwell's demon in quantum wonderland file
525 2017-09-26 11:00  #1323 (E6-2. 1st fl.)  Time-resolved ARPES study of Dirac and topological materials
524 2017-09-12 16:00  #1323 (E6-2. 1st fl.)  Exact Solution for the Interacting Kitaev Chain at Symmetric Point file
523 2017-11-28 16:00  #1323 (E6-2. 1st fl.)  Physics after the lab and the desk: Your work in PRL file