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)
506 2022-01-26 13:00    An Introduction to Cohomology groups file
505 2018-10-12 16:00    Direct observation of a two-dimensional hole gas at oxide interfaces file
504 2022-11-18 14:30    Kondo cloud condensation in a highly-doped semiconductor metal file
503 2025-05-01 16:00  Dr. Inwook Kim (Lawrence Livermore National Laboratory)  BSM Physics Search with Quantum Sensors file
502 2018-12-26 16:00    Brane-like defect in 3D toric code file
501 2019-07-31 16:00    Features of ballistic superconducting graphene file
500 2018-07-12 17:00    The MilliQan Experiment: Search for Milli-Charged Particles at the LHC
499 2016-12-09 13:30    Entanglement area law in strongly-correlated systems
498 2023-11-23 16:00    Deciphering the Enigma of Quantum Materials by X-ray Scattering and Spectroscopy
497 2019-10-16 16:00    Emergent black holes and monopoles from quantum fields file
496 2022-07-14 13:30    Electronic structure and anomalous transport properties of topological materials by first principle calculation
495 2016-11-24 16:00    Harmonic oscillator physics with single atoms in a state-selective optical potential
494 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
493 2021-05-14 16:00    Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
492 2016-04-12 16:00    Confinement of Superconducting Vortices in Magnetic Force Microscopy
491 2017-04-28 14:30    Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
490 2015-12-11 15:45    Dynamical mean field theory studies on heavy fermion system
489 2023-10-19 11:00    Emergent functionalities of iridium oxide films with different growth orientation file
488 2023-06-26 11:00    Quantum computing on magnetic racetracks with flying domain wall qubits
487 2019-04-19 11:00    First-principles studies of semiconductors for solar cell applications file