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)
366 2025-04-29 16:00  Dr. Tokuro Shimokawa (Okinawa Institute of Science and Technology)  Can experimentally-accessible measures of entanglement distinguish quantum spin liquid and random singlet phases? file
365 2018-10-16 10:00    Capturing protein cluster dynamics and gene expression output in live cells file
364 2023-02-28 11:00    Topotactic redox engineering toward novel material file
363 2022-11-10 16:00    Probing the Origin of Cosmic Infrared Background and Future Prospects with SPHEREx
362 2015-11-10 16:00    Rapid heating of matter using high power lasers
361 2015-12-01 16:00    Introducing extra dimensions to spectroscopic studies of advanced quantum materials
360 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence file
359 2023-04-13 11:00    [High Energy Theory Seminar]Noninvertible Gauss Law and Axions
358 2023-12-14 16:00    Superconducting qubits for large-scale quantum computers file
357 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
356 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
355 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
354 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
353 2022-06-10 11:00    Record-quality two-dimensional electron systems file
352 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
351 2017-05-12 13:30    Topological Dirac insulator
350 2025-07-03 14:00  Dr. Young-Gwan Choi (Max Planck Institute )  Quantum sensing with NV centers: nanoscale magnetometry file
349 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
348 2016-05-13 13:30    Aperiodic crystals in low dimensions
347 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file