Quantum Electronic Transport in Graphene Hybrid Nanostructures
2017.09.21 08:15
장소 | E6-2. 1st fl. #1323 |
---|---|
일시 | Sep. 22 (Fri.), 02:30 PM |
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.
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
186 | 2015/12/11, 3:45PM | E6-2, #1323 | Dr. Ji Hun Sim (POSTECH) | Dynamical mean field theory studies on heavy fermion system |
185 | 2015/12/02, 4PM | E6-2, #1323 | Dr. Dae-Jeong Kim (Dept. of Physics and Astronomy, University of California, Irvine) | Samarium Hexaboride: Is it a Topological insulator? |
184 | 2015/12/01, 4PM | E6-2, #1323 | Dr. Yeong Kwan Kim(Lawrence Berkeley National Laboratory, USA) | Introducing extra dimensions to spectroscopic studies of advanced quantum materials |
183 | July 31(Wed.)/ 16:00 | E6-2, #1323 | Dr. Ivan Borzenets |
Features of ballistic superconducting graphene
![]() |
182 | 2015/12/09, 2PM | E6-2, #1323 | Arjun G. Yodh (University of Pennsylvania) | SWELLABLE COLLOIDAL PARTICLES ARE SWELL |
181 | Jun 24 (Mon) 11:00 | E6-2, #1323 | Dr. Henning Schomerus |
Topological photonic anomalies
![]() |
180 | July 25(Thur.),4:00PM | E6-2, #1323 | Prof.Bohm-Jung Yang |
Band topology of twisted bilayer graphene
![]() |
179 | 2016/1/26, 2PM | E6-2, #1323 | Dr. Sergei V. Kalinin (Center for Nanophase Materials Sciences, Oak Ridge National Laboratory) | Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data |
178 | 2015/08/03,10:30AM | E6-2, #1323 (Seminar Room) | Dr. Jonghee Yoo (Fermi National Accelerator Laboratory, USA ) | Axion Search |
177 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
![]() |
176 | 2015/11/06, 4:30 PM | E6-2, #5318 | Dr. Youngkuk Kim (University of Pennsylvania) | Topological Dirac line nodes in centrosymmetric semimetals |
175 | 2015/10/23, 3PM | E6-2, #5318 | Dr. Helmut Soltner (Forschungszentrum Juelich) | Development of a Rogowski Coil as a new beam position monitor |
174 | 2015/07/16, 4PM | E6-2, 1318 | Dr. Kyunghan Hong(MIT) | Next-generation ultrafast laser technology for nonlinear optics and strong-field physics |
173 | 2015/07/16-07/17 | E6-2, 1501 | Sang-Wook Cheong (Rutgers Univ.) | KAIST Physics Distinguished Lecture |
172 | 2016/03/11-06/09 | E6-2, 1501 외 | 박권(KAIS) 외 |
Physics Seminar Serises : 2016 Spring
![]() |
171 | Jul 3rd, 2019 (Wed) | E6-2, 2501 | Kyung Soo Choi |
Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics"
![]() |
170 | June 14 (THU), 10:00 AM | E6-2, 2nd fl. #2502 | Prof. Kenji Toyoda |
Phonons and polariton-like particles in trapped ions for quantum computation and quantum simulation
![]() |
169 | 2015/10/16, 3PM | E6-2, 5th fl. #5318 | Dr. Pierre Pugnat , (CNRS-LNCMI) | High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble |
168 | 2015/10/15, 10AM | E6-2, 5th fl. #5318 | Dr. Mark D. Bird (Florida State University) | Development of Large-Bore, High Field Magnets at the NHMFL |
167 | Dec. 15 (Fri.), 9:20 AM | E6-2, Lecture Room #1323 | Prof. Jhinhwan Lee 외 9명 |
Workshop on Magnetism in Unconventional Superconductors 개최
![]() |