• HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-09-22 16:00 
일시 Sep. 22 (Fri.), 04:00 PM 
장소 E6-2. 1st fl. #1323 
연사 Dr. GilHo Lee / Department of Physics, POSTECH 

Unexpected Electron-Pairing in Integer Quantum Hall Effect

 Dr. HyungKook Choi / Department of Physics, Chonbuk National University

 Sep. 22 (Fri.), 04:00 PM

E6-2. 1st fl. #1323



Electronic interferometry has played a significant role in investigating some of the most fundamental and subtle issues of quantum physics, such as decoherence, entanglement and complementarity etc. Recently, we report on a novel phenomenon observed in an electronic Fabry-Perot Interferometer (eFPI) operating in the integer quantum Hall effect (IQHE) [1, 2], which revealed that the period of the Aharonov–Bohm (AB) oscillations drops by a half at bulk filling >2.5, accompanied by an interfering charge  e*=2e. Although charge e is observed when the visibility is low, the single-particle interference is invariably fully dephased. Counterintuitively, the halved interference periodicity is determined by the area enclosed by the second-inner edge channel, separating the v = 1 and v = 2 regions, and not by the area within the outermost interfering channel. Such pairing is not observed in a Mach–Zehnder interferometer (MZI). A combination of an MZI and an FPI elucidates the role of the second-inner edge mode, as well as the formation of paired–electrons quasiparticles. The results suggest that a neutral chiral edge mode plays a crucial role in the pairing phenomenon. In this talk, I will briefly review the basics of electronic interferometry in the quantum Hall regime and then discuss about unexpected electron pairing.


[1] H. K. Choi et al., Nat. Commun. 6, 7435 (2015).

[2] I. Sivan et al., submitted to PRB

번호 날짜 장소 제목
216 2020-10-16 14:30  Nanoscale magnetic resonance detection towards nano MRI file
215 2020-10-16 16:00  Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
214 2020-10-23 14:00  E6-2 #1323  Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
213 2020-11-12 16:00  E6-2 1323  2020 가을학기 광학분야 특별세미나
212 2020-11-17 12:00  Online(Zoom)  Quantum- & Nano-Photonics" 세미나 시리즈 file
211 2020-11-20 14:30  Online  Lumpy Cooper pairs in an iron-based superconductor
210 2020-11-20 16:00  Online  Coherent control of field gradient induced quantum dot spin qubits
209 2020-11-26 16:00  Online(Zoom)  2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
208 2020-12-02 10:00  Zoom  Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
207 2020-12-09 10:00  Zoom  Searching for the QCD axion with the ARIADNE experiment file
206 2020-12-10 13:55  Zoom  Consistency of Boltzmann equation and light dark matter from inflaton decay
205 2020-12-11 14:30  online  Antisymmetric interlayer exchange coupling in magnetic multilayers
204 2020-12-11 16:00  online  Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials
203 2020-12-23 10:00  Online  Online workshop for Quantitative Phase Imaging file
202 2021-01-28 15:00  Zoom  Topological Transport of Deconfined Hedgehogs in Magnets file
201 2021-01-28 18:00  Online Seminar  Quantum metamaterials: concept, theory, prototypes and possible applications file
200 2021-02-02 14:30  Zoom  Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems) file
199 2021-02-15 17:00  Zoom  Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file
198 2021-02-17 09:00  Online  석학 대중 강연 및 강의 시리즈 file
197 2021-03-02 16:00  Online  Sensitive terahertz detection with graphene-based transistors file