visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2017-09-22 16:00 
연사  
장소 E6-2. 1st fl. #1323 

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

 

Abstract: 

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 연사 제목
공지 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
공지 2025-05-01 16:00  Dr. Inwook Kim (Lawrence Livermore National Laboratory)  BSM Physics Search with Quantum Sensors
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
533 2023-07-19 16:00    [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
532 2023-03-02 11:00    Probing Anomalies of Non-Invertible Symmetries with Symmetry TFTs
531 2020-07-02 16:00    An irreversible qubit-photon coupling for the detection of itinerant microwave photons file
530 2015-08-04 11:00    Propagation of ultrasound through two- and three-dimensional strongly scattering media
529 2016-07-07 14:00    Let there be topological superconductors
528 2017-09-22 13:00    Superconductor-metal-insulator transition in thin Tantalum films file
527 2017-06-02 14:30    Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
526 2016-05-24 16:00    Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density
525 2023-06-14 16:00    [CAPP seminar] EMC at CERN file
524 2023-06-15 16:00    [CAPP Seminar] Cryogenic electronics for ion traps file
523 2016-04-04 09:30    Radio frequency engineering
522 2016-11-1 10:30    Time scale dependent dynamics in InAs/InP quantum dot gain media
521 2018-10-25 16:00    Abelian and non-Abelian dark photons file
520 2024-08-14 11:00    Pair Density Waves and Supercurrent Diode Effect in Altermagnets
519 2017-09-22 14:30    Quantum Electronic Transport in Graphene Hybrid Nanostructures file
» 2017-09-22 16:00    Unexpected Electron-Pairing in Integer Quantum Hall Effect file
517 2024-05-14 16:00    [High Energy Theory Seminar] Minimal Production of Prompt Gravitational Waves during Reheating.
516 2018-12-07 14:30    Spin generation from heat and light in metals file
515 2015-09-14 14:00    Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
514 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model