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 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
453 2023-04-06 16:00    (광학분야 세미나)Nanophotonics-based approaches to explore Berry physics
452 2023-04-05 16:00    [High Energy Theory Seminar]Anomalies of Discrete 1-Form Symmetries in QCD-like Theories
451 2023-04-04 16:00    Chiral Magnetism: A Geometric Perspective
450 2023-03-30 16:00    Detecting axions with chiral magnetic effects file
449 2023-03-30 16:00    (광학분야 세미나)Scalable quantum entanglement in trapped-ions based quantum computer
448 2023-03-27 15:00    A coherent mechanical oscillator pumped by a suspended quantum dot file
447 2023-03-24 11:00    (응집물리 세미나)Floquet simulators of topological surface states in isolation
446 2023-03-22 16:00    (High Energy Theory Seminar) Boltzmann or Bogoliubov? A Case of Gravitational Particle Production
445 2023-03-17 11:00    (응집물리 세미나)Operando electron microscopy investigation of domain dynamics in twisted van der Waals materials file
444 2023-03-16 16:00    (광학분야 세미나) Investigation of 3D cell mechanics using refractive-index tomography
443 2023-03-16 16:00    2023 봄학기 광학분야 및 응집물리 특별세미나 전체 일정 file
442 2023-03-02 11:00    Probing Anomalies of Non-Invertible Symmetries with Symmetry TFTs
441 2023-02-28 11:00    Topotactic redox engineering toward novel material file
440 2023-02-27 12:00    2023 봄학기 콜로키움 전체 일정 file
439 2023-02-20 17:00    (Optics Seminar) Neural Holography for Next generation Virtual and Augmented Reality Displays file
438 2023-02-20 16:00    Physics of ferromagnet/superconductor junctions
437 2023-01-12 16:00    Spin wavepackets in the Kagome ferromagnet Fe3Sn2: propagation and precursors
436 2023-01-12 14:40    JILA 1D Wannier-Stark optical lattice clock file
435 2023-01-11 16:00    Non-abelian anyons and graph gauge theory on a superconducting processor, Eun-Ah Kim (Cornell University/Ewha Womans University)
434 2023-01-11 11:00    Directly proving magnetoelastic coupling in a soft ferromagnet using Lorentz 4D-STEM file