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)
565 2025-05-26 16:00  윤석호 박사(삼성종합기술원)  Photonics in the Age of AI: Industry Trends and Perspectives file
564 2023-03-17 11:00    (응집물리 세미나)Operando electron microscopy investigation of domain dynamics in twisted van der Waals materials file
563 2025-05-22 16:00  유현승 박사(삼성종합기술원)  Reconstructing Reality: Learning-based Methods for 3D Imaging and Graphics file
562 2022-12-07 16:00    (광학분야 세미나) Non-Hermitian physics and non-Hermitian singularity
561 2022-05-02 16:00    What can we learn from the history of science and technology?(우리말강의)
560 2022-04-28 16:00    (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
559 2025-04-11 11:00  옥종목 교수 (부산대학교 물리학과)  An Approach to Controlling Physical Properties:Defect-Engineered High-Quality Single Crystal Growth file
558 2025-01-23 14:00  여영기 박사  Complete Polytype switching by super lubricant van der Waals cavity arrays file
557 2024-04-19 15:00    Engineering Physics for Semiconductor Equipment Innovation file
556 2009-02-23 16:00    Physics Colloquium : 2009 Spring file
555 2014-03-10 16:00    Physics Colloquium : 2014 Spring file
554 2022-04-14 16:00    (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
553 2022-11-11 11:00    [Update 세미나영상] (응집물리 세미나) Honeycomb oxide heterostructures for quantum spin liquid file
552 2022-03-07 16:00    Climate Physics and Modelling(우리말강의)
551 2022-08-01 10:00    [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
550 2022-10-27 16:00    (광학분야 세미나) Cavity optomechanical systems for quantum transduction
549 2011-05-16 16:00    Photonics with surface plasmon polaritons
548 2016-05-17 11:00    The CERN Resonant WISP Search: Development, Results and Lesson-Learned
547 2013-09-09 16:00    Physics Colloquium : 2013 Fall
546 2018-04-06 10:00    Entanglement and thermalization in many-body systems: recent progress file