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)
494 2023-09-13 16:00    [High Energy Theory Seminar] Cosmic Birefringence from Dark Photon
493 2023-09-07 12:00    2023 가을학기 광학분야 및 응집물리 특별세미나 전체 일정 file
492 2023-08-29 16:00    [High Energy Theory Seminar] Towards string loop corrections in Calabi-Yau orientifold compactifications.
491 2023-08-24 12:00    2023 가을학기 콜로키움 전체 일정 file
490 2023-08-24 11:00    Advancing magnonic metamaterials: spin waves in nanomagnetic arrays
489 2023-08-23 16:00    [High Energy Theory Seminar] A spacetime tensor network for AdS3/CFT2
488 2023-07-26 10:00    [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio
487 2023-07-20 16:00    [CAPP Seminar] Cosmoparticle Physics of Dark Universe file
486 2023-07-19 16:00    [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
485 2023-07-18 11:00    Non-Hermitian Casimir Effect of Magnons
484 2023-07-14 11:00    Interfaces engineering of thin film oxides
483 2023-07-12 11:00    Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
482 2023-07-11 11:00    Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
481 2023-07-10 16:00    Electronic structures of magnetic and non-magnetic ordering in d- and f-electrons systems
480 2023-06-30 11:00    The Dual Mode Quantum Computer file
479 2023-06-26 11:00    Quantum computing on magnetic racetracks with flying domain wall qubits
478 2023-06-23 11:00    Visualizing orbital quantum phenomena at room temperature
477 2023-06-22 16:00    [CAPP Seminar] The muon g-2 puzzle file
476 2023-06-22 16:00    [High Energy Physics Seminar] The Branes Behind Generalized Symmetry Operators
475 2023-06-16 13:00    Quantum critical states under extreme conditions