visual
visual

세미나

  • 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

 

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 장소 제목
497 2016-07-08 11:00  #1323(E6-2. 1st fl.)  Isostatic magnetism
496 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus
495 2016-07-07 14:00  #1323(E6-2. 1st fl.)  Let there be topological superconductors
494 2017-02-01 14:00  #1323(E6-2. 1st fl.)  Quantum electron optics using flying electrons
493 2016-11-16 16:00  #1323(E6-2. 1st fl.)  Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
492 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
491 2018-05-31 16:00  #1323, E6-2  Dynamic control of optical properties with gated-graphene metamaterials file
490 2018-10-04 16:00  #1323, E6-2  Engineering light absorption in an ultrathin semiconductor metafilm file
489 2019-12-05 16:00  #1323, E6-2  Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell file
488 2019-10-15 16:00  #1323, E6-2  Moiré superlattices and graphene quasicrystal file
487 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
486 2019-11-05 16:00  #1323, E6-2  Study on nanomaterials by the development of ultrahigh resolution laser-photoelectron microscopy (PEEM) file
485 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
484 2019-12-18 16:00  #1323, E6-2  Road to Higher Tc Superconductivity file
483 2018-05-09 16:00  #1323, E6-2  Recent advances in thermoelectric bulk composites file
482 2018-11-21 15:00  #1323, E6-2  Engineering topological quantum physics at the atomic scale file
481 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
480 2019-10-25 15:00  #1323, E6-2  Physics Seminar file
479 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
478 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file