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
157 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
156 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
155 2015-12-11 13:30  E6-2, #1323  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
154 2021-07-29 14:00  Online seminar  Gravitationally Induced Dark Sector and Inflationary Dynamics file
153 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
152 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
151 2018-05-11 14:30  E6-2. 1st fl. #1323  Disordered Floquet topological insulators file
150 2023-09-14 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
149 2024-06-13 16:00  E6-2, #1323  Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
148 2023-07-18 11:00  E6-2, #1323  Non-Hermitian Casimir Effect of Magnons
147 2016-05-31 16:00  #1323(E6-2, 1st fl.)  Understanding 3D tokamak physics towards advanced control of toroidal plasma
146 2016-04-01 14:30  E6-2. 1st fl. #1501  Interference of single charged particles without a loop and dynamic nonlocality
145 2016-11-11 13:30  #1323(E6-2. 1st fl.)  Bandgap Engineering of Black Phosphorus
144 2021-06-11 16:00  Online seminar  Pseudogap in surface-doped black phosphorus file
143 2024-03-07 16:00  Zoom  [CAPP seminars] Development of Superconducting Transition Edge Sensors at SRON file
142 2018-11-29 16:00  #1323, E6-2  양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
141 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
140 2015-11-24 16:00  E6-2, #1323  Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
139 2016-07-08 14:00  #1323(E6-2. 1st fl.)  Electronic quasiparticles in the quantum dimer model
138 2016-10-18 15:00  E6-2. 1st fl. #1323  “Hybrid quantum systems with mechanical oscillators”