Edge structure in the fractional quantum hole conjugate states

Location: 
Mann Student Center See map
10 Hillhouse
New Haven, CT 06511

Special Solid State & Optics Seminar Series

sponsored by “The Flint Fund Series on Quantum Devices and Nanostructures”

Tuesday, February 5th, 2019

2:15pm

Mann Student Center

Dr. Fabien Lafont

College the France, Paris

Edge structure in the fractional quantum hole conjugate states

Controlling the transmission of electrical current using a quantum point contact (QPC) constriction paves the way to a large variety of experiments in mesoscopic physics. Using two closely spaced QPCs, I will show that it is possible to unveil the internal edge state structure of the nu=2/3 and nu=3.5 states. Furthermore, the increasing interest in heat transfer in such systems fosters questions about possible manipulations of quantum heat modes that do not carry net charge (neutral modes). 

Here, I will present the transmission of upstream neutral modes through a quantum point contact in fractional hole-conjugate quantum Hall states. Employing two different measurement techniques, we were able to render the relative spatial distribution of these chargeless modes with their charged counterparts. In these states, which were found to harbor more than one downstream charge mode, the upstream neutral modes are found to flow with the inner charge mode - as theoretically predicted. Finally I will show that in its spin-unpolarized flavor, the nu=2/3 state presents a charge current flowing against the chirality over distances of several microns. 

Prof. Robert Schoelkopf

Applied Physics

Yale University

Event time: 
Tuesday, February 5, 2019 - 2:15pm
Sponsor: 
The Flint Fund Series on Quantum Devices and Nanostructures”
Presented By: 
Dr. Fabien Lafont
Department: 
College the France, Paris
Hosted By: 
Prof. Robert Schoelkopf