Shaping charge excitations in chiral edge states with a time-dependent gate voltage
Artikel i vetenskaplig tidskrift, 2018

We study a coherent conductor supporting a single edge channel in which alternating current pulses are created by local time-dependent gating and sent on a beam-splitter realized by a quantum point contact. The current response to the gate voltage in this setup is intrinsically linear. Based on a fully self-consistent treatment employing a Floquet scattering theory, we analyze the effect of different voltage shapes and frequencies, as well as the role of the gate geometry on the injected signal. In particular, we highlight the impact of frequency-dependent screening on the process of shaping the current signal. The feasibility of creating true single-particle excitations with this method is confirmed by investigating the suppression of excess noise, which is otherwise created by additional electron-hole pair excitations in the current signal.

Författare

Maciej Misiorny

Uniwersytet im. Adama Mickiewicza w Poznaniu

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Gwendal Feve

Université Paris Diderot

Janine Splettstoesser

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Physical Review B - Condensed Matter and Materials Physics

0163-1829 (ISSN)

Vol. 97 7 1-18 075426

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.97.075426