EPJ Web Conf.
Volume 230, 2020Italian National Conference on the Physics of Matter (FisMat 2019)
|Number of page(s)||9|
|Published online||11 March 2020|
Spectral features of voltage pulses in interacting helical channels
1 Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, I-16146, Genova, Italy
2 CNR-SPIN, Via Dodecaneso 33, I-16146, Genova, Italy
3 Aix-Marseille Univ, Université de Toulon, CNRS, CPT, Marseille, France
4 Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074, Würzburg, Germany
5 NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127, Pisa, Italy
∗ Corresponding author: firstname.lastname@example.org
Published online: 11 March 2020
We investigate the interplay of voltage-driven excitations and electron-electron interactions in a pair of counterpropagating helical channels capacitively coupled to a time-dependent gate. By focusing on the non-equilibrium spectral properties of the system, we show how the spectral function is modified by external drives with different time profile in presence of Coulomb interactions. In particular, we focus on a Lorentzian drive and a square single pulse. In presence of strong enough electron-electron interactions, we find that both drives can result in minimal excitations, i.e. characterized by an excess spectral function with a definite sign. This is in contrast with what happens in the non-interacting case, where only properly quantized Lorentzian pulses are able to produce minimal excitations.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.