Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Organic Photovoltaics and Electronics II (joint session CPP/DS/HL, organized by HL)

CPP 39.7: Vortrag

Mittwoch, 22. März 2017, 16:45–17:00, POT 81

Intereference-induced thermoelectric effects in topological states of matter — •Flavio Ronetti1,2, Luca Vannucci1,2, Giacomo Dolcetto3, Matteo Carrega4, and Maura Sassetti1,21Dipartimento di Fisica, Università di Genova,Via Dodecaneso 33, 16146, Genova, Italy. — 2CNR-SPIN, Via Dodecaneso 33, 16146, Genova, Italy. — 3Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg. — 4NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa, Italy.

In topological states of matter, such as edge states of quantum Hall systems and two-dimensional topological insulators, protection from backscattering guarantees phase-coherent ballistic transport, allowing for the observation of quantum interference effects. Intriguing thermoelectric properties can be achieved by exploiting the phase-coherent edge states of two quantum Hall systems coupled by tunnelling region. Considering a multiple quantum point contacts geometry, interference paths effectively break the electron-hole symmetry. Therefore, when the systems are driven out of equilibrium by a thermal gradient, a thermoelectric charge current can be induced. Correspondingly, an interference pattern in the heat current is predicted. In the case of two-dimensional topological insulators, the presence of spin degree of freedom give rise to a rich tunnelling dynamics. In a double quantum point contact geometry, the effective transmission related to spin-flipping processes acquires a functional dependence on energy in the interacting regime, thus generating a thermoelectric spin current in response to a thermal gradient.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden