Real-time observation of the intravalley spin-flip process in single-layer WS2

Zilong Wang; Alejandro Molina-Sanchez; Patrick Altmann; Davide Sangalli; Domenico De Fazio; Giancarlo Soavi; Ugo Sassi; Federico Bottegoni; Franco Ciccacci; Marco Finazzi; Ludger Wirtz; Andrea Ferrari; Andrea Marini; Giulio Cerullo; Stefano Dal Conte

doi:10.1051/epjconf/201920505012

Proceedings

Open Access

EPJ Web of Conferences 205, 05012 (2019)
https://doi.org/10.1051/epjconf/201920505012

Real-time observation of the intravalley spin-flip process in single-layer WS₂

Zilong Wang¹, Alejandro Molina-Sanchez², Patrick Altmann¹, Davide Sangalli³, Domenico De Fazio⁴, Giancarlo Soavi⁴, Ugo Sassi⁴, Federico Bottegoni¹, Franco Ciccacci¹, Marco Finazzi¹, Ludger Wirtz⁵, Andrea Ferrari⁴, Andrea Marini³, Giulio Cerullo¹^,6 and Stefano Dal Conte^1*

¹ Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy
² Institute of Materials Science (ICMUV), University of Valencia, Catedràtico Beltràn 2, E-46980, Valencia, Spain
³ Istituto di Struttura della Materia (ISM), CNR, Via Salaria Km 29.3, I-00016 Monterotondo Stazione, Italy
⁴ Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom
⁵ Université du Luxembourg, 162 A, avenue de la Faiencerie, L-1511 Luxembourg
⁶ IFN-CNR, Piazza L. da Vinci 32, I-20133 Milano, Italy

Published online: 16 April 2019

Abstract

We use helicity-resolved transient absorption spectroscopy to track intravalley scattering dynamics in monolayer WS₂. We find that spin-polarized carriers scatter from upper to lower conduction band by reversing their spin orientation on a sub-ps timescale.

© The Authors, published by EDP Sciences, 2019

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.