Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures

• DOI: 10.1038/s41467-017-01748-1
• Publication Date: 2017-11-10T17:28:07Z
• Authors: Philipp Nagler; Mariana V. Ballottin; Anatolie A. Mitioglu; Fabian Mooshammer; Nicola Paradiso; Christoph Strunk; Rupert Huber; Alexey Chernikov; Peter C. M. Chris...; Christian Schüller; Tobias Korn
• Keywords: Valleytronics

Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics strongly coupled spin and valley degrees freedom for charge carriers. While the possibility exploiting these properties information processing stimulated concerted research activities towards concept valleytronics , maintaining control over spin-valley polarization proved challenging in individual monolayers. A promising alternative route explores type II band alignment artificial van der Waals heterostructures. The resulting formation interlayer excitons combines advantages long carrier lifetimes locking . Here, we demonstrate direct magnetic manipulation a WSe2/MoSe2 heterostructure through giant Zeeman splitting transitions. Remarkably, even after non-selective injection, observed $g$ factor as large $-15$ induces near-unity long-lived with 100 ns under fields. demonstrated highlights exceptional aspects novel, artificially designed material systems their promise atomically-thin valleytronic devices.