Nagler, Philipp and Ballottin, Mariana V. and Mitioglu, Anatolie A. and Mooshammer, Fabian and Paradiso, Nicola and Strunk, Christoph and Huber, Rupert and Chernikov, Alexey and Christianen, Peter C. M. and Schuller, Christian and Korn, Tobias (2017) Giant magnetic splitting inducing near-unity valley polarization in van der Waals heterostructures. NATURE COMMUNICATIONS, 8: 1551. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)Abstract
Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. While the possibility of exploiting these properties for information processing stimulated concerted research activities towards the concept of valleytronics, maintaining control over spin-valley polarization proved challenging in individual monolayers. A promising alternative route explores type II band alignment in artificial van der Waals heterostructures. The resulting formation of interlayer excitons combines the advantages of long carrier lifetimes and spin-valley locking. Here, we demonstrate artificial design of a two-dimensional heterostructure enabling intervalley transitions that are not accessible in monolayer systems. The resulting giant effective g factor of -15 for interlayer excitons induces near-unity valley polarization via valley-selective energetic splitting in high magnetic fields, even after nonselective excitation. Our results highlight the potential to deterministically engineer novel valley properties in van der Waals heterostructures using crystallographic alignment.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ATOMICALLY THIN SEMICONDUCTOR; MONOLAYER WSE2; INTERLAYER EXCITONS; MOS2; GENERATION; EMITTERS; FIELDS; LAYER; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:19 |
| Last Modified: | 25 Feb 2019 14:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1842 |
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