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Spin-Layer Locking Effects in Optical Orientation of Exciton Spin in Bilayer WSe2
- Publication Year :
- 2013
- Publisher :
- arXiv, 2013.
-
Abstract
- Coupling degrees of freedom of distinct nature plays a critical role in numerous physical phenomena. The recent emergence of layered materials provides a laboratory for studying the interplay between internal quantum degrees of freedom of electrons. Here, we report experimental signatures of new coupling phenomena connecting real spin with layer pseudospins in bilayer WSe2. In polarization-resolved photoluminescence measurements, we observe large spin orientation of neutral and charged excitons generated by both circularly and linearly polarized light, with a splitting of the trion spectrum into a doublet at large vertical electrical field. These observations can be explained by locking of spin and layer pseudospin in a given valley. Because up and down spin states are localized in opposite layers, spin relaxation is substantially suppressed, while the doublet emerges as a manifestation of electrically induced spin splitting resulting from the interlayer bias. The observed distinctive behavior of the trion doublet under circularly and linearly polarized light excitation further provides spectroscopic evidence of interlayer and intralayer trion species, a promising step toward optical manipulation in van der Waals heterostructures through the control of interlayer excitons.<br />Comment: Original submitted version. To appear in Nature Physics
- Subjects :
- Physics
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics
Spin states
Condensed matter physics
Spintronics
Exciton
Bilayer
Degrees of freedom
General Physics and Astronomy
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter::Materials Science
Monolayer
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Condensed Matter::Strongly Correlated Electrons
Trion
Spin-½
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....65e4f01141b481a3253f1f572e7e3532
- Full Text :
- https://doi.org/10.48550/arxiv.1311.7087