Time-resolved spectroscopy of coupled spin-valley-dynamics in monolayer transition metal dichalcogenides at low temperatures

Gerd Plechinger; Philipp Nagler; Christian Schüller; Tobias Korn

doi:10.1117/12.2186402

8 September 2015 Time-resolved spectroscopy of coupled spin-valley-dynamics in monolayer transition metal dichalcogenides at low temperatures

Gerd Plechinger, Philipp Nagler, Christian Schüller, Tobias Korn

Author Affiliations +

Proceedings Volume 9551, Spintronics VIII; 95510V (2015) https://doi.org/10.1117/12.2186402
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

We demonstrate the exfoliation of large-area monolayer flakes prepared from bulk MoS₂ crystals. The flakes are first characterized using Raman and photoluminescence measurements. We then utilize time-resolved Kerr rotation (TRKR) measurements to probe the valley dynamics in the monolayer flakes at low temperatures. This technique allows resonant excitation of the excitonic transitions and yields sub-picosecond resolution. We find valley lifetimes of about 40 ps at a temperature of 4 K in monolayer MoS₂ for resonant excitation. With increasing temperatures, we observe a dramatic decrease of the valley lifetimes, indicating that valley dephasing is mediated by phonon-related scattering processes.

Conference Presentation

Citation Download Citation

Gerd Plechinger, Philipp Nagler, Christian Schüller, and Tobias Korn "Time-resolved spectroscopy of coupled spin-valley-dynamics in monolayer transition metal dichalcogenides at low temperatures", Proc. SPIE 9551, Spintronics VIII, 95510V (8 September 2015); https://doi.org/10.1117/12.2186402

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available