Mr. Eunice Paik Profile

Eunice Paik

at Univ of Michigan

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 8 March 2019 Presentation

Interlayer excitons in bilayer transitional metal dichalcogenide (Conference Presentation)

Long Zhang, Eunice Paik, Jason Horng, Rahul Gogna, Timothy Chou, Will Burg, Emanuel Tutuc, Hui Deng

Proceedings Volume 10920, 109200L (2019) https://doi.org/10.1117/12.2515458

KEYWORDS: Excitons, Metals, Semiconductors, Polarization, Crystals, Scattering, Electron holes, Picosecond phenomena, Quantum wells, Spatial coherence

Read Abstract +

Van der Waals semiconductors provide a platform for creating two-dimensional crystals layer-by-layer and engineering excitonic states therein with exceptional properties. We discuss here a few interesting opportunities enabled by interlayer excitons in bilayer transitional metal dichalcogenides (TMDs), including high valley polarizations, lasing in 2D cavities, and tunable interlayer excitons in homo-bilayers. Monolayer TMDs feature spin-valley locking, enabling valleytronic phenomena and applications. However, strong inter-valley scattering due to electron hole exchange interactions leads to rapid valley depolarization in picoseconds, making it difficult to achieve a high degree of valley polarization. The electron-hole exchange interaction becomes suppressed for interlayer excitons in heterobilayers with type II band alignment. We show highly polarized interlayer excitons with a long valley lifetimein in both spin singlet and brightened triplet states in hetero-bilayers. TMDs have also garnered intense interest as an active medium, for they feature very strong exciton-photon interactions in a monolayer. However, the rapid radiative decay makes it challenging to establish population inversion. Interlayer excitons decay much more slowly, comparable to excitons in quantum wells of conventional semiconductors. When the interlayer exciton are integrated on a cavity, lasing was established at the cavity resonance accompanied by increased temporal and spatial coherence. Lastly, due to the strong intra-layer localization of the carriers in 2D materials, interlayer excitons co-exist with intra-layer excitons as meta-stable states even in homo-bilayers without artificial interfaces. These interlayer excitons also feature oscillator strengths between intra-layer excitons and inter-layer ones in hetero-structures, offering a potentially highly tunable system for 2D optoelectronics.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years