Ultrafast carrier dynamics in semiconductor superlattices: terahertz gain and dephasing mechanism

Norihiko Sekine; Yozo Shimada; Kazuhiko Hirakawa

doi:10.1117/12.607517

13 April 2005 Ultrafast carrier dynamics in semiconductor superlattices: terahertz gain and dephasing mechanism (Invited Paper)

Norihiko Sekine, Yozo Shimada, Kazuhiko Hirakawa

Author Affiliations +

Proceedings Volume 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX; (2005) https://doi.org/10.1117/12.607517
Event: Integrated Optoelectronic Devices 2005, 2005, San Jose, California, United States

Abstract

We have directly determined the spectral shape of the complex conductivities of Bloch oscillating electrons by using time-domain terahertz (THz)-electrooptic sampling technique and presented an experimental evidence for a dispersive Bloch gain in superlattices. This unique dispersive gain without population inversion arises from a non-classical nature of Bloch oscillations; that is, the phase of the Bloch oscillation (BO) is shifted by π/2 from that of the semi-classical charged harmonic oscillation when driven by the same ac field. By increasing the bias electric field, the gain bandwidth reached ~3 THz in our particular sample. It was also found that the dominant dephasing mechanism of the BOs is identified to be the interface roughness scattering (alloy disorder scattering) below (above) the critical bias electric field.

Citation Download Citation

Norihiko Sekine, Yozo Shimada, and Kazuhiko Hirakawa "Ultrafast carrier dynamics in semiconductor superlattices: terahertz gain and dephasing mechanism (Invited Paper)", Proc. SPIE 5725, Ultrafast Phenomena in Semiconductors and Nanostructure Materials IX, (13 April 2005); https://doi.org/10.1117/12.607517

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