Carrier Dynamics in Ultrathin Gold Nanowires: Role of Auger Processes

Prakash, G and Kundu, S and Roy, A and Singh, AK and Ravishankar, N and Sood, AK (2020) Carrier Dynamics in Ultrathin Gold Nanowires: Role of Auger Processes. In: Plasmonics . (In Press)

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Abstract

Carrier dynamics in metallic nanostructures is strongly influenced by their confining dimensions. Gold nanoparticles of size �2 nm which fill the transition space separating metallic and non-metallic behavior. In this work, we report carrier dynamics in high aspect ratio ultrathin gold nanowires (Au-UNWs) of average diameter � 2 nm using pump (3.1 eV) and coherent white light continuum as probe in the spectral range of 1.15 to 2.75 eV. The transient carrier dynamics in Au-UNWs under extreme excitation regime is slower than predicted by the often used two-temperature model. We identify Auger-assisted carrier heating process which slows down the hot carrier cooling dynamics. The rate equation model fitted to the data yields an estimate of Auger coefficient for gold nanostructures.

Item Type:	Journal Article
Publication:	Plasmonics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Physical & Mathematical Sciences > Physics
Date Deposited:	24 Jun 2020 10:55
Last Modified:	24 Jun 2020 10:55
URI:	http://eprints.iisc.ac.in/id/eprint/64709

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