Orbital and Charge-Resolved Polaron States in CdSe Dots and Rods Probed by Scanning Tunneling Spectroscopy

Zhixiang Sun (孙志祥), Ingmar Swart, Christophe Delerue, Daniël Vanmaekelbergh, and Peter Liljeroth
Phys. Rev. Lett. 102, 196401 – Published 12 May 2009

Abstract

Conduction electrons interact with lattice vibrations, leading to coupled electron-phonon states. This effect is of fundamental importance in understanding electron transport and energy relaxation in nanoscale systems. We report quantitative results on the electron-phonon coupling strength in CdSe quantum dots (QDs) and rods, obtained by low-temperature scanning tunneling microscopy. We resolve the polaron eigenstates arising from coupling of the electrons to longitudinal optical phonons. The electron-phonon coupling strength is dependent on the electron orbital symmetry, the number of added electrons, and the size and dielectric environment of the QD.

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  • Received 4 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.196401

©2009 American Physical Society

Authors & Affiliations

Zhixiang Sun (孙志祥)1, Ingmar Swart1,2, Christophe Delerue3, Daniël Vanmaekelbergh1, and Peter Liljeroth1,*

  • 1Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, University of Utrecht, PO Box 80000, 3508 TA Utrecht, The Netherlands
  • 2Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, University of Utrecht, Sorbonnelaan 16, 3584 CA Utrecht, The Netherlands
  • 3Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), Département ISEN, 41 bd Vauban, 59046 Lille Cedex, France

  • *P.Liljeroth@uu.nl

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Vol. 102, Iss. 19 — 15 May 2009

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