Variation of co-tunneling and Kondo effects by control of the strength of coupling between a vertical dot and a two-dimensional electron gas

K. Yamada, M. Stopa, T. Hatano, T. Ota, T. Yamaguchi, S. Tarucha

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have fabricated a vertical quantum dot with lateral coupling, modulated by a split gate voltage, to a two-dimensional electron. We thereby control not only electron configurations but also the strength of coupling between the dot and the lateral lead, by applying gate voltages. We have measured the conductance enhancement when the applied bias exceeds the single-electron excitation energy, in the Coulomb blockade regime. This conductance enhancement disappears as the split gate voltage decreases (reducing the coupling). This indicates that this enhancement is caused by inelastic co-tunneling. Furthermore, we observed a conductance enhancement at zero source-drain bias with stronger coupling. An anomaly is observed that we attribute to Kondo resonance between the dot and the leads.

Original languageEnglish
Pages (from-to)185-189
Number of pages5
JournalSuperlattices and Microstructures
Volume34
Issue number3-6
DOIs
Publication statusPublished - Sep 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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