Two-Stage Kondo Effect and Kondo Box Level Spectroscopy in a Carbon Nanotube

Details Two-Stage Kondo Effect and Kondo Box Level Spectroscopy in a Carbon Nanotube Two-Stage Kondo Effect and Kondo Box Level Spectroscopy in a Carbon Nanotube

2010-10-07

arxiv.org/abs/1010.1551v1

Phys. Rev. B 82, 161411(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.82.161411

The concept of the "Kondo box" describes a single spin, antiferromagnetically coupled to a quantum dot with a finite level spacing. Here, a Kondo box is formed in a carbon nanotube interacting with a localized electron. We investigate the spins of its first few eigenstates and compare them to a recent theory. In an 'open' Kondo-box, strongly coupled to the leads, we observe a non-monotonic temperature dependence of the nanotube conductance, which results from a competition between the Kondo-box singlet and the 'conventional' Kondo state that couples the nanotube to the leads.

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