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26 April 2024 |
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Carbon nanotube peapods: observations of Kondo physics | | C. H. L. Quay
; John Cumings
; S. J. Gamble
; A. Yazdani
; R. de Picciotto
; H. Kataura
; D. Goldhaber-Gordon
; | | Date: |
12 Jun 2006 | | Abstract: | We measure the conductance of single carbon nanotube peapods at temperatures down to 250mK. Our devices show both metallic and semiconducting behavior at room temperature. At the lowest temperatures, we observe Coulomb Blockade and the spin-1/2 Kondo effect. Applying a magnetic field, we obtain 2.10 pm 0.02 for the g-factor, the most accurate measure to date of this quantity in a quantum dot. The Kondo peak splitting extrapolates to zero at B = 0 contrary to other recent reports and theoretical expectations. For even electron occupancy, we observe a spin-1 Kondo effect due to the degeneracy of the triplet ground states. Tuning gate voltage within the same Coulomb diamond drives a transition to a singlet ground state. We also independently tune the energy difference between singlet and triplet states with a magnetic field. The Zeeman splitting thus measured confirms the value of the g-factor measured from the spin-1/2 Kondo feature. | | Source: | arXiv, cond-mat/0606258 | | Services: | Forum | Review | PDF | Favorites | |
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