Observations of two-fold shell filling and Kondo effect in a graphene nano-ribbon quantum dot device

A graphene nanoribbon (GNR) with orientation along its principle axis was obtained through a mechanical tearing process, and a quantum dot device was fabricated from the GNR. We have studied the transport property of the GNR quantum dot device down to dilution refrigerator temperatures. Two-fold cha...

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Bibliographic Details
Published in:arXiv.org 2009-10
Main Authors: Tan, C L, Tan, Z B, Wang, K, L Ma, Yang, F, Qu, F M, Chen, J, Yang, C L, L Lu
Format: Article
Language:English
Subjects:
Diamonds
Dilution
Electrons
Graphene
Kondo effect
Magnetic resonance
Periodic variations
Polarization (spin alignment)
Quantum dots
Resistance
Transport properties
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Summary:A graphene nanoribbon (GNR) with orientation along its principle axis was obtained through a mechanical tearing process, and a quantum dot device was fabricated from the GNR. We have studied the transport property of the GNR quantum dot device down to dilution refrigerator temperatures. Two-fold charging periodicity was observed in the Coulomb-blockade measurement, signaling a shell-filling process with broken valley degeneracy. In one of the smaller Coulomb diamonds, Kondo-like resonance were observed, with two conductance peaks displaced symmetrically from the zero bias voltage. The splitting of Kondo resonance at zero magnetic field suggests spin-polarization of the quantum dot, possibly due to the edge states of a zigzag GNR.
ISSN:2331-8422