Detailed experimental and theoretical studies of lateral electron transport in a system of quantum dot chains demonstrate the complicated character of the conductance within the chain structure due to the interaction of conduction channels with different dimensionalities. The one-dimensional character of states in the wetting layer results in an anisotropic mobility, while the presence of the zero-dimensional states of the quantum dots leads to enhanced hopping conductance, which affects the low-temperature mobility and demonstrates an anisotropy in the conductance. These phenomena were probed by considering a one-dimensional model of hopping along with band filling effects. Differences between the model and the experimental results indicate that this system does not obey the simple one-dimensional Mott's law of hopping and deserves further experimental and theoretical considerations.
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14 May 2013
Research Article|
May 10 2013
Electron transport in quantum dot chains: Dimensionality effects and hopping conductance
Vas. P. Kunets;
Vas. P. Kunets
a)
1
Institute for Nanoscience and Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
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M. Rebello Sousa Dias;
M. Rebello Sousa Dias
2
Departamento de Física, Universidade Federal de São Carlos
, 13565-905 São Carlos, SP, Brazil
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T. Rembert;
T. Rembert
1
Institute for Nanoscience and Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
3
Department of Electrical Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
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M. E. Ware;
M. E. Ware
1
Institute for Nanoscience and Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
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Yu. I. Mazur;
Yu. I. Mazur
1
Institute for Nanoscience and Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
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V. Lopez-Richard;
V. Lopez-Richard
a)
2
Departamento de Física, Universidade Federal de São Carlos
, 13565-905 São Carlos, SP, Brazil
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H. A. Mantooth;
H. A. Mantooth
3
Department of Electrical Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
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G. E. Marques;
G. E. Marques
2
Departamento de Física, Universidade Federal de São Carlos
, 13565-905 São Carlos, SP, Brazil
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G. J. Salamo
G. J. Salamo
1
Institute for Nanoscience and Engineering, University of Arkansas
, Fayetteville, Arkansas
72701, USA
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a)
Authors to whom correspondence should be addressed. Electronic addresses: vkunets@uark.edu and vlopez@df.ufscar.br.
J. Appl. Phys. 113, 183709 (2013)
Article history
Received:
January 30 2013
Accepted:
April 24 2013
Citation
Vas. P. Kunets, M. Rebello Sousa Dias, T. Rembert, M. E. Ware, Yu. I. Mazur, V. Lopez-Richard, H. A. Mantooth, G. E. Marques, G. J. Salamo; Electron transport in quantum dot chains: Dimensionality effects and hopping conductance. J. Appl. Phys. 14 May 2013; 113 (18): 183709. https://doi.org/10.1063/1.4804324
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