Imaging and Manipulating Electrons in a 1D Quantum Dot with Coulomb Blockade Microscopy

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Imaging and Manipulating Electrons in a 1D Quantum Dot with Coulomb Blockade Microscopy

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Title: Imaging and Manipulating Electrons in a 1D Quantum Dot with Coulomb Blockade Microscopy
Author: Qian, Jiang; Halperin, Bertrand I.; Heller, Eric J.

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Citation: Qian, Jiang, Bertrand Halperin, and Eric Heller. 2010. Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy. Physical Review B 81(12): 125323.
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Abstract: Motivated by the recent experiments by the Westervelt group using a mobile tip to probe the electronic state of quantum dots formed on a segmented nanowire, we study the shifts in Coulomb blockade peak positions as a function of the spatial variation of the tip potential, which can be termed "Coulomb blockade microscopy". We show that if the tip can be brought sufficiently close to the nanowire, one can distinguish a high density electronic liquid state from a Wigner crystal state by microscopy with a weak tip potential. In the opposite limit of a strongly negative tip potential, the potential depletes the electronic density under it and divides the quantum wire into two partitions. There the tip can push individual electrons from one partition to the other, and the Coulomb blockade micrograph can clearly track such transitions. We show that this phenomenon can be used to qualitatively estimate the relative importance of the electron interaction compared to one particle potential and kinetic energies. Finally, we propose that a weak tip Coulomb blockade micrograph focusing on the transition between electron number N=0 and N=1 states may be used to experimentally map the one-particle potential landscape produced by impurities and inhomogeneities.
Published Version: doi:10.1103/PhysRevB.81.125323
Other Sources: http://arxiv.org/abs/0809.0834
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:7486326

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  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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