Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy

Details Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy

2008-09-04

arxiv.org/abs/0809.0834v2

Phys. Rev. B, Vol. 81, No. 12, 125323, 18 March, 2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages 7 figures

Scientific paper

10.1103/PhysRevB.81.125323

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.

Affiliated with

Also associated with

No associations

Rating

Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging and manipulating electrons in a 1D quantum dot with Coulomb blockade microscopy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-142071