Electron Dynamics in Quantum Dots on Helium Surface

Details Electron Dynamics in Quantum Dots on Helium Surface Electron Dynamics in Quantum Dots on Helium Surface

2003-08-27

arxiv.org/abs/cond-mat/0308572v1

Physics

Condensed Matter

Presented at Electronic Properties of Two-Dimensional Systems-15

Scientific paper

10.1016/j.physe.2003.12.117

We study single-electron quantum dots on helium surface created by electrodes submerged into the helium. The intradot potential is electrostatically controlled. We find the electron energy spectrum and identify relaxation mechanisms. Strong in-plane confinement significantly slows down electron relaxation. Energy relaxation is due primarily to coupling to phonons in helium. Dephasing is determined by thermally excited ripplons and by noise from underlying electrodes. The decay rate can be further suppressed by a magnetic field normal to the helium surface. Slow relaxation in combination with control over the energy spectrum make localized electrons appealing as potential qubits of a quantum computer.

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