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Related Experiment Videos

Coherent electron transport in a Si quantum dot dimer.

L P Rokhinson1, L J Guo, S Y Chou

  • 1Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA.

Physical Review Letters
|May 15, 2002
PubMed
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Charge transfer coherence in double quantum dots is analyzed using conductance patterns, not requiring long phase coherence lengths. This study demonstrates coherent transport in a silicon nanostructure dominated by inelastic cotunneling.

Area of Science:

  • Quantum Physics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Understanding charge transport in nanostructures is crucial for quantum computing and electronics.
  • Quantum dots offer tunable electronic properties for studying quantum phenomena.
  • Coherent charge transfer is a key factor in efficient quantum device operation.

Purpose of the Study:

  • To determine the coherence of charge transfer in a weakly coupled double-dot system.
  • To investigate if phase coherence length in the host material is essential for measuring charge transfer coherence.
  • To experimentally study charge transport in a silicon nanostructure with two quantum dots.

Main Methods:

  • Analysis of conductance pattern statistics to assess charge transfer coherence.

Related Experiment Videos

  • Experimental investigation of charge transport through a silicon nanostructure containing two quantum dots.
  • Characterization of transport through a double-dot dimer with varying coupling strengths.

    • Main Results:

    • Coherence of charge transfer through the double-dot dimer was successfully determined from conductance pattern statistics.
    • The study confirmed coherent transport through the double-dot dimer.
    • Inelastic cotunneling processes were found to dominate the overall transport, with one dot strongly coupled to the leads.

    Conclusions:

    • Charge transfer coherence in weakly coupled double dots can be measured without a large phase coherence length in the host material.
    • The experimental system demonstrates coherent transport despite being dominated by inelastic cotunneling.
    • This work provides a method for characterizing coherence in quantum dot systems.