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Related Experiment Video

Updated: Jul 4, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Single-particle tunneling in strongly driven double-well potentials.

E Kierig1, U Schnorrberger, A Schietinger

  • 1Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany. cdt@matterwave.de

Physical Review Letters
|June 4, 2008
PubMed
Summary

Scientists directly observed coherent control of single-particle tunneling in a driven double-well potential. This reveals the critical role of generalized parity symmetry in the destruction of tunneling effects.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Condensed matter physics

Background:

  • Quantum tunneling is a phenomenon where particles pass through potential barriers.
  • Controlling quantum phenomena like tunneling is crucial for quantum technologies.
  • Previous studies lacked direct observation of tunneling control in driven systems.

Purpose of the Study:

  • To directly observe and control single-particle tunneling in a driven double-well potential.
  • To investigate the role of driving parameters (frequency, amplitude, symmetry) in tunneling.
  • To validate theoretical predictions from Floquet theory and simplified models.

Main Methods:

  • Utilizing a periodic arrangement of double wells for atomic propagation.
  • Precisely controlling driving parameters: frequency, amplitude, and space-time symmetry.
  • Comparing experimental results with Floquet theory and a two-mode model.

Main Results:

  • First direct observation of coherent control of single-particle tunneling.
  • Experimental findings quantitatively match Floquet theory predictions.
  • Demonstrated critical dependence of tunneling destruction on generalized parity symmetry.

Conclusions:

  • Coherent control of quantum tunneling is achievable in driven double-well systems.
  • Generalized parity symmetry is a key factor in the coherent destruction of tunneling.
  • The study validates theoretical frameworks like Floquet theory for complex quantum dynamics.