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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Updated: Jun 17, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Tunable Kondo effect in a single donor atom.

G P Lansbergen1, G C Tettamanzi, J Verduijn

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. g.p.lansbergen@tudelft.nl

Nano Letters
|January 1, 2010
PubMed
Summary
This summary is machine-generated.

Researchers observed the Kondo effect in a single atom using a gate-tunable silicon device. This allows electrical control over the exotic valley Kondo effect and its ground state symmetry.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • The Kondo effect is a phenomenon in quantum physics where magnetic impurities in a metal interact with conduction electrons.
  • Previous studies have focused on spin-based Kondo effects, with limited control over the ground state symmetry.

Purpose of the Study:

  • To observe and control a novel valley Kondo effect in a single atom.
  • To demonstrate electrical tunability of the Kondo ground state symmetry.

Main Methods:

  • Fabrication of a silicon nanostructure with a single Arsenic (As) dopant atom.
  • Utilizing a gate electric field to tune the atomic orbitals of the dopant.
  • Measuring the electrical properties to identify the Kondo effect.

Main Results:

  • Observed a new valley Kondo effect arising from the interaction between the dopant's atomic orbitals and silicon valleys.
  • Demonstrated that the gate electric field can tune the system into a (nearly) degenerate superposition of two silicon valleys.
  • Showcased reversible electrical control over the Kondo ground state symmetry, transitioning between SU(2) and SU(4) configurations.

Conclusions:

  • The single-atom device enables the study of exotic quantum phenomena like the valley Kondo effect.
  • Electrical control over valley degrees of freedom opens new avenues for quantum information processing and spintronics.
  • This work provides a platform for exploring novel quantum states and their manipulation at the nanoscale.