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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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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Extreme harmonic generation in electrically driven spin resonance.

J Stehlik1, M D Schroer1, M Z Maialle2

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters
|June 21, 2014
PubMed
Summary
This summary is machine-generated.

We observed multiple harmonic generation in electric dipole spin resonance within InAs nanowire double quantum dots. This phenomenon, dependent on detuning, suggests Landau-Zener dynamics at energy level anticrossings.

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Area of Science:

  • Quantum dots
  • Spintronics
  • Nanowire physics

Background:

  • Electric dipole spin resonance (EDSR) is a key technique for manipulating electron spins.
  • Double quantum dots in nanowires offer a platform for studying spin dynamics.

Purpose of the Study:

  • To investigate multiple harmonic generation in EDSR within an InAs nanowire double quantum dot.
  • To understand the detuning dependence of these harmonics and their underlying physical mechanisms.

Main Methods:

  • Experimental observation of multiple harmonic generation.
  • Measurement of harmonic signal as a function of detuning in the double quantum dot.

Main Results:

  • Multiple harmonic generation was observed in EDSR.
  • As many as eight harmonics were detected near the interdot charge transition.
  • Harmonics diminished to the fundamental spin resonance at large detunings.

Conclusions:

  • The detuning dependence of the observed harmonics suggests a connection to Landau-Zener transition dynamics.
  • Anticrossings in the energy level spectrum are implicated as the origin of these dynamics.