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Related Concept Videos

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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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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Electrically tunable quantum interference of atomic spins on surfaces.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Condensed Matter Physics

Background:

  • Quantum interference control is vital for quantum information processing.
  • Achieving tunable quantum interference in engineered atomic structures is difficult.

Purpose of the Study:

  • To demonstrate electrical control of quantum interference using atomic spins.
  • To explore Landau-Zener-Stückelberg-Majorana (LZSM) interferometry in atomic systems.

Main Methods:

  • Utilized a scanning tunneling microscope with bias voltages for electrical control.
  • Modulated magnetic interactions between a probe tip and surface atoms.
  • Applied strong electric fields to drive spin states through energy-level anticrossings.

Main Results:

  • Achieved all-electrical LZSM interferometry on single and coupled atomic spins.
  • Observed multiphoton resonances and asymmetric LZSM patterns indicating spin-transfer torque influence.
  • Measured distinct interference patterns for coupled spins based on their energy landscapes.

Conclusions:

  • Demonstrated a novel method for all-electrical quantum manipulation.
  • Opened new possibilities for spin-based quantum processors operating in a strongly driven regime.
  • Highlighted the role of electric fields and spin-transfer torque in controlling quantum dynamics.