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Related Concept Videos

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Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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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...
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Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Magnetic Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Manipulating solid-state spin concentration through charge transport.

Guoqing Wang1,2, Changhao Li1,2, Hao Tang3

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|August 1, 2023
PubMed
Summary
This summary is machine-generated.

Researchers controlled defect spin concentration in solid-state systems using charge transport. This method modulates spin density without increasing decoherence, enabling new studies in quantum sensing and many-body physics.

Keywords:
NV centerscharge dynamicscharge transportdouble electron–electron resonancespin defects

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Area of Science:

  • Quantum physics and materials science
  • Quantum sensing and simulation

Background:

  • Solid-state defects are crucial for quantum applications but their density is typically fixed.
  • Modulating defect density can reveal new properties but often increases decoherence.

Purpose of the Study:

  • To demonstrate a method for controlling spin concentration in solid-state defects via charge transport.
  • To characterize charge transport and its impact on defect spin states.
  • To enable tunable interaction strengths in hybrid charge-spin systems.

Main Methods:

  • Exploiting ionization and recombination cycles of nitrogen-vacancy (NV) centers in diamond.
  • Utilizing charge transport to modulate the charge state and thus spin concentration of defects.
  • Employing a wide-field imaging setup with a fast single photon detector array for spatial characterization.

Main Results:

  • Achieved a two-fold increase in dominant spin defect concentration.
  • Maintained relatively unchanged spin coherence times (T2) of NV centers.
  • Demonstrated micrometer-scale spatial resolution of charge redistribution.

Conclusions:

  • Charge transport offers a viable method to control spin concentration independently of decoherence.
  • This technique facilitates the study of many-body physics with tunable interaction strengths.
  • Opens new avenues for hybrid charge-spin systems in quantum technologies.