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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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Electron spin separation without magnetic field.

J Pawłowski1, P Szumniak, A Skubis

  • 1Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 9, 2014
PubMed
Summary
This summary is machine-generated.

This study proposes a novel nanodevice for electron spin separation in quantum dots. The device utilizes oscillating spin-orbit coupling to achieve spin separation in picoseconds, paving the way for spintronic applications.

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Area of Science:

  • Quantum Computing
  • Spintronics
  • Condensed Matter Physics

Background:

  • Electron spin manipulation is crucial for quantum computing and spintronics.
  • Current methods for spin separation in quantum dots face challenges in speed and control.
  • Semiconductor nanowires offer a promising platform for scalable quantum devices.

Purpose of the Study:

  • To propose a novel nanodevice for efficient electron spin separation.
  • To demonstrate electrical control over electron spin states in a quantum dot system.
  • To achieve rapid spin separation within picosecond timescales.

Main Methods:

  • Theoretical proposal of a nanodevice using a gated semiconductor nanowire.
  • Exploitation of transitions between singlet and triplet states.
  • Induction of transitions via resonantly oscillating Rashba spin-orbit coupling.
  • Numerical solution of the time-dependent Schroedinger equation for two electrons, including electron-electron correlations.

Main Results:

  • Successful theoretical demonstration of a nanodevice for separating electron spins.
  • Transformation of two electrons in a singlet state within one quantum dot to two electrons in opposite spins in separate quantum dots.
  • Achieved electron spin separation within tens of picoseconds.
  • All-electrical control mechanism for the spin separation process.

Conclusions:

  • The proposed nanodevice offers a viable and fast method for electron spin separation.
  • This advancement has significant implications for the development of scalable quantum computers and spintronic devices.
  • The electrical control mechanism simplifies device operation and integration.