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Atomic Nuclei: Nuclear Magnetic Moment00:59

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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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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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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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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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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Magnetic Skyrmionic Polarons.

Luis Brey1

  • 1Instituto de Ciencia de Materiales de Madrid, CSIC , 28049 Cantoblanco, Spain.

Nano Letters
|October 31, 2017
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new quasiparticle, the magnetic skyrmionic polaron, in 2D electron systems with strong spin-orbit coupling. This particle exhibits unique electrical, topological, and spin properties, including a Hall effect in electric fields.

Keywords:
Magnetic skyrmionsmagnetic semiconductorspolarons

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Materials Science

Background:

  • Two-dimensional electron gases (2DEGs) are fundamental systems for exploring exotic electronic states.
  • Rashba spin-orbit coupling (SOC) plays a crucial role in spintronic phenomena.
  • Self-induced magnetic textures like skyrmions offer pathways to novel quasiparticles.

Purpose of the Study:

  • To investigate the formation and properties of a novel quasiparticle arising from the coupling of a 2DEG with magnetic ions.
  • To characterize the magnetic skyrmionic polaron under varying physical parameters.
  • To explore the dynamics and emergent phenomena, such as the Hall effect, of this quasiparticle.

Main Methods:

  • Theoretical study of a 2D electron gas coupled to classical magnetic ions.
  • Analysis of the self-trapping of an electron into a skyrmion spin texture.
  • Application of the collective coordinate approximation to study quasiparticle dynamics.
  • Investigation across a range of parameters including temperature, exchange coupling, Rashba coupling, and magnetic field.

Main Results:

  • A new quasiparticle, termed the magnetic skyrmionic polaron, is identified.
  • This polaron possesses electrical charge, topological charge, and significant spin.
  • The magnetic skyrmionic polaron exhibits a Hall effect in the presence of an electric field due to skyrmion chirality.
  • The stability of the magnetic skyrmionic polaron is confirmed across various parameter ranges.

Conclusions:

  • The magnetic skyrmionic polaron represents a novel emergent state in 2D electron systems with strong Rashba SOC.
  • Its unique properties, including the electrically induced Hall effect, suggest potential applications in spintronics.
  • Materials like GeMnTe are proposed as potential hosts for observing magnetic skyrmionic polarons.