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Related Concept Videos

Symmetry in Maxwell's Equations01:28

Symmetry in Maxwell's Equations

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Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
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Magnetic Fields01:27

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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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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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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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Electronic Structure of Atoms

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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Photonic Altermagnets: Magnetic Symmetries in Photonic Structures.

Andrew S Kim1,2,3, Youqiang Huang4, Zhipei Sun4

  • 1Research Institute of Basic Science, Seoul National University, Seoul 08826, Republic of Korea.

Nano Letters
|March 13, 2026
PubMed
Summary

Altermagnetism, a novel magnetic phase, is mimicked in photonic crystals, enabling control over light propagation. This breakthrough offers a new platform for photospintronic devices without spin-orbit interaction.

Keywords:
AltermagnetismChiralityKramers degeneracyPhotonic crystals

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Area of Science:

  • Condensed matter physics
  • Photonics
  • Spintronics

Background:

  • Altermagnetism combines ferromagnetism and antiferromagnetism properties.
  • It has potential applications in spintronics.
  • Transplanting altermagnetic properties to photonics could enable novel electromagnetic wave control.

Purpose of the Study:

  • To investigate the possibility of mimicking altermagnetism in photonic systems.
  • To explore the creation of altermagnetic spin-split bands in photonic crystals.
  • To develop a platform for optical control of polarized light.

Main Methods:

  • Engineering photonic crystals with chiroptic media.
  • Demonstrating spin space group symmetries within photonic crystals.
  • Analyzing the transport properties of engineered altermagnetic photonic systems.

Main Results:

  • Successfully mimicked altermagnetism in photonic crystals.
  • Created altermagnetic spin-split bands using engineered photonic crystals.
  • Achieved circularly polarized light isolation without spin-orbit interaction.

Conclusions:

  • Photonic crystals provide a versatile platform for studying altermagnetic properties.
  • This approach enables photospintronic applications and unconventional optical phenomena.
  • Engineered altermagnetic photonic crystals offer a new degree of freedom for light control.