Related Experiment Video
Updated: Apr 27, 2026
09:25
Fabricating van der Waals Heterostructures with Precise Rotational Alignment
Published on: July 5, 2019
8.9K
Synthetic Crystal Rotation with Spacetime Metamaterials
Iñigo Liberal1, Alejandro Manjavacas2
1Public University of Navarre, Department of Electrical, Electronic and Communications Engineering, Institute of Smart Cities, 31006 Pamplona, Spain.
Physical Review Letters
|April 25, 2026
Summary
Synthetic crystal rotations enable studying light-matter interactions at high frequencies. This research explores how these rotations alter light properties, leading to novel phenomena like frequency-SAM locking.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Electromagnetism
Background:
- Traditional light-matter interactions are limited by low rotation frequencies.
- Exploring high-frequency rotation effects is crucial for advanced optical applications.
Purpose of the Study:
- Investigate light scattering by synthetic crystal rotations.
- Understand the impact of spatiotemporal modulations on light-matter interactions.
- Explore novel light-matter interaction regimes.
Main Methods:
- Simulated synthetic crystal rotations using spatiotemporal modulations.
- Analyzed the scattering of optical pulses by these synthetic structures.
- Examined frequency-domain responses and spin angular momentum (SAM) changes.
Main Results:
- Spatiotemporal modulations mimic high-frequency crystal rotations.
- Observed conservation of combined energy and spin angular momentum (SAM).
- Demonstrated intrapulse SAM changes and frequency-SAM locking in scattered light.
- Identified negative frequency sideband transitions at high rotation frequencies.
Conclusions:
- Synthetic rotations provide access to new light-matter interaction regimes.
- Spatiotemporal modulations fundamentally alter electromagnetic field symmetries.
- The findings pave the way for novel optical phenomena and technologies.
Related Concept Videos
02:58Crystal Field Theory - Octahedral Complexes
28.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.4K
02:18X-ray Crystallography
21.5K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
21.5K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
47.5K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
47.5K
01:08Spin–Spin Coupling Constant: Overview
1.2K
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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.2K
01:24The Seven Crystal Systems: Overview
285
Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
285
01:29Determination of Crystal Structures
135
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
135