Quasiparticles & collective excitations as a research area investigates emergent, effective degrees of freedom in many-body systems, where interactions among underlying microscopic constituents give rise to particle-like or mode-like entities such as phonons, magnons, polarons, excitons, and plasmons. This field focuses on formulating and analyzing low-energy effective theories, dispersion relations, lifetimes, and interaction vertices of these excitations using frameworks such as many-body perturbation theory, Green’s functions, field-theoretic methods, and numerical many-body techniques. It plays a central role in understanding transport, superconductivity, topological phases, and nonequilibrium dynamics in condensed matter, ultracold atomic systems, and related quantum materials.
Metal nanostructures can concentrate light so strongly that they can trigger chemical reactions. The key players in this process are plasmons—collective oscillations of free electrons in the metal that confine energy to extremely ...
Nanophysics
Dec 15, 2025
0
50
For much of my career, I have been fascinated by the ways in which materials behave when we reduce their dimensions to the nanoscale. Over and over, I've learned that when we shrink a material down to just a few nanometers ...
A researcher at the Department of Physics at Tohoku University has uncovered a surprising quantum phenomenon hidden inside ordinary crystals: the strength of interactions between electrons and lattice vibrations—known as ...
Condensed Matter
Dec 9, 2025
0
199
In collaboration with scientists in Germany, EPFL researchers have demonstrated that the spiral geometry of tiny, twisted magnetic tubes can be leveraged to transmit data based on quasiparticles called magnons, rather than ...
Nanophysics
Dec 9, 2025
0
30
Acoustic frequency filters, which convert electrical signals into miniaturized sound waves, separate the different frequency bands for mobile communications, Wi-Fi, and GPS in smartphones. Physicists at RPTU have now shown ...
Condensed Matter
Nov 28, 2025
0
215
In recent years, organic semiconductor materials have attracted considerable attention as key components for next-generation photoenergy conversion devices and organic solar cells due to their light weight and mechanical ...
Nanomaterials
Nov 18, 2025
0
27
Phonons are sound particles or quantized vibrations of atoms in solid materials. The Debye model, a theory introduced by physicist Peter Debye in 1912, describes the contribution of phonons to the specific heat of materials ...
A research team at the City University of New York and the University of Texas at Austin has discovered a way to make previously hidden states of light, known as dark excitons, shine brightly, and control their emission at ...
Nanophysics
Nov 12, 2025
0
57
Physicists at the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) in Hamburg have discovered a striking new form of quantum behavior. In star-shaped Kagome crystals—named after a traditional Japanese ...
Condensed Matter
Oct 30, 2025
1
178
Researchers have for the first time created a reconfigurable polariton 2D quasicrystal. The team from the Skolkovo Institute of Science and Technology (Skoltech), in collaboration with colleagues from the University of Iceland, ...
Optics & Photonics
Oct 23, 2025
0
176
