Quasiparticles with adjustable interactions

Water waves are local excitations in water that behave like particles in many respects, have velocity and energy, and interact with each other. In a material, certain excitations can behave like particles and have all sorts of adjustable properties. It is a quasiparticle.Credit: PIXTA / CC0 public domain

The laws of quantum mechanics allow the existence of “quasiparticles”. This is the excitation of a material that behaves exactly like a normal particle. The main advantage of quasiparticles over regular particles is the ability to manipulate their Nature Materials In this week’s News and View article, IoP physicist Erik van Heumen describes a recent experiment in which even interactions between quasiparticles can be adjusted.

In recent years, the mathematical field of topology, which studies the shape of objects, and the physical field of condensed matter physics, which studies the behavior of solids and fluids, have been integrated into an exciting new field of research, the field of topology materials. One of the most exciting aspects of this complex is the emergence of exotic quasiparticles. A local disturbance of the material that behaves exactly like a particle. The existence of such quasiparticles was already known from the quantum description of simple materials. The combination with topology offers a whole new set of particles, known as Dirac and Weil fermions, axions, and magnetic monopoles, for example.

Engineering interaction

Freed from the strict rules for ordinary particles determined by nature, researchers can control the properties of quasiparticles by carefully selecting the materials used to produce the quasiparticles. One wish at the top of the list was to find a material that could adjust the type and intensity of interactions between quasiparticles.

Recently, a family of materials featuring atoms arranged in the so-called Kagome lattice has been discovered. In his “News & Views” article, Erik van Heumen describes the experiments reported in the latest edition. Nature MaterialsExcitations, which suggest the formation of so-called “flux density waves” in these materials, provide the first confirmation of the theoretical prediction that these materials may host quasiparticles that interact exotically. The fact that such tunable interactions between quasiparticles in a material can be created in the laboratory holds great promise for future research in topological materials.

Emergent magnetic monopole isolated using quantum annealing computer

For more information:
Chiral charge density Kagome lattice, Nature Materials (2021). DOI: 10.1038 / s41563-021-01095-z

Courtesy of the University of Amsterdam

Quote: Quasiparticles with adjustable interactions (September 24, 2021) from https: // September 24, 2021 Was acquired by.

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Quasiparticles with adjustable interactions

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