Related Experiment Video
Updated: Dec 20, 2025
09:00
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
10.3K
Microwave Spectroscopy Reveals the Quantum Geometric Tensor of Topological Josephson Matter
R L Klees1, G Rastelli1,2, J C Cuevas3
1Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany.
Physical Review Letters
|May 30, 2020
Summary
Topological Josephson matter allows experimental access to the quantum geometric tensor of Andreev states. Synthetically polarized microwaves reveal topological quantum properties via absorption rates.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Topological matter
Background:
- Topological invariants like Chern numbers are crucial in quantum systems.
- The quantum geometric tensor offers local quantum state information but is experimentally challenging to access.
- Multiterminal Josephson junctions are emerging as controllable platforms for synthesizing topological systems.
Purpose of the Study:
- To theoretically investigate Andreev states in topological Josephson matter.
- To demonstrate a method for experimentally extracting the quantum geometric tensor of these states.
- To link observable quantities to topological quantum properties.
Main Methods:
- Theoretical study of Andreev states in topological Josephson junctions.
- Utilizing synthetically polarized microwaves for state manipulation and measurement.
- Analyzing absorption rates and oscillator strength to probe quantum geometric properties.
Main Results:
- The quantum geometric tensor of Andreev states in topological Josephson matter can be experimentally extracted.
- Synthetically polarized microwaves enable this extraction.
- Oscillator strength of absorption rates directly indicates topological quantum properties.
Conclusions:
- Topological Josephson matter provides a viable platform for probing advanced quantum phenomena.
- The proposed microwave-based method offers a new experimental pathway to characterize topological states.
- This work bridges theoretical concepts with experimental accessibility in quantum matter.
Related Concept Videos
01:30Electromagnetic Waves in Matter
3.8K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore,...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore,...
3.8K
01:08NMR Spectroscopy: Spin–Spin Coupling
2.8K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
2.8K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
2.5K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.5K
01:17Theory of Metallic Conduction
1.7K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.7K
01:12Interaction of EM Radiation with Matter: Spectroscopy
2.9K
Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
2.9K
02:59The Atomic Theory of Matter
125.6K
The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
125.6K