Related Experiment Video
Updated: Mar 22, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.5K
Topological Effects on Quantum Phase Slips in Superfluid Spin Transport
Se Kwon Kim1, Yaroslav Tserkovnyak1
1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Physical Review Letters
|April 9, 2016
Summary
Quantum fluctuations decay spin supercurrent in antiferromagnetic chains. The rate differs for integer and half-odd-integer spins, verifiable via magnetoelectric circuits and magnetoresistance measurements.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Spintronics
Background:
- Superfluid spin transport is crucial for quantum technologies.
- Understanding quantum fluctuations' impact on spin transport in magnetic chains is essential.
- Easy-plane quantum antiferromagnetic spin chains exhibit unique magnetic properties.
Purpose of the Study:
- To theoretically investigate the effects of quantum fluctuations on superfluid spin transport.
- To analyze how quantum fluctuations, specifically phase slips, influence spin supercurrent decay.
- To differentiate the decay rates based on spin types (integer vs. half-odd-integer) in spin chains.
Main Methods:
- Theoretical investigation using the nonlinear sigma model for spin chains.
- Analysis of the topological term's role in spin supercurrent decay.
- Proposing an experimental setup using a magnetoelectric circuit.
Main Results:
- Quantum fluctuations cause spin supercurrent decay by unwinding the magnetic order parameter (phase slips).
- The topological term in the nonlinear sigma model distinguishes decay rates between integer and half-odd-integer spin chains.
- The proposed magnetoelectric circuit allows experimental verification of spin-dependent decay rates.
Conclusions:
- Quantum fluctuations significantly impact superfluid spin transport in easy-plane antiferromagnetic spin chains.
- The spin value (integer vs. half-odd-integer) qualitatively affects the spin supercurrent decay rate.
- Experimental validation of these theoretical findings is feasible using nonlocal magnetoresistance measurements in magnetoelectric circuits.
Related Concept Videos
01:03Atomic Nuclei: Nuclear Spin State Overview
2.2K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
2.2K
02:39Phase Transitions: Melting and Freezing
15.6K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.6K
01:08Spin–Spin Coupling Constant: Overview
1.6K
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...
1.6K
03:06The Pauli Exclusion Principle
61.0K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
61.0K
02:31Phase Transitions
23.6K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.6K
01:21Phase Transitions
43
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
43