Related Experiment Video
Updated: Aug 20, 2025
09:00
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
10.0K
Predicting Phonon-Induced Spin Decoherence from First Principles: Colossal Spin Renormalization in Condensed Matter
Jinsoo Park1, Jin-Jian Zhou2, Yao Luo1
1Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, California 91125, USA.
Physical Review Letters
|November 18, 2022
Summary
Electron spin decoherence, limited by atomic vibrations (phonons), is crucial for quantum technologies. Our unified calculations accurately predict spin relaxation and precession, advancing semiconductor spintronics.
Area of Science:
- Quantum physics
- Materials science
- Condensed matter theory
Background:
- Electron spin decoherence from atomic vibrations (phonons) limits quantum device performance.
- Existing models for phonon-induced spin decoherence (Elliott-Yafet, Dyakonov-Perel) have distinct treatments.
- A unified understanding is needed to accurately predict spin dynamics in semiconductors.
Purpose of the Study:
- To develop a unified theoretical framework for modeling phonon-induced electron spin decoherence.
- To enable accurate predictions of spin relaxation and precession in semiconductor materials.
- To advance the development of spin-based quantum technologies.
Main Methods:
- Computation of the phonon-dressed vertex of the spin-spin correlation function.
- Application of a theoretical approach analogous to the calculation of anomalous magnetic moments in Quantum Electrodynamics (QED).
- Unification of the Elliott-Yafet and Dyakonov-Perel decoherence mechanisms.
Main Results:
- The unified model accurately predicts spin relaxation and precession in semiconductors.
- A giant renormalization of electron spin dynamics in solids was found, significantly exceeding photon-induced corrections in vacuum.
- The phonon-dressed vertex correction plays a critical role in electron spin dynamics.
Conclusions:
- A general and quantitative approach for analyzing spin decoherence in materials has been demonstrated.
- This work advances the fundamental understanding of electron spin decoherence in solids.
- The findings are crucial for the advancement of spin-based quantum technologies.
Related Concept Videos
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
01:08Spin–Spin Coupling Constant: Overview
985
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...
985
01:03Atomic Nuclei: Nuclear Spin State Overview
1.1K
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...
1.1K
01:23Atomic Nuclei: Nuclear Relaxation Processes
701
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
701
01:08NMR Spectroscopy: Spin–Spin Coupling
1.5K
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...
1.5K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
1.1K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.1K