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Quantum wake dynamics in Heisenberg antiferromagnetic chains.
A Scheie1, P Laurell2,3, B Lake4,5
1Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA. scheie@lanl.gov.
Nature Communications
|October 2, 2022
Summary
Researchers observed a novel quantum magnetic state in an antiferromagnetic chain using neutron scattering. This "quantum wake" exhibits unique oscillations and reveals the system's quantum properties.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Quantum Many-Body Physics
Background:
- Traditional spectroscopy analyzes physical systems in momentum and frequency domains.
- Key quantum many-body effects arise from local, short-time correlations.
- Observing these local correlations is challenging with conventional methods.
Purpose of the Study:
- To experimentally observe and theoretically describe a local, coherent magnetic state.
- To investigate quantum many-body effects emerging from local quantum quenches.
- To develop a model-agnostic measure of a magnetic system's quantumness.
Main Methods:
- Inelastic neutron scattering experiments.
- Theoretical analysis using methods of integrability.
- Inducing a local quantum quench in a Heisenberg antiferromagnetic chain.
Main Results:
- Observation of a local, coherent, long-lived, quasiperiodically oscillating magnetic state, termed a "quantum wake".
- The quantum wake emerges from propagating excitations following a local quantum quench.
- Demonstration that the technique reveals non-commutativity of spin operators.
Conclusions:
- The observed "quantum wake" exhibits properties similar to Floquet states, discrete time crystals, and nonlinear Luttinger liquids.
- This experimental approach provides a new method for probing local quantum correlations.
- The technique serves as a model-agnostic measure of a magnetic system's quantum nature.
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