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Spatial Separation of Molecular Conformers and Clusters

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Published on: January 9, 2014

Constraint-Induced Delocalization.

Piotr Sierant^1,2, Eduardo Gonzalez Lazo^1,3, Marcello Dalmonte^1,3

¹The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy.

Physical Review Letters

|October 1, 2021

Summary

This summary is machine-generated.

We investigated how quenched disorder affects quantum spin chains with local constraints. Our findings show that competing disorder effects prevent many-body localization, even under strong disorder conditions.

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Area of Science:

Quantum physics
Condensed matter physics
Disordered quantum systems

Background:

Quantum spin chains are fundamental models in condensed matter physics.
Rydberg atoms provide a controllable platform for realizing 1D quantum systems.
Quenched disorder introduces randomness, potentially leading to novel quantum phenomena like many-body localization.

Purpose of the Study:

To investigate the impact of quenched disorder on the dynamics of locally constrained quantum spin chains.
To determine if many-body localization occurs in these constrained systems under disorder.
To elucidate the competing mechanisms through which disorder affects system dynamics.

Main Methods:

Large-scale numerical simulations of 1D quantum spin chains.
Analysis of both frozen (Ising-type) and dressed (XY-type) regimes.
Detailed examination of quenched disorder terms in constrained systems.

Main Results:

No evidence of many-body localization was observed, even with significant disorder.
Quenched disorder terms act as both on-site disorder and interactions between excitations.
These competing effects prevent the system from reaching the strong disorder, weak interaction regime required for many-body localization.

Conclusions:

A competing mechanism involving disorder and interaction prevents many-body localization in constrained quantum spin chains.
This understanding can be extended to other constrained models and quenched gauge theories.
The interplay between disorder and constraints offers a new perspective on quantum dynamics.