Abstract
We study the superfluid-insulator quantum phase transition of interacting bosons by means of large-scale Monte Carlo simulations in the presence of both topological and generic quenched disorders. Recent work has demonstrated that the amplitude mode at this transition broadens and localizes in the presence of dilution disorder, whereas it remains a well-defined delocalized excitation for topological (connectivity) disorder. Here, we analyze the crossover between systems with purely topological disorder and systems with additional bond randomness to disentangle the roles that disorder and interactions play for amplitude mode localization. Specifically, we analyze the scalar susceptibility and its spectral density on both sides of the quantum phase transition. We also discuss the implications of our results for the potential observation of amplitude mode localization in experiments.
Recommended Citation
P. K. Vishnu et al., "Amplitude Mode at the Superfluid-insulator Transition on a Random Lattice," European Physical Journal Special Topics, EDP Sciences; Springer; Società Italiana di Fisica, Jan 2025.
The definitive version is available at https://doi.org/10.1140/epjs/s11734-025-01929-w
Department(s)
Physics
Publication Status
Open Access
International Standard Serial Number (ISSN)
1951-6401; 1951-6355
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 EDP Sciences; Springer; Società Italiana di Fisica, All rights reserved.
Publication Date
01 Jan 2025
Comments
Institute of International Education, Grant DMR-1828489