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Quantum tricriticality in a tunable quantum Rabi system

Published on:

20 February 2024

Primary Category:

Quantum Physics

Paper Authors:

You-Qi Lu,

Yu-Yu Zhang

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Key Details

Introduces a tricritical quantum Rabi model with a tunable atomic transition ratio

Derives first- and second-order superradiant phases using Landau theory

Finds a quantum tricritical point at the intersection of critical phase boundaries

Obtains distinct universal critical exponents at the quantum tricritical point

Demonstrates quantum tricriticality belongs to a nontrivial universality class

AI generated summary

Quantum tricriticality in a tunable quantum Rabi system

This paper explores a tricritical quantum Rabi model with a tunable parameter that controls the coupling ratio between a cavity and a three-level atom. At the quantum tricritical point where first- and second-order superradiant phase transitions intersect, unique universal critical exponents are found using finite-frequency scaling. This reveals quantum tricriticality goes beyond conventional phase transitions, providing an interesting generalization of the Rabi model to study higher-order critical phenomena.

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