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Phase transitions in frustrated quantum magnets

Published on:

13 March 2024

Primary Category:

Strongly Correlated Electrons

Paper Authors:

Andreas Rückriegel,

Dmytro Tarasevych,

Peter Kopietz

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Key Details

Uses spin functional RG incorporating spin constraints to study frustrated magnet ground states

Finds good agreement with expensive methods for the extent of the spin 1/2 paramagnetic region

Quantum paramagnetic phase disappears above spin 5 due to vanishing quantum fluctuations

AI generated summary

Phase transitions in frustrated quantum magnets

This paper studies the ground state phase diagram of the quantum Heisenberg model on a square lattice, with both nearest and next-nearest neighbor interactions. Using the spin functional renormalization group method, incorporating constraints from spin length and dynamics, they compute the extent of the quantum paramagnetic phase appearing at strong frustration. They find it agrees well with other costly methods for spin 1/2, and disappears above spin 5 due to vanishing quantum fluctuations.

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