August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【165】Broken-Symmetry Ground States of the Heisenberg model on the Pyrochlore Lattice

Sep 3, 2021, 12:15 PM
Room C

Room C

Talk Condensed Matter Physics (KOND) Condensed Matter Physics


Nikita Astrakhantsev (University of Zurich)


The spin-1/2 Heisenberg model on the pyrochlore lattice is debated to possess a spin-liquid ground state. We contest this hypothesis with a numerical investigation using exact diagonalization and variational techniques: RVB-like Monte Carlo ansatz and convolutional neural network for (variational) calculations up to $4×4^3$ spins. We determine the phase transition between the putative spin-liquid phase and the neighboring ordered phase and characterize the ground state in terms of symmetry-breaking. We find indications of spontaneously broken inversion and rotational symmetry, calling the scenario of a featureless quantum spin-liquid into question. This showcases how variational techniques allow to make progress in answering challenging questions about 3D frustrated magnets.

Primary authors

Prof. Carleo Giuseppe (EPFL) Mark Fischer (University of Zurich) Nikita Astrakhantsev (University of Zurich) Mr Chen Ao (ETH Zurich) Kenny Choo (University of Zurich) Titus Neupert (University of Zurich) Dr Tiwari Apoorv (UZH) Mr Tom Westerhout (Radboud University)

Presentation materials

There are no materials yet.