Quantum Materials - 15

Abstract

Quantum entanglement among electrons has attracted much attention while direct measurements on the entanglement are not available. Instead, comparison between spectra of disentangled and entangled states has been used as a tractable approach to the entanglement [1,2]. However, other than several examples, spectroscopy spectra of entangled many-body electrons have been hardly accessible in numerical simulations.
To simulate these spectra and capture nature of the entanglement in quantum materials, such as cuprate superconductors, we have developed a flexible and efficient simulation code based on a dynamical variational method [3]. In Fig. 1, dynamical spin structure factors for the Hubbard Hamiltonian by our scheme are shown, which reproduce a continuum in 1D system [Fig.1(a)] and reveal fluctuations towards stripe phase in a doped 2D system [Fig.1(b)].