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Updated: May 29, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Rationally independent free fermions with local hopping
Jonathon Riddell1, Bruno Bertini1
1University of Nottingham, University of Nottingham, University of Birmingham, School of Physics and Astronomy, Edgbaston, Birmingham B15 2TT, United Kingdom; School of Physics and Astronomy, Nottingham NG7 2RD, United Kingdom; and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, Nottingham NG7 2RD, United Kingdom.
Abstract:
Rationally independent free fermions are those where sums of single-particle energies multiplied by arbitrary rational coefficients vanish only if the coefficients are all zero. This property guaranties that they have no degeneracies in the many-body spectrum and gives them relaxation properties more similar to those of generic systems. Using classic results from number theory we provide minimal examples of rationally independent free fermion models for every system size in one dimension. This is accomplished by considering a free fermion model with a chemical potential, and hopping terms corresponding to all the divisors of the number of sites, each one with an incommensurate complex amplitude. We then move on to discuss the many-body spectral statistics for these models. Indeed, because of their nondegenerate spectrum, these systems are potentially compatible with Poissonian spectral statistics, as opposed to most noninteracting systems. We show that local probes-like the ratio of consecutive level spacings-look very similar to what is expected for the Poisson statistics. We however demonstrate that free fermion models can never have Poisson statistics with an analysis of the moments of the spectral form factor.
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