One-dimensional superlattices with s-p resonance

TL;DR

This paper introduces a one-dimensional optical superlattice with s-p orbital resonance to realize an extended Bose-Hubbard model, providing precise tunneling parameters and analyzing topological properties like Zak-Berry phase.

Contribution

It presents a method to accurately compute tunneling coefficients in a superlattice with s-p resonance, revealing the system's splitting into two disconnected lattices and analyzing its topological features.

Findings

Accurate calculation of tunneling coefficients using maximally-localized Wannier functions.

Identification of system splitting into two disconnected lattices at s-p resonance.

Analysis of Zak-Berry phase and single-particle spectrum in the model.

Abstract

We propose a realization of an extended Bose-Hubbard model, which takes into account next-nearest-neighbor tunneling, by one-dimensional double-well optical superlattice with a resonance between s and p orbitals in the neighboring sites. Custom method of finding maximally-localized Wannier functions enables us to compute physical tunneling coefficients, which put some restrictions on the studies of the model, what have recently been done using arbitrary values of parameters. Furthermore, it turns out that out of s-p resonance the system splits up into two disconnected lattices. We analyze also Zak-Berry phase and single-particle spectrum of the system. In order to present the problem in the full context, short review of rudiments of optical lattice physics and derivation of the standard Bose-Hubbard model is included.