Charge and spin gaps of the ionic Hubbard model with density-dependent hopping
arxiv(2023)
Abstract
We calculate the charge gap Δ E_C and the spin gap Δ E_S of the
ionic Hubbard chain including electron-hole symmetric density-dependent
hopping. The vanishing of Δ E_C (Δ E_S) signals a quantum
critical point (QCP) in the charge (spin) sector. Between both critical points,
the system is a fully gapped spontaneously dimerized insulator (SDI). We focus
our study in this region. Including alternation in the hopping, it is possible
to perform an adiabatic Thouless pump of one charge per cycle, but with a
velocity limited by the size of the gaps.
MoreTranslated text
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined