Emergence of Topological Fermi Liquid from a Strongly Correlated Bosonic System in Optical Superlattices

TL;DR

This paper demonstrates that a bosonic t-J model in optical superlattices can give rise to a topological Fermi liquid with Fermi surfaces, offering insights into high-temperature superconductivity.

Contribution

It reveals the emergence of a topological Fermi liquid from a bosonic system, providing a new perspective on strongly correlated electronic phenomena.

Findings

Emergence of a topological Fermi liquid with Fermi surfaces from a bosonic system

Potential observation of these phenomena in ultracold atom experiments

Insights into the origins of high-temperature superconductivity

Abstract

Recent experiments on quantum degenerate gases give an opportunity for simulating strongly-correlated electronic systems in optical lattices. It may shed light on some long-standing puzzles in condensed-matter physics, like the nature of high-temperature superconductivity in cuprates that had baffled people over two decades. It is believed that the two-dimensional fermionic Hubbard model, or t-J model, contains the key to this problem; but the difficulty of unveiling the mystery of a strongly-interacting fermionic system is also generally acknowledged. Here, as a substitute, we systematically analyze the property of bosonic t-J model simulated in optical superlattices near unit-filling. In particular, we show the emergence of a strange topological Fermi liquid with Fermi surfaces from a purely bosonic system. We also discuss the possibility of observing these phenomena in ultracold atom experiments. The result may provide some crucial insights into the origin of high-T_{c} superconductivity.