Kinetic quantum phase transition in bosonic superfluids on a lattice

TL;DR

This paper identifies a new type of quantum phase transition in dilute bosonic superfluids on a lattice, driven by kinetic energy dispersion, contrasting with the well-known superfluid-Mott insulator transition caused by interactions.

Contribution

It reveals a kinetic energy-driven quantum phase transition in dilute bosonic superfluids, expanding understanding of superfluid states beyond interaction-driven transitions.

Findings

Discovered a kinetic energy-driven quantum phase transition.

Characterized transition from homogeneous to inhomogeneous Bose-condensate.

Provided insights into the superfluid state in lattice systems.

Abstract

It has been well known that quantum fluctuations induce a macroscopic phase transition from a superfluid to a Mott insulator phase driven by the repulsive potential energy in the ground state of dense bosonic systems on a lattice. We find a quantum phase transition from the homogeneous to an inhomogeneous Bose-condensate strongly affected or sometimes driven by the kinetic energy dispersion in dilute bosonic superfluids, which provides a clear identification of the superfluid state.