1D flat bands in phosphorene nanoribbons with pentagonal nature

TL;DR

This paper demonstrates a method to create one-dimensional flat bands in phosphorene nanoribbons with pentagonal structures, verified experimentally and theoretically, providing a platform for exploring strongly interacting quantum phenomena.

Contribution

The study introduces a novel approach to realize 1D flat bands in phosphorene nanoribbons with pentagonal geometry, combining experimental verification with theoretical modeling.

Findings

Verification of 1D flat bands using angle-resolved photoemission spectroscopy

Identification of the flat bands originating from zigzag and Lieb lattice structures

Establishment of a general method to construct 1D flat bands in solid materials

Abstract

Materials with flat bands can serve as a promising platform to investigate strongly interacting phenomena. However, experimental realization of ideal flat bands is mostly limited to artificial lattices or moir\'e systems. Here we report a general way to construct one-dimensional (1D) flat bands in phosphorene nanoribbons (PNRs) with pentagonal nature: penta-hexa-PNRs and penta-dodeca-PNRs, wherein the corresponding 1D flat bands are directly verified by using angle-resolved photoemission spectroscopy. We confirm that the observed 1D flat bands originate from the electronic 1D zigzag and Lieb lattices, respectively, as revealed by the combination of bond-resolved scanning tunneling microscopy, scanning tunneling spectroscopy, tight-binding models, and first-principles calculations. Our study demonstrates a general way to construct 1D flat bands in 1D solid materials system, which provides a robust platform to explore strongly interacting phases of matter.