Related papers: Isolated flat bands in an interlocking-circles lattice

Isolated flat bands in an interlocking-circles lattice

URL: http://arxiv.org/abs/2108.07137v1
Date: Mon, 16 Aug 2021 15:13:54 GMT
Title: Isolated flat bands in an interlocking-circles lattice
Authors: Siwen Li, Yuee Xie, and Yuanping Chen
Abstract summary: We propose a new lattice that can produce isolated flat bands. The lattice is named as interlocking-circles lattice because its pattern seems like interlocking circles. Our work not only proposes a new type of lattice but also opens a way to find systems with isolated flat bands.
Score: 0.6117371161379208
License: http://creativecommons.org/publicdomain/zero/1.0/
Abstract: Flat-band physics has attracted much attention in recently years because of its interesting properties and important applications. Some typical lattices have been proposed to generate flat bands, such as Kagome and Lieb lattices. The flat bands in these lattices contact with other bands rather than isolated. However, an ideal flat band should be isolated, because isolation is a prerequisite for a number of important applications. Here, we propose a new lattice that can produce isolated flat bands. The lattice is named as interlocking-circles lattice because its pattern seems like interlocking circles. Moreover, the new lattice is realized in graphene by hydrogenation. In the hydrogenated graphene, there are two nontrivial isolated flat bands appearing around the Fermi level. Upon hole or electron doping, the flat bands split into spin-polarized bands and then result in a ferromagnetic graphene. Our work not only proposes a new type of lattice but also opens a way to find systems with isolated flat bands.

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