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transition at Ny = 7, while BxNRs remain metallic. Introduction The discovery of graphene [1] ushers in an era of two-dimensional (2-d) atom or unit cell thick materials, from boron nitride [2-5], transition- metal dichalcogenides (TMDCs) [6-9], phosphorene [10-12], to silicone [13-16]. These materials exhibit novel and unusual electronic, magnetic, optical, and mechanical properties, thereby becoming promising material candidates for next-generation information technology devices. In particular, the carbon-based atom-thick 2-d materials, namely, graphene and graphene nanoribbons (GNRs), have become a new paradigm in condensed matter physics and device engineering research [17-29]. From graphene to GNRs, the change is not merely morphological. Compared to graphene, GNRs exhibit many novel electronic and spin transport properties [21, 27-29], more importantly, GNRs less than 10 nm wide obtain an electronic band gap [21, 27, 28] owing to the contribution of edge states. While graphene is a zero-gap semimetal, both zigzag graphene nanoribbons (ZGNRs) and armchair graphene nanoribbon (AGNRs) are semiconductors. [26] In addition, hydrogenated ZGNRs adopt an anti- ferromagnetic (AFM) ground state along with a ferromagnetic (FM) meta- stable state, hydrogenated AGNRs are non-magnetic (NM), while graphene is NM. [26] With increasing ribbon width, GNRs crossovers toPDF Image | Magnetic Properties of Borophene Nanoribbons
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