Journal
NANO LETTERS
Volume 15, Issue 10, Pages 6974-6978Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02978
Keywords
Graphene network; Weyl semimetal; Weyl-like loops; Weyl-like points; flat surface band; surface Fermi arc
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Funding
- National Natural Science Foundation of China [11474243, 51376005, 11204262]
- UT Dallas research enhancement funds
- NSF [DMR-10-1006184]
- Lawrence Berkeley National Laboratory through the Office of Basic Science, US DOE [DE-AC02-05CH11231]
- US DOE [DE-SC0002623]
- [SUTD-SRG-EPD2013062]
- Direct For Mathematical & Physical Scien [1006184] Funding Source: National Science Foundation
- Division Of Materials Research [1006184] Funding Source: National Science Foundation
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Carbon allotropes are subject of intense investigations for their superb structural, electronic, and chemical properties, but not for topological band properties because of the lack of strong spin-orbit coupling (SOC). Here, we show that conjugated p-orbital interactions, common to most carbon allotropes, can in principle produce a new type of topological band structure, forming the so-called Weyl-like semimetal in the absence of SOC. Taking a structurally stable interpenetrated graphene network (IGN) as example, we show, by first-principles calculations and tight-binding modeling, that its Fermi surface is made of two symmetry-protected Weyl-like loops with linear dispersion along perpendicular directions. These loops are reduced to Weyl-like points upon breaking of the inversion symmetry. Because of the topological properties of these band-structure anomalies, remarkably, at a surface terminated by vacuum there emerges a flat band in the loop case and two Fermi arcs in the point case. These topological carbon materials may also find applications in the fields of catalysts.
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