期刊
PHYSICAL REVIEW B
卷 96, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.96.041202
关键词
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资金
- MEXT KAKENHI [JP17K05490, 25400317, 15H05854]
- CREST, JST [JPMJCR16F1]
- Grants-in-Aid for Scientific Research [15H05854, 17K05490] Funding Source: KAKEN
We propose a type of Hopf semimetal indexed by a pair of numbers (p,q), where the Hopf number is given by pq. The Fermi surface is given by a preimage of the Hopf map, which consists of loops nontrivially linked for a nonzero Hopf number. The Fermi surface forms a torus link, whose examples are a Hopf link indexed by (1,1), Solomon's knot (2,1), a double Hopf link (2,2), and a double trefoil knot (3,2). We may choose p or q to be a half integer, where the Fermi surface is a torus knot, such as a trefoil knot (3/2,1). It is even possible to make the Hopf number an arbitrary rational number, where a semimetal whose Fermi surface forms open strings is generated.
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