期刊
PHYSICAL REVIEW B
卷 83, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.205101
关键词
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资金
- National Key Project for Basic Research of China [2011CB922101, 2010CB923404]
- NSFC [10774067, 10974082]
- DOE [SE-FC02-06ER25793]
- Kavli Institute for Theoretical Physics
- US Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [NSF-DMR 0645691]
We investigate novel phases that emerge from the interplay of electron correlations and strong spin-orbit interactions. We focus on describing the topological semimetal, a three-dimensional phase of a magnetic solid, and argue that it may be realized in a class of pyrochlore iridates (such as Y(2)Ir(2)O(7)) based on calculations using the LDA + U method. This state is a three-dimensional analog of graphene with linearly dispersing excitations and provides a condensed-matter realization of Weyl fermions that obeys a two-component Dirac equation. It also exhibits remarkable topological properties manifested by surface states in the form of Fermi arcs, which are impossible to realize in purely two-dimensional band structures. For intermediate correlation strengths, we find this to be the ground state of the pyrochlore iridates, coexisting with noncollinear magnetic order. A narrow window of magnetic axion insulator may also be present. An applied magnetic field is found to induce a metallic ground state.
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