A slanted gate voltage on a Weyl semimetal nanowire can tilt surface Fermi arcs, produce negative refraction between surfaces, and switch off the longitudinal conductance, forming a field-effect transistor.
An ideal Weyl semimetal induced by magnetic exchange
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abstract
Weyl semimetals exhibit exceptional quantum electronic transport due to the presence of topologically-protected band crossings called Weyl nodes. The nodes come in pairs with opposite chirality, but their number and location in momentum space is otherwise material specific. Following the initial discoveries there is now a need for better material realizations, ideally comprising a single pair of Weyl nodes located at or very close to the Fermi level and in an energy window free from other overlapping bands. Here we propose the layered intermetallic EuCd$_2$As$_2$ to be such a system. We show that Weyl nodes in EuCd$_2$As$_2$ are magnetically-induced via exchange coupling, emerging when the Eu spins are aligned by a small external magnetic field. The identification of EuCd$_2$As$_2$ as a model magnetic Weyl semimetal, evidenced here by ab initio calculations, photoemission spectroscopy, quantum oscillations and anomalous Hall transport measurements, opens the door to fundamental tests of Weyl physics.
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cond-mat.mes-hall 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Field-Effect Transistor based on Surface Negative Refraction in Weyl Nanowires
A slanted gate voltage on a Weyl semimetal nanowire can tilt surface Fermi arcs, produce negative refraction between surfaces, and switch off the longitudinal conductance, forming a field-effect transistor.