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2016 ; 7
(ä): 10769
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Aharonov-Bohm oscillations in Dirac semimetal Cd3As2 nanowires
#MMPMID26902716
Wang LX
; Li CZ
; Yu DP
; Liao ZM
Nat Commun
2016[Feb]; 7
(ä): 10769
PMID26902716
show ga
Three-dimensional Dirac semimetals, three-dimensional analogues of graphene, are
unusual quantum materials with massless Dirac fermions, which can be further
converted to Weyl fermions by breaking time reversal or inversion symmetry.
Topological surface states with Fermi arcs are predicted on the surface and have
been observed by angle-resolved photoemission spectroscopy experiments. Although
the exotic transport properties of the bulk Dirac cones have been demonstrated,
it is still a challenge to reveal the surface states via transport measurements
due to the highly conductive bulk states. Here, we show Aharonov-Bohm
oscillations in individual single-crystal Cd3As2 nanowires with low carrier
concentration and large surface-to-volume ratio, providing transport evidence of
the surface state in three-dimensional Dirac semimetals. Moreover, the quantum
transport can be modulated by tuning the Fermi level using a gate voltage,
enabling a deeper understanding of the rich physics residing in Dirac semimetals.