On the conduction band anisotropy in semimagnetic semiconducting (Cd1−xMnx)3As2 alloys

Blom, F.A.P.; Neve, J.J.; Nouwens, Peter

doi:10.1016/0378-4363(83)90561-2

Cited by 2 publications

(2 citation statements)

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“…In sharp contrast to the MR, varying θ has very little effect on the cross-section S F of the Fermi Surface (FS) inferred from the SdH period in all samples. The weak variation of S F with θ (inset) implies a nearly spherical FS and isotropic v F , in good agreement with earlier experiments [16,18]. This contrasts with the strong anisotropy γ shown in Fig.…”

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confidence: 92%

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Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd3As2

et al. 2014

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Dirac semimetals and Weyl semimetals are 3D analogs of graphene in which crystalline symmetry protects the nodes against gap formation [1-3]. Na3Bi and Cd3As2 were predicted to be Dirac semimetals [4, 5], and recently confirmed to be so by photoemission [6-8]. Several novel transport properties in a magnetic field H have been proposed for Dirac semimetals [2, 10, 11, 16]. Here we report an interesting property in Cd3As2 that was unpredicted, namely a remarkable protection mechanism that strongly suppresses back-scattering in zero H. In single crystals, the protection results in ultrahigh mobility, 9 × 10 6 cm 2 /Vs at 5 K. Suppression of backscattering results in a transport lifetime 10 4 × longer than the quantum lifetime. The lifting of this protection by H leads to a very large magnetoresistance. We discuss how this may relate to changes to the Fermi surface induced by H.

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confidence: 92%

“…1D). Hence we conclude that the anomalously low residual resistivities arise from mobilities that attain ultrahigh values of 10 7 cm 2 /Vs, far higher than in previous studies [16][17][18]. For comparison, the highest electron mobility in Bi is reported [8] to be 9 × 10 7 cm 2 /Vs (see SI).…”

Section: Pacs Numbersmentioning

confidence: 43%