Two-dimensional Dirac fermions and quantum magnetoresistance in CaMnBi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>

Wang, Kefeng; Graf, David; Wang, Limin; Lei, Hechang; Tozer, S. W.; Petrović, C.

doi:10.1103/physrevb.85.041101

Cited by 131 publications

(187 citation statements)

References 27 publications

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“…The mobility is similar to other Dirac materials such as AMnBi 2 (A = Sr,Ca), LaBi and doped WTe 2 . 23,[44][45][46] The large carrier density indicates that WP 2 is different from a compensated semimetal. We calculate the ρ (T, B) using carrier concentrations n e (n h ) and mobilities µ e (µ h ) obtained by two band model fitting of ρ xy , as shown in in Fig.3(d).…”

Section: 40mentioning

confidence: 99%

Large magnetoresistance in the type-II Weyl semimetal WP2

et al. 2017

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We report magnetotransport study on type-II Weyl semimetal WP2 single crystals. Magnetoresistance (MR) exhibits a nonsaturating H n field dependence (14,300% at 2 K and 9 T) whereas systematic violation of Kohler's rule was observed. Quantum oscillations reveal a complex multiband electronic structure. The cyclotron effective mass close to the mass of free electron me was observed in quantum oscillations along b-axis, while reduced effective mass of about 0.5me was observed in a-axis quantum oscillations, suggesting Fermi surface anisotropy. Temperature dependence of the resistivity shows a large upturn that cannot be explained by the multi-band magnetoresistance of conventional metals. Even though crystal structure of WP2 is not layered as in transition metal dichalcogenides, quantum oscillations suggest partial two-dimensional character.

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Section: 40mentioning

confidence: 99%

Large magnetoresistance in the type-II Weyl semimetal WP2

et al. 2017

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“…For example, non-saturating linear MR has been observed in polycrystalline materials with open Fermi surfaces 2 , in Dirac materials [3][4][5] where all the Dirac Fermions can be collapsed into the lowest Landau level by a strong magnetic field 6 , and in inhomogeneous materials [7][8][9] where the mobility fluctuations play an important role 10 .…”

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confidence: 99%

Magneto-resistance up to 60 Tesla in topological insulator Bi2Te3 thin films

Zhang

McDonald

Shekhter

et al. 2012

Applied Physics Letters

100

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We report magneto-transport studies of topological insulator Bi 2 Te 3 thin films grown by pulsed laser deposition. A non-saturating linear-like magneto-resistance (MR) is observed at low temperatures in the magnetic field range from a few Tesla up to 60 Tesla. We demonstrate that the strong linear-like MR at high field can be well understood as the weak antilocalization phenomena described by Hikami-Larkin-Nagaoka theory. Our analysis suggests that in our system, a topological insulator, the elastic scattering time can be longer than the spin-orbit scattering time. We briefly discuss our results in the context of Dirac Fermion physics and 'quantum linear magnetoresistance'.

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“…By means of time-resolved ARPES (TARPES), we study the ultrafastly-induced dynamics in SrMnBi 2 , which is a new type of Dirac materials that has layers of quasi-two-dimensional Dirac fermions [34][35][36][37][38]. Utilizing the high energy resolution and stability of our apparatus [39], we investigated the carrier dynamics induced by various pump-power values (P 's).…”

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Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal

et al. 2016

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There is still no general consensus on how one can describe the out-of-equilibrium phenomena in matter induced by an ultrashort light pulse. We investigate the pulse-induced dynamics in a layered Dirac semimetal SrMnBi2 by pump-and-probe photoemission spectroscopy. At 1 ps, the electronic recovery slowed upon increasing the pump power. Such a bottleneck-type slowing is expected in a two-temperature model (TTM) scheme, although opposite trends have been observed to date in graphite and in cuprates. Subsequently, an unconventional power-law cooling took place at ∼100 ps, indicating that spatial heat diffusion is still ill defined at ∼100 ps. We identify that the successive dynamics before the emergence of heat diffusion is a canonical realization of a TTM scheme. Criteria for the applicability of the scheme is also provided.

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Two-dimensional Dirac fermions and quantum magnetoresistance in CaMnBi2

Cited by 131 publications

References 27 publications

Large magnetoresistance in the type-II Weyl semimetal WP2

Large magnetoresistance in the type-II Weyl semimetal WP2

Magneto-resistance up to 60 Tesla in topological insulator Bi2Te3 thin films

Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal

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