Bulk crystal growth and electronic characterization of the 3D Dirac semimetal Na3Bi

Kushwaha, Satya; Krizan, Jason W.; Feldman, Benjamin E.; Gyenis, András; Randeria, Mallika T.; Xiong, Junlin; Xu, Su-Yang; Alidoust, Nasser; Belopolski, Ilya; Liang, Tian; Hasan, M. Zahid; Ong, N. P.; Yazdani, Ali; Cava, R. J.

doi:10.1063/1.4908158

Cited by 86 publications

(84 citation statements)

References 35 publications

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“…At 5 K, magnetoresistance at high fields is linear with H, and MR reaches 13% at 9 T. Hence, in the metallic regime, the magnetoresistance in the high-field range is linear, not quadratic. The linear MR at low temperatures suggests that the low-T transport is linked to the linear dispersions, as observed in surfaces of topological insulators (Bi,Sb) 2 (Se,Te) 3 21-25 and SmB 6 , 26 Dirac semimetals Cd 3 As 2 27-29 and Na 3 Bi, 30 and other 3D Dirac materials. [31][32][33] In Figs. 3(a) and 3(b), we compare the magnetoresistance at high temperatures [ Fig.…”

Section: (A)]mentioning

confidence: 93%

“…37 On the other hand, linear magnetoresistance can come from quantum effects; [38][39][40] for gapless semiconductors with a linear energy spectrum, magnetoresistance in perpendicular-to-plane magnetic fields becomes linear with magnetic fields at low temperatures. 41 In recently found topological materials, [21][22][23][24][25][26][27][28][29][30] linear magnetoresistance of this mechanism has been observed. In the present case of Ru 2 Sn 3 , since the linear dispersion of the topological surface state was observed near the Fermi level by ARPES measurements at 1 K, 16 Dirac fermions on the topological surface state may be an origin of the linear magnetoresistance at low temperatures.…”

Section: (A)]mentioning

confidence: 99%

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Linear magnetoresistance in a topological insulator Ru2Sn3

Shiomi

Saitoh

2017

AIP Advances

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We have studied magnetotransport properties of a topological insulator material Ru2Sn3. Bulk single crystals of Ru2Sn3 were grown by a Bi flux method. The resistivity is semiconducting at high temperatures above 160 K, while it becomes metallic below 160 K. Nonlinear field dependence of Hall resistivity in the metallic region shows conduction of multiple carriers at low temperatures. In the high-temperature semiconducting region, magnetoresistance exhibits a conventional quadratic magnetic-field dependence. In the low-temperature metallic region, however, high-field magnetoresistance is clearly linear with magnetic fields, signaling a linear dispersion in the low-temperature electronic structure. Small changes in the magnetoresistance magnitude with respect to the magnetic field angle indicate that bulk electron carriers are responsible mainly for the observed linear magnetoresistance.

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Section: (A)]mentioning

confidence: 93%

Section: (A)]mentioning

confidence: 99%

Linear magnetoresistance in a topological insulator Ru2Sn3

Shiomi

Saitoh

2017

AIP Advances

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“…In the solid state, Weyl and Dirac semimetals are described at low energies by chiral fermions that realize a chiral anomaly and host topological surface states with Fermi arcs [4,5]. TaAs was recently theoretically predicted [6,7] and experimentally identified using angle-resolved photoemission spectroscopy [8,9] (ARPES) as being a Weyl semimetal, with Na 3 Bi [10][11][12][13], Cd 3 As 2 [14][15][16][17][18][19][20], and ZrTe 5 [21] likewise identified as Dirac semimetal. Rapidly other materials in the TaAs class were also shown to be Weyl semimetals [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Visualizing the chiral anomaly in Dirac and Weyl semimetals with photoemission spectroscopy

et al. 2016

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Quantum anomalies are the breaking of a classical symmetry by quantum fluctuations. They dictate how physical systems of diverse nature, ranging from fundamental particles to crystalline materials, respond topologically to external perturbations, insensitive to local details. The anomaly paradigm was triggered by the discovery of the chiral anomaly that contributes to the decay of pions into photons and influences the motion of superfluid vortices in 3 He-A. In the solid state, it also fundamentally affects the properties of topological Weyl and Dirac semimetals, recently realized experimentally. In this work we propose that the most identifying consequence of the chiral anomaly, the charge density imbalance between fermions of different chirality induced by nonorthogonal electric and magnetic fields, can be directly observed in these materials with the existing technology of photoemission spectroscopy. With angle resolution, the chiral anomaly is identified by a characteristic note-shaped pattern of the emission spectra, originating from the imbalanced occupation of the bulk states and a previously unreported momentum dependent energy shift of the surface state Fermi arcs. We further demonstrate that the chiral anomaly likewise leaves an imprint in angle averaged emission spectra, facilitating its experimental detection. Thereby, our work provides essential theoretical input to foster the direct visualization of the chiral anomaly in condensed matter, in contrast to transport properties, such as negative magnetoresistance, which can also be obtained in the absence of a chiral anomaly.

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“…Over the last two years, numerous experimental works have confirmed that certain materials such as Na 3 Bi and Cd 3 As 2 are Dirac semimetals by directly observing Dirac cones in the bulk [22][23][24][25][26][27] and Fermi arcs on the surface 28 . Many additional works observing and elucidating transport properties [29][30][31][32][33][34][35][36][37][38] and phase transitions [39][40][41][42][43][44][45][46][47][48][49] in Dirac semimetals have appeared. Even more recently, the first Weyl semimetals were discovered experimentally [50][51][52] , with evidence for Fermi arcs 52 and the unusual transport signatures they entail [53][54][55] .…”

Section: Introductionmentioning

confidence: 99%

Many-body effects and ultraviolet renormalization in three-dimensional Dirac materials

et al. 2015

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We develop a theory for electron-electron interaction-induced many-body effects in threedimensional Weyl or Dirac semimetals, including interaction corrections to the polarizability, electron self-energy, and vertex function, up to second order in the effective fine structure constant of the Dirac material. These results are used to derive the higher-order ultraviolet renormalization of the Fermi velocity, effective coupling, and quasiparticle residue, revealing that the corrections to the renormalization group flows of both the velocity and coupling counteract the leading-order tendencies of velocity enhancement and coupling suppression at low energies. This in turn leads to the emergence of a critical coupling above which the interaction strength grows with decreasing energy scale. In addition, we identify a range of coupling strengths below the critical point in which the Fermi velocity varies non-monotonically as the low-energy, non-interacting fixed point is approached. Furthermore, we find that while the higher-order correction to the flow of the coupling is generally small compared to the leading order, the corresponding correction to the velocity flow carries an additional factor of the Dirac cone flavor number (the multiplicity of electron species, e.g. ground-state valley degeneracy arising from the band structure) relative to the leading-order result. Thus, for materials with a larger multiplicity, the regime of velocity non-monotonicity is reached for modest values of the coupling strength. This is in stark contrast to an approach based on a large-N expansion or the random phase approximation (RPA), where higher-order corrections are strongly suppressed for larger values of the Dirac cone multiplicity. This suggests that perturbation theory in the coupling constant (i.e., the loop expansion) and the RPA/large-N expansion are complementary in the sense that they are applicable in different parameter regimes of the theory. We show how our results for the ultraviolet renormalization of quasiparticle properties can be tested experimentally through measurements of quantities such as the optical conductivity or dielectric function (with carrier density or temperature acting as the scale being varied to induce the running coupling). Although experiments typically access the finite-density regime, we show that our zero-density results still capture clear many-body signatures that should be visible at higher temperatures even in real systems with disorder and finite doping.

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Bulk crystal growth and electronic characterization of the 3D Dirac semimetal Na3Bi

Cited by 86 publications

References 35 publications

Linear magnetoresistance in a topological insulator Ru2Sn3

Linear magnetoresistance in a topological insulator Ru2Sn3

Visualizing the chiral anomaly in Dirac and Weyl semimetals with photoemission spectroscopy

Many-body effects and ultraviolet renormalization in three-dimensional Dirac materials

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