Quasi-two-dimensional massless Dirac fermions in 
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He, Junbao; Fu, Yu; Zhao, Lin; Liang, Hui; Chen, D.; Leng, Yumin; Wang, Xiaoming; Li, J.; Zhang, Si; Xue, Mianqi; Li, C. H.; Zhang, P.; Ren, Zhi-An; Chen, G. F.

doi:10.1103/physrevb.95.045128

Cited by 66 publications

(57 citation statements)

References 34 publications

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“…It should be noted that this applies to a isotropic three-dimensional pocket and not a two-dimensional one, and thus LaCuSb2 appears to display more three-dimensional behavior than other 112 systems. The ultralow carrier mass obtained is found to be smaller than that for other 112 Dirac systems [16][17][18][19][20][21][22][23][24][25][26][27] , and is generally lower than one would expect for conventional (non-Dirac) carriers. These observations provide strong evidence for the presence of Dirac fermions in LaCuSb2.…”

Section: Resultscontrasting

confidence: 58%

“…The bandwidth of these linearly dispersing bands is determined by the Sb-Sb interatomic distance, which is 3.08Å in LaCuSb2. This distance is shorter than in some of the other aforementioned 112 Dirac materials, and thus results in linearly dispersive bands with relatively large bandwidths [16][17][18][19][20][21][22][23][24][25][26][27] . Using a path indicated by the primitive tetragonal Brillouin zone shown in Figure 1b, the calculated DFT band structures for LaCuSb2 excluding and including spin-orbit coupling (SOC) are shown in Figure 1c and Figure 1d, respectively.…”

Section: Resultsmentioning

confidence: 95%

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Dirac fermions and possible weak antilocalization in LaCuSb2

et al. 2019

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Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb2. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy (ARPES), along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically non-trivial effects. Measurements of the Shubnikovde Haas (SdH) quantum oscillations show low effective mass electrons on the order of 0.065me, further confirming the presence of Dirac fermions in this material.

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Section: Resultscontrasting

confidence: 58%

Section: Resultsmentioning

confidence: 95%

Dirac fermions and possible weak antilocalization in LaCuSb2

et al. 2019

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“…1] in these 112-pnictides play host to fermions which can be described by the relativistic Dirac or Weyl equations. Furthermore, the electronic transport in this family of materials also displays large magnetoresistive effects, suggesting a coupling between the magnetism and charge carriers [9][10][11][12][13][14][15][16][17] . These effects could be driven by changes in the electronic band structure topology due to changes in the symmetry of the spin structures induced by the applied field 19 .…”

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confidence: 97%

“…Such control can potentially be realized in materials in which magnetic order coexists with non-trivial electronic band topology. Recent ARPES, quantum oscillation, neutron diffraction and ab initio band structure studies suggest that materials in the AMnSb 2 (A = Ca, Sr, Ba, Eu, Yb) family display many of the required properties [9][10][11][12][13][14][15][16][17][18] . The two-dimensional zig-zag layer of Sb atoms [ Fig.…”

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confidence: 99%

Magnetic and electronic structure of Dirac semimetal candidate EuMnSb2

et al. 2019

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We report an experimental study of the magnetic order and electronic structure and transport of the layered pnictide EuMnSb2, performed using neutron diffraction, angle-resolved photoemission spectroscopy (ARPES), and magnetotransport measurements. We find that the Eu and Mn sublattices display antiferromagnetic (AFM) order below T Eu N = 21(1) K and T Mn N = 350(2) K respectively. The former can be described by an A-type AFM structure with the Eu spins aligned along the c axis (an in-plane direction), whereas the latter has a C-type AFM structure with Mn moments along the a-axis (perpendicular to the layers). The ARPES spectra reveal Dirac-like linearly dispersing bands near the Fermi energy. Furthermore, our magnetotransport measurements show strongly anisotropic magnetoresistance, and indicate that the Eu sublattice is intimately coupled to conduction electron states near the Dirac point. 75.30.Gw, 74.70.Xa Topological semimetals can host quasiparticle excitations which masquerade as massless fermions due to the linearly-dispersing electronic bands created by interactions with the crystal lattice. The Dirac or Weyl nodes, where the conduction and valence bands meet in momentum space, are robust against small perturbations due to the protection afforded by crystalline symmetries or the topology of the electronic bands 1-5 . Topological semimetals exhibit exceptional electronic transport properties (e.g. extremely high carrier mobility and large linear magnetoresistance) and the control of these exotic charge carriers could help realize a new generation of spintronic devices with low power consumption 6-8 .Such control can potentially be realized in materials in which magnetic order coexists with non-trivial electronic band topology. Recent ARPES, quantum oscillation, neutron diffraction and ab initio band structure studies suggest that materials in the AMnSb 2 (A = Ca, Sr, Ba, Eu, Yb) family display many of the required properties 9-18 . The two-dimensional zig-zag layer of Sb atoms [ Fig. 1] in these 112-pnictides play host to fermions which can be described by the relativistic Dirac or Weyl equations. Furthermore, the electronic transport in this family of materials also displays large magnetoresistive effects, suggesting a coupling between the magnetism and charge carriers 9-17 . These effects could be driven by changes in the electronic band structure topology due to changes in the symmetry of the spin structures induced by the applied field 19 .Within the AMnSb 2 family, EuMnSb 2 is of particular interest because the conducting zig-zag layer of Sb atoms is sandwiched between two interpenetrating magnetic sublattices (Eu and Mn), as shown in Fig. 1(a). Such a structure may lead to an enhancement of the coupling between the topological quasiparticles and mag-netism, compared to that in compounds with a nonmagnetic atom on the A site. The dramatic magnetoresistive behaviour observed in a recent work 20 is evidence for the importance of this coupling. Up to now, however, the nature of the magnetic order in...

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“…The Mn-based ternary 112 type compounds (Ca/Sr/Ba/Eu/Yb)MnBi 2 [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] and (Ca/Sr/Ba/Yb)MnSb 2 [38][39][40][41][42] have been established as Dirac materials. In particular, YbMnBi 2 [36] and Sr 1−y Mn 1−z Sb 2 [38] have been further suggested as hosting time reversal symmetry (TRS) breaking Weyl fermions.…”

Section: Introductionmentioning

confidence: 99%

Magneto-transport and electronic structures of BaZnBi₂

Wang

Guo

et al. 2017

New J. Phys.

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We report the magneto-transport properties and electronic structures of BaZnBi 2 . BaZnBi 2 is a quasitwo-dimensional material with metallic behavior. Transverse magnetoresistance (MR) depends on magnetic field linearly and exhibits Shubnikov-de Haas (SdH) oscillation at low temperature and high field. The observed linear MR may originate from the disorder in samples or the edge conductivity in compensated two-component systems. The first-principles calculations reveal the absence of stable gapless Dirac fermion. Combined with the trivial Berry phase extracted from the SdH oscillation, BaZnBi 2 is suggested as a topologically trivial semimetal. Nearly compensated electron-like Fermi surfaces (FSs) and hole-like FSs coexist in BaZnBi 2 .

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Quasi-two-dimensional massless Dirac fermions in CaMnSb2

Cited by 66 publications

References 34 publications

Dirac fermions and possible weak antilocalization in LaCuSb2

Dirac fermions and possible weak antilocalization in LaCuSb2

Magnetic and electronic structure of Dirac semimetal candidate EuMnSb2

Magneto-transport and electronic structures of BaZnBi₂

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Quasi-two-dimensional massless Dirac fermions in CaMnSb2

Cited by 66 publications

References 34 publications

Dirac fermions and possible weak antilocalization in LaCuSb2

Dirac fermions and possible weak antilocalization in LaCuSb2

Magnetic and electronic structure of Dirac semimetal candidate EuMnSb2

Magneto-transport and electronic structures of BaZnBi2

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Product

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About

Magneto-transport and electronic structures of BaZnBi₂