Magnetotransport study of Dirac fermions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>YbMnBi</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>antiferromagnet

Wang, Aifeng; Zaliznyak, Igor; Ren, Weijun; Wu, Lijun; Graf, David; Garlea, V. Ovidiu; Warren, J. B.; Božin, Emil S.; Zhu, Yimei; Petrović, C.

doi:10.1103/physrevb.94.165161

Cited by 85 publications

(79 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One must still reconcile the ARPES data that shows reasonably convincing evidence for Weyl physics 16 , with neutron scattering experiments 19,20 that does not show evidence for canting and our optical data that does not need it. Moreover, we should reiterate that the crystal structure of this compound does not allow for a canted magnetic structure to develop through a second order phase transition.…”

Section: Discussionmentioning

confidence: 76%

“…Although such a band structure is in reasonable agreement with the ARPES results, the ad-hoc assumption of canted antiferromagnetism has not been supported by neutron scattering experiments 19,20 . Moreover, the magnetic space group found via neutron scattering that describes the AFM ordering in YbMnBi 2 has a symmetry breaking that does not allow canting of Mn magnetic moments away from the c axis.…”

Section: Introductionmentioning

confidence: 64%

See 1 more Smart Citation

Optical investigation of the strong spin-orbit-coupled magnetic semimetal YbMnBi2

et al. 2017

View full text Add to dashboard Cite

Strong spin-orbit coupling (SOC) can result in ground states with non-trivial topological properties. The situation is even richer in magnetic systems where the magnetic ordering can potentially have strong influence over the electronic band structure. The class of AMnBi2 (A = Sr, Ca) compounds are important in this context as they are known to host massive Dirac fermions with strongly anisotropic dispersion, which is believed to be due to the interplay between strong SOC and magnetic degrees of freedom. We report the optical conductivity of YbMnBi2, a newly discovered member of this family and a proposed Weyl semi-metal (WSM) candidate with broken time reversal symmetry. Together with density functional theory (DFT) band structure calculations, we show that the complex conductivity can be interpreted as the sum of an intra-band Drude response and inter-band transitions. We argue that the canting of the magnetic moments that has been proposed to be essential for the realization of the WSM in an otherwise antiferromagnetically ordered system is not necessary to explain the optical conductivity. We believe our data is explained qualitatively by the uncanted magnetic structure with a small offset of the chemical potential from strict stochiometry. We find no definitive evidence of a bulk Weyl nodes. Instead we see signatures of a gapped Dirac dispersion, common in other members of AMnBi2 family or compounds with similar 2D network of Bi atoms. We speculate that the evidence for a WSM seen in ARPES arises through a surface magnetic phase. Such an assumption reconciles all known experimental data.

show abstract

Section: Discussionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 64%

Optical investigation of the strong spin-orbit-coupled magnetic semimetal YbMnBi2

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Quantum linear MR has been achieved in n-type InSb [46] and Bi 2 Te 3 nanosheets [50]. The linear MR in Mn-based 112 Dirac materials (Ca/Sr/Ba/Eu/Yb)MnBi 2 is also suggested to be quantum MR [21,26,32,33,35,37]. However, quantum MR is excluded in BaZnBi 2 for the following reasons: (i) the first-principles calculations reveal the absence of stable gapless Dirac cone in BaZnBi 2 .…”

Section: Resultsmentioning

confidence: 99%

“…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.

View full text Add to dashboard Cite

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 .

show abstract

“…Materials in this AMnBi 2 family are expected to host highly anisotropic Dirac dispersions with a finite gap at the Dirac point due to SOC from first principles DFT band calculations. Unfortunately, it appears that the canting of the magnetic moment (10 • ) from the c axis that is believed to be required to split the DSM degeneracies, does not exist Wang et al, 2016a Of particular note is the recent work on Mn 3 Sn and Mn 3 Ge, which are antiferromagnets (AFs) with a non-collinear 120-degree spin order that exhibit a large anomalous Hall conductivity (Kiyohara et al, 2016;Nakatsuji et al, 2015). They have been predicted Zhang et al, 2017c) to be WSMs with several Weyl points as well as trivial bands near the Fermi level.…”

Section: Magnetic Weyl Semimetalsmentioning

confidence: 99%

Weyl and Dirac semimetals in three-dimensional solids

2018

View full text Add to dashboard Cite

Weyl and Dirac semimetals are three dimensional phases of matter with gapless electronic excitations that are protected by topology and symmetry. As three dimensional analogs of graphene, they have generated much recent interest. Deep connections exist with particle physics models of relativistic chiral fermions, and -despite their gaplessness -to solid-state topological and Chern insulators. Their characteristic electronic properties lead to protected surface states and novel responses to applied electric and magnetic fields. The theoretical foundations of these phases, their proposed realizations in solid state systems, recent experiments on candidate materials, as well as their relation to other states of matter are reviewed.

show abstract

Magnetotransport study of Dirac fermions inYbMnBi2antiferromagnet

Cited by 85 publications

References 42 publications

Optical investigation of the strong spin-orbit-coupled magnetic semimetal YbMnBi2

Optical investigation of the strong spin-orbit-coupled magnetic semimetal YbMnBi2

Magneto-transport and electronic structures of BaZnBi₂

Weyl and Dirac semimetals in three-dimensional solids

Contact Info

Product

Resources

About

Magnetotransport study of Dirac fermions inYbMnBi2antiferromagnet

Cited by 85 publications

References 42 publications

Optical investigation of the strong spin-orbit-coupled magnetic semimetal YbMnBi2

Optical investigation of the strong spin-orbit-coupled magnetic semimetal YbMnBi2

Magneto-transport and electronic structures of BaZnBi2

Weyl and Dirac semimetals in three-dimensional solids

Contact Info

Product

Resources

About

Magneto-transport and electronic structures of BaZnBi₂