Optical signature of Weyl electronic structures in tantalum pnictides 
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 P, As)

Kimura, S.; Yokoyama, Hiromichi; Watanabe, Hiroshi; Sichelschmidt, J.; Süß, Vicky; Schmidt, Marcus; Felser, Claudia

doi:10.1103/physrevb.96.075119

Cited by 47 publications

(56 citation statements)

References 40 publications

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“…The relatively large value of ω pl (cf. the results for other nodal semimetals [15][16][17][18]28]) and the fairly high (∼ 10 21 cm −3 ) free-electron density of RhSi, see Fig. 1(d), are consistent with the results of band structure calculations [4,5,20,25], which show that the Fermi level in RhSi is quite deep in the conduction band for the electron momenta near the corners (R points) of the Brillouin zone ( Fig.…”

Section: A Electronic Responsesupporting

confidence: 85%

“…3(a), the match can be considered as satisfactory. One has to keep in mind that calculations of the optical conductivity from the electronic band structure are rather challenging, particularly for semimetals: a survey of the available literature reveals only a qualitative match between the calculated optical conductivity and experimental results for a wide range of nodal semimetals studied recently [18,24,[30][31][32]. Nevertheless, both the low-energy features of the interband experimental σ(ν) -the initial (i.e., for the frequencies just above the Drude roll-off) linear increase and the further flattening -are reproduced by theory.…”

Section: A Electronic Responsementioning

confidence: 99%

“…Because there is no characteristic energy scale, the quasiparticles near the linear-band crossings in three dimensions are expected to be characterized by the interband σ 1 (ω) proportional to the probing light frequency [12][13][14]. Indeed, such linear σ 1 (ω) has been observed in many Dirac and Weyl semimetals [15][16][17][18]. The optical conductivity of the multifold semimetals has also been predicted to demonstrate a linear σ 1 (ω) [19].…”

Section: Introductionmentioning

confidence: 99%

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Optical conductivity of multifold fermions: The case of RhSi

Maulana

Manna²,

Uykur

et al. 2020

Phys. Rev. Research

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We measured the reflectivity of the multifold semimetal RhSi in a frequency range from 80 to 20 000 cm −1 (10 meV -2.5 eV) at temperatures down to 10 K. The optical conductivity, calculated from the reflectivity, is dominated by the free-carrier (Drude) contribution below 1000 cm −1 (120 meV) and by interband transitions at higher frequencies. The temperature-induced changes in the spectra are generally weak -only the Drude bands narrow upon cooling with an unscreened plasma frequency being constant with temperature at approximately 1.4 eV, in agreement with a weak temperature dependence of the free-carrier concentration determined by Hall measurements. The interband portion of conductivity exhibits two linear-in-frequency regions below 5000 cm −1 (∼ 600 meV), a broad flat maximum at around 6000 cm −1 (750 meV), and a further increase starting around 10 000 cm −1 (∼ 1.2 eV). We assign the linear behavior of the interband conductivity to transitions between the linear bands near the band crossing points. Our findings are in accord with the predictions for the low-energy conductivity behavior in multifold semimetals and with earlier computations based on band structure calculations for RhSi.

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Section: A Electronic Responsesupporting

confidence: 85%

Section: A Electronic Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical conductivity of multifold fermions: The case of RhSi

Maulana

Manna²,

Uykur

et al. 2020

Phys. Rev. Research

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“…The zero-field optical data ( Fig. 3) and also the preceding optical study by Kimura et al [33], indeed show in this spectral range a dissipative feature interpreted previously as due to excitations between the saddle points. Nevertheless, the position of this feature nearly coincides with the plasma frequency (cf.…”

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confidence: 84%

Magneto-Optics of a Weyl Semimetal beyond the Conical Band Approximation: Case Study of TaP

et al. 2020

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Landau-level spectroscopy, the optical analysis of electrons in materials subject to a strong magnetic field, is a versatile probe of the electronic band structure and has been successfully used in the identification of novel states of matter such as Dirac electrons, topological materials or Weyl semimetals. The latter arise from a complex interplay between crystal symmetry, spin-orbit interaction and inverse ordering of electronic bands. Here, we report on unusual Landau-level transitions in the monopnictide TaP that decrease in energy with increasing magnetic field. We show that these transitions arise naturally at intermediate energies in time-reversal-invariant Weyl semimetals where the Weyl nodes are formed by a partially gapped nodal-loop in the band structure. We propose a simple theoretical model for electronic bands in these Weyl materials that captures the collected magneto-optical data to great extent. arXiv:1912.07327v1 [cond-mat.mes-hall]

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“…2(a) is typical for the linear band dispersion of Dirac fermions [43,44]. The additional singular kink around 300 cm −1 is characteristic of the single-point singularity in Weyl semimetals, where a van Hove singularity due to saddle points of the conduction and valance bands arises between a pair of Dirac cones with opposite chiralities [45][46][47]. In the pnictides case, theory also predicts a pair of Dirac cones but with the same chirality [11].…”

Section: Resultsmentioning

confidence: 99%

Optical study of Dirac fermions and related phonon anomalies in the antiferromagnetic compound CaFeAsF

Xiao

Gao

et al. 2018

Phys. Rev. B

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We performed optical studies on CaFeAsF single crystals, a parent compound of the 1111-type iron-based superconductors that undergoes a structural phase transition from tetragonal to orthorhombic at T s = 121 K and a magnetic one to a spin density wave (SDW) state at T N = 110 K. In the low-temperature optical conductivity spectrum, after the subtraction of a narrow Drude peak, we observe a pronounced singularity around 300 cm (2017)]. In support of this interpretation, we show that for the latter system this singular feature disappears rapidly upon electron and hole doping, as expected if it arises from a van Hove singularity in between two Dirac cones. Finally, we show that one of the infrared-active phonon modes (the Fe-As mode at 250 cm −1 ) develops a strongly asymmetric line shape in the SDW state and note that this behavior can be explained in terms of a strong coupling with the Dirac fermions.

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Optical signature of Weyl electronic structures in tantalum pnictides TaPn ( Pn= P, As)

Cited by 47 publications

References 40 publications

Optical conductivity of multifold fermions: The case of RhSi

Optical conductivity of multifold fermions: The case of RhSi

Magneto-Optics of a Weyl Semimetal beyond the Conical Band Approximation: Case Study of TaP

Optical study of Dirac fermions and related phonon anomalies in the antiferromagnetic compound CaFeAsF

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