Optical conductivity of the Weyl semimetal NbP

Neubauer, David; Yaresko, A. N.; Li, Weiwu; Löhle, Anja; Hübner, Ralph; Schilling, M. B.; Shekhar, Chandra; Felser, Claudia; Dressel, Martin; Pronin, A. V.

doi:10.1103/physrevb.98.195203

Cited by 28 publications

(41 citation statements)

References 67 publications

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“…The intraband contribution to the spectra can be best fitted with two Drude components, which have different scattering rates. Such multicomponent Drude fits are often used to describe the optical response of multiband systems, particularly different semimetals [23,24,26]. In the case of RhSi, the two-Drude approach can be justified by the presence of a few bands crossing the the Fermi level [4,5,20,25], see The first set provides the dominating contribution to the free-carrier response and is also responsible for the electron type of conduction.…”

Section: A Electronic Responsementioning

confidence: 99%

“…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%

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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 Responsementioning

confidence: 99%

Section: A Electronic Responsementioning

confidence: 99%

Optical conductivity of multifold fermions: The case of RhSi

Maulana

Manna²,

Uykur

et al. 2020

Phys. Rev. Research

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show abstract

“…One of those materials is the semimetallic transitionmetal monopnictide NbP, which has recently stimulated numerous studies [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] . It exhibits a very small Fermi sea consisting of two electron and two hole pockets 18,19 , whose fourfold degeneracy in k space is tied the rotational symmetry of the underlying tetragonal lattice.…”

Section: Introductionmentioning

confidence: 99%

Effect of uniaxial stress on the electronic band structure of NbP

et al. 2020

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The Weyl semimetal NbP exhibits a very small Fermi surface consisting of two electron and two hole pockets, whose fourfold degeneracy in k space is tied to the rotational symmetry of the underlying tetragonal crystal lattice. By applying uniaxial stress, the crystal symmetry can be reduced, which successively leads to a degeneracy lifting of the Fermi-surface pockets. This is reflected by a splitting of the Shubnikov-de Haas frequencies when the magnetic field is aligned along the c axis of the tetragonal lattice. In this study, we present the measurement of Shubnikovde Haas oscillations of single-crystalline NbP samples under uniaxial tension, combined with stateof-the-art calculations of the electronic band structure. Our results show qualitative agreement between calculated and experimentally determined Shubnikov-de Haas frequencies, demonstrating the robustness of the band-structure calculations upon introducing strain. Furthermore, we predict a significant shift of the Weyl points with increasing uniaxial tension, allowing for an effective tuning to the Fermi level at only 0.8 % of strain along the a axis.

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“…1,2 Recently, the transition-metal monopnictides (TaAs, NbAs, TaP, NbP) were predicted to be Weyl semimetals 3,4 and experimentally confirmed as such via angle-resolved photoemission spectroscopy and quantum oscillation measurements of the characteristic bulk dispersion and surface Fermi arcs. 2,[5][6][7][8][9][10][11][12][13][14][15][16] From this discovery sprang reports of the linear and nonlinear optical response of these materials [17][18][19][20][21][22][23] as well as many magnetotransport studies seeking definitive signatures of the chiral anomaly [24][25][26][27] in this family [28][29][30][31][32][33][34][35][36] for further confirmation of the Weyl semimetal phase. While the observation of the chiral anomaly is still a subject of active debate, 2,37,38 reports of these materials' giant magnetoresistance and ultrahigh mobilities make their transport a topic of fundamental importance.…”

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confidence: 99%

Uncovering electron-phonon scattering and phonon dynamics in type-I Weyl semimetals

et al. 2019

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Weyl semimetals are 3D phases of matter with topologically protected states that have remarkable macroscopic transport behaviors. As phonon dynamics and electron-phonon scattering play a critical role in the electrical and thermal transport, we pursue a fundamental understanding of the origin of these effects in type-I Weyl semimetals NbAs and TaAs. In the temperature-dependent Raman spectra of NbAs, we reveal a previously unreported Fano lineshape, a signature stemming from the electron-phonon interaction. Additionally, the temperature dependence of the A 1 phonon linewidths in both NbAs and TaAs strongly deviate from the standard model of anharmonic decay. To capture the mechanisms responsible for the observed Fano asymmetry and the atypical phonon linewidth, we present first principles calculations of the phonon self-energy correction due to the electronphonon interaction. Finally, we investigate the relationship between Fano lineshape, electron-phonon coupling, and locations of the Weyl points in these materials. Through this study of the phonon dynamics and electronphonon interaction in these Weyl semimetals, we consider specific microscopic pathways which contribute to the nature of their macroscopic transport. arXiv:1903.07550v1 [cond-mat.mes-hall]

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Optical conductivity of the Weyl semimetal NbP

Cited by 28 publications

References 67 publications

Optical conductivity of multifold fermions: The case of RhSi

Optical conductivity of multifold fermions: The case of RhSi

Effect of uniaxial stress on the electronic band structure of NbP

Uncovering electron-phonon scattering and phonon dynamics in type-I Weyl semimetals

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