Dowsing for nodal lines in a topological semimetal

Mele, E. J.

doi:10.1073/pnas.1820331116

Cited by 6 publications

(2 citation statements)

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“…In the absence of a magnetic field, the case we examine first, the optical response of NbAs 2 at low photon energies comprises direct signatures of nodal lines. [ 26 , 32 , 33 ] Two steps are clearly visible at the onset of interband absorption in the optical conductivity (bottom panel of Figure 1d ). They correspond to the local band gaps: 2Δ D = (88 ± 2) meV and 2Δ F = (113 ± 2) meV, at the dispersive and flat parts, respectively.…”

Section: Optical and Magneto‐optical Response Of Nbasmentioning

confidence: 99%

“…While such behavior resembles systems with 3D conical bands, [ 34 , 35 , 36 ] in NbAs 2 , it is due to the occupation effect (Pauli‐blocking) along the dispersive part of the nodal line. [ 26 , 32 , 37 , 38 ] The anisotropy of the optical response (Figure 1d ) reflects the orientation of the nodal lines, implying significantly higher Drude‐type and interband absorption strength for the radiation polarized along the b ‐axis which is approximately perpendicular to

. [ 26 ] Strong anisotropy, implying notably elongated Fermi surfaces, was also observed in magneto‐transport experiments.…”

Section: Optical and Magneto‐optical Response Of Nbasmentioning

confidence: 99%

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Lorentz‐Boost‐Driven Magneto‐Optics in a Dirac Nodal‐Line Semimetal

et al. 2022

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Optical response of crystalline solids is to a large extent driven by excitations that promote electrons among individual bands. This allows one to apply optical and magneto‐optical methods to determine experimentally the energy band gap —a fundamental property crucial to our understanding of any solid—with a great precision. Here it is shown that such conventional methods, applied with great success to many materials in the past, do not work in topological Dirac semimetals with a dispersive nodal line. There, the optically deduced band gap depends on how the magnetic field is oriented with respect to the crystal axes. Such highly unusual behavior is explained in terms of band‐gap renormalization driven by Lorentz boosts which results from the Lorentz‐covariant form of the Dirac Hamiltonian relevant for the nodal line at low energies.

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Section: Optical and Magneto‐optical Response Of Nbasmentioning

confidence: 99%

. [ 26 ] Strong anisotropy, implying notably elongated Fermi surfaces, was also observed in magneto‐transport experiments.…”

Section: Optical and Magneto‐optical Response Of Nbasmentioning

confidence: 99%

Lorentz‐Boost‐Driven Magneto‐Optics in a Dirac Nodal‐Line Semimetal

et al. 2022

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Electronic correlations in nodal-line semimetals

et al. 2020

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