Accurate magneto-optical determination of radius of topological nodal-ring semimetals

Duan, Wenye; Yang, Chaoqun; Ma, Zhongshui; Zhu, Yiming; Zhang, Chaofeng

doi:10.1103/physrevb.99.045124

Cited by 14 publications

(9 citation statements)

References 54 publications

(80 reference statements)

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“…We note that a low-energy mode with a very similar behavior in magnetic field (constant energy position and strength increasing with B) was observed, but remained unexplained, in another gapped NLSM, NbAs 2 [19]. It would be tempting to assign both modes to the B-independent resonance, recently theoretically proposed to be a hallmark of the NLSM state [27]. However, the model used in this reference (a single nodal loop formed by crossing cones) is far too simple and not directly applicable to ZrSiS or NbAs 2 : both compounds possess complex and extended nodal lines.…”

mentioning

confidence: 63%

Magneto-optical probe of the fully gapped Dirac band in ZrSiS

Uykur

Maulana

Schoop

et al. 2019

Phys. Rev. Research

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We present a far-infrared magneto-optical study of the gapped nodal-line semimetal ZrSiS in magnetic fields B up to 7 T. The observed field-dependent features, which represent intra-(cyclotron resonance) and interband transitions, develop as √ B in increasing field and can be consistently explained within a simple 2D Dirac band model with a gap of 26 meV and an averaged Fermi velocity of 3 × 10 5 m/s. This indicates a rather narrow distribution of these parameters along the in-plane portions of the nodal line in the Brillouin zone. A field-induced feature with an energy position that does not depend on B is also detected in the spectra. Possible origins of this feature are discussed.

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mentioning

confidence: 63%

Magneto-optical probe of the fully gapped Dirac band in ZrSiS

Uykur

Maulana

Schoop

et al. 2019

Phys. Rev. Research

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“…2, we carefully label each LL transition, and observe that, the selection rules are n → n in the longitudinal conductivity Re(σ xx ), and n → n ± 2 in the transverse conductivity Re(σ zz ). The former selection rules are the same as the previous magneto-optic studies of E B [19,[28][29][30][31]; whereas the latter ones are distinctively different from the previous studies of E ⊥ B with conventional selection rules given as n → n ± 1 [10,16,19,[26][27][28][29][30]32].…”

mentioning

confidence: 87%

“…where V is the volume of the system, f (x) is the Fermi-Dirac distribution function, J α = −ie[r α , H] is the current density operator, α = x, z is the oscillating direction of the electric field E, and 1 τ denotes the linewidth broadening induced by the impurity scattering [26,27]. We choose the Fermi energy at zero energy and set the temperature to be zero, so the index s = −1 and s = 1.…”

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confidence: 99%

Unconventional Optical Selection Rules in ZrTe5 under an In-plane Magnetic Field

Wang¹,

Li²

2022

Preprint

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The optical selection rules of an electron system under a magnetic field play key roles in determining its optical properties, from which the band structures and underlying symmetries can be derived. In this Letter, based on a three-dimensional strong topological insulator model describing ZrTe5, we study the Landau levels (LLs) and magneto-optical conductivity under an in-plane magnetic field. We reveal that in the transverse conductivity Re(σzz), the unconventional optical selection rules n → n ± 2 dominate, with n being the LL index. We attribute the unconventional selection rules to the peculiar distribution of parity carried by the LLs, resulting from the chiral symmetry of the sub-Hamiltonians. Moreover, we predict that, if the strong anisotropic system is tuned to be nearly isotropic, the LLs would redistribute and the conventional selection rules n → n ± 1 can be recovered.

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“…To realistically deal with the impurity scatterings, one would apply the self-consistent Born approximation, as it can calculate the impurity-induced self-energy in an effective way [39][40][41][42]. Because the imaginary part of the self-energy will broaden the spectral densities, here we try to phenomenologically capture the effect of the self-energy by considering a finite linewidth Γ [21,[43][44][45] in the DOS and optical conductivity [Eqs. (4) and ( 5)].…”

Section: Finite Linewidth γmentioning

confidence: 99%

Gapped Dirac semimetal with mixed linear and parabolic dispersions

Wang

2021

Phys. Rev. B

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In this paper, we make a comprehensive study of the properties of a gapped Dirac semimetal model, which was originally proposed in the magnetoinfrared spectroscopy measurement of ZeTe5, and includes both the linear and parabolic dispersions in all three directions. We find that, depending on the band inversion parameters, ζ and ζ z , the model can support three different phases: the single Dirac point (DP) phase, the double DPs phase and the Dirac ring phase. The three different phases can be distinguished by their low-energy features in the density of states (DOS) and optical conductivity. At high energy, both the DOS and optical conductivity exhibit power-law like behaviors, with the asymptotic exponents depending heavily on the signs of ζ and ζ z . Moreover, the thumb-of-rule formula between the DOS and optical conductivity is satisfied only when (ζ , ζ z ) > 0. The implications of our results for experiments are discussed.

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Accurate magneto-optical determination of radius of topological nodal-ring semimetals

Abstract: Accurate magneto-optical determination of radius of topological nodal-ring Accurate magneto-optical determination of radius of topological nodal-ring semimetals semimetals

Cited by 14 publications

References 54 publications

Magneto-optical probe of the fully gapped Dirac band in ZrSiS

Magneto-optical probe of the fully gapped Dirac band in ZrSiS

Unconventional Optical Selection Rules in ZrTe5 under an In-plane Magnetic Field

Gapped Dirac semimetal with mixed linear and parabolic dispersions

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