Optical conductivity of triple point fermions

Habibi, Alireza; Farajollahpour, T.; Jafari, S. A.

doi:10.1088/1361-648x/abd739

Cited by 7 publications

(5 citation statements)

References 89 publications

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“…This is because d 3 is the same for all three cases. The results of the linear triple case are in accordance with previous studies [26,31]. However, σ zz strongly relies on the monopole charge N .…”

Section: Optical Conductivities Of Low-energy Modelssupporting

confidence: 91%

“…Experimentally, it has been demonstrated in chiral multifold semimetals PdGa [27], GdPtBi [13], RhSi [28,29], and CoSi [30], which is perfectly linear in a broad range of optical frequency. Habibi et al theoretically included an angular parameter in the Hamiltonian to find the strong angular parameter dependence in both Drude and interband optical conductivities [31]. Also, with the help of the first-principles band calculation, the dynamical conductivities were calculated in CoSi [32] and PdGa [33].…”

Section: Introductionmentioning

confidence: 99%

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Optical conductivities in triple fermions with different monopole charges

Chen¹,

Wang²

2021

J. Phys.: Condens. Matter

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We investigate the linear optical conductivities of the newly-discovered triple-component semimetals. Due to the exactly ﬂat band, the optical conductivity relates to the transition between the zero band and the conduction band directly reﬂecting the band structure of the conduction electrons in contrast to the other materials. For the low-energy models with various monopole charges, the diagonal conductivities show strong anisotropy. The ω-dependence of interband conductivities for a general low-energy model is deduced. The real part of the interband σ_xx always linearly depends on the optical frequency, while the one of σ_zz is proportional to ω^{2/n-1}. This can be a unique ﬁngerprint of the monopole charge. For the lattice models, there also exists the optical anomalous Hall conductivity, where a sign change may appear. The characteristic frequencies of the kink structures are calculated, strictly. Our work will help us to establish the basic picture of linear optical response in topological triple-component semimetals and identify them from other materials.

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Section: Optical Conductivities Of Low-energy Modelssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Optical conductivities in triple fermions with different monopole charges

Chen¹,

Wang²

2021

J. Phys.: Condens. Matter

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“…The optical conductivity of 3D higher-spin fermions was studied in Refs. [50][51][52][53]. A natural intermediate step between 2D and 3D systems is to consider a few-layer system, which, as bilayer graphene, might reveal a different set of properties, see Ref.…”

Section: Introductionmentioning

confidence: 99%

Optical conductivity of bilayer dice lattices

Sukhachov¹,

Oriekhov²,

Gorbar³

2023

Preprint

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We calculate optical conductivity for bilayer dice lattices whose commensurate stackings and effective models in the vicinity of band-crossing points were considered in our previous work [1]. The inter-band optical conductivity reveals a rich activation behavior unique for each of the four stackings. We found that the intermediate energy band, which corresponds to the flat band of a single-layer dice lattice, plays a different role for different stackings. The results for effective and tight-binding models are found to be in qualitative agreement for some of the stackings and the reasons for the discrepancies for others are identified. Our findings propose optical conductivity as an effective tool to distinguish between different stackings in bilayer dice lattices.

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“…Therefore on some lattices fermions can have non-spinor representation [5]. For example the effective theory of fermions may acquire a spin-1 representation [6,7]. Such novel forms of fermions are manifestations of the atomic scale symmetries that are encoded into the space group.…”

Section: Introductionmentioning

confidence: 99%

Kinetic theory of tilted Dirac cone materials

A.¹,

Torabian²,

A.³

2022

Preprint

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We formulate the Boltzmann kinetic equations for interacting tilted Dirac fermions in two space dimensions characterized by a tilt parameter 0 ≤ ζ < 1. Solving the linearized Boltzmann equation, we find that the broadening of the Drude pole is enhanced by κ, where the κ is interaction-induced enhancement factor. The intensity of the Drude pole is also anisotropically enhanced by (1−ζ 2 ) −1 . The ubiquitous "redshift" factors (1 − ζ 2 ) 1/2 can be regarded as a manifestation of an underlying spacetime structure in such solids. The additional broadening κ indicates that interaction effects are more pronounced for electrons in a ζ-deformed Minkowski spacetime of tilted Dirac fermions.

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Optical conductivity of triple point fermions

Cited by 7 publications

References 89 publications

Optical conductivities in triple fermions with different monopole charges

Optical conductivities in triple fermions with different monopole charges

Optical conductivity of bilayer dice lattices

Kinetic theory of tilted Dirac cone materials

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