# Linear and nonlinear optical responses in the chiral multifold semimetal RhSi

@article{Ni2020LinearAN, title={Linear and nonlinear optical responses in the chiral multifold semimetal RhSi}, author={Zhuoliang Ni and B. Xu and Miguel-{\'A}ngel S{\'a}nchez-Mart{\'i}nez and Yang Zhang and Kaustuv Manna and Christian Bernhard and J{\"o}rn W. F. Venderbos and Fernando de Juan and Claudia Felser and Adolfo G. Grushin and Liang Wu}, journal={npj Quantum Materials}, year={2020}, volume={5}, pages={1-10} }

Chiral topological semimetals are materials that break both inversion and mirror symmetries. They host interesting phenomena such as the quantized circular photogalvanic effect (CPGE) and the chiral magnetic effect. In this work, we report a comprehensive theoretical and experimental analysis of the linear and nonlinear optical responses of the chiral topological semimetal RhSi, which is known to host multifold fermions. We show that the characteristic features of the optical conductivity…

## 36 Citations

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U.S.A

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## References

SHOWING 1-10 OF 77 REFERENCES

### Circular Photogalvanic Effect in the Weyl Semimetal TaAs

- Physics
- 2017

Weyl semimetal (WSM) is expected to be an ideal spintronic material owing to its spin currents carried by the bulk and surface states with spin-momentum locking. The generation of a sizable…

### Optical signatures of multifold fermions in the chiral topological semimetal CoSi

- PhysicsProceedings of the National Academy of Sciences
- 2020

The presence and the energy range of various exotic multifold quasiparticles in the optical responses are revealed and experimental evidence for the realization of fourfold spin-3/2 fermions is provided, which were not directly observed previously.

### Ab initio study of quantized circular photogalvanic effect in chiral multifold semimetals

- Physics
- 2020

So far, the circular photogalvanic effect (CPGE) is the only possible quantized signal in Weyl semimetals. With inversion and mirror symmetries broken, Weyl and multifold fermions in band structures…

### Unconventional Photocurrents from Surface Fermi Arcs in Topological Chiral Semimetals.

- PhysicsPhysical review letters
- 2020

It is demonstrated that Fermi arc photogalvanic currents can be perpendicular to the bulk injection currents regardless of the choice of materials surface, which reveals a powerful notion where common crystalline symmetry can be used to completely disentangle bulk and surface optical responses in many conducting material families.

### Helicity-dependent photocurrents in the chiral Weyl semimetal RhSi

- PhysicsScience Advances
- 2020

Measurements of CPGE in the chiral Weyl semimetal RhSi are reported, revealing a C PGE response in an energy window that closes at 0.65 eV, in agreement with the predictions of density functional theory.

### Optical conductivity of multifold fermions: The case of RhSi

- PhysicsPhysical Review Research
- 2020

We measured the reflectivity of the multifold semimetal RhSi in a frequency range from 80 to 20000 cm$^{-1}$ (10 meV - 2.5 eV) at temperatures down to 10 K. The optical conductivity, calculated from…

### Robust edge photocurrent response on layered type II Weyl semimetal WTe2

- PhysicsNature Communications
- 2019

A robust photocurrent generated from charge separation of photoexcited electron-hole pairs at the edge of a type-II Weyl semimetal, Td-WTe2, due to crystalline-symmetry breaking along certain crystal fracture directions is demonstrated.

### Strong bulk photovoltaic effect in chiral crystals in the visible spectrum

- Physics, Materials SciencePhysical Review B
- 2019

Structurally chiral materials hosting multifold fermions with large topological number have attracted considerable attention because of their naturally long surface Fermi arcs and bulk quantized…

### Difference frequency generation in topological semimetals

- PhysicsPhysical Review Research
- 2020

When two lasers are applied to a non-centrosymmetric material, light can be generated at the difference of the incoming frequencies $\Delta\omega$, a phenomenon known as difference frequency…

### Linear electro‐optic effects in zinc blende semiconductors

- Physics
- 1985

Linear electro‐optic effects in zincblende semiconductors are theoretically analyzed by means of a microscopic simple model without any fitting of parameters. Faust–Henry, second harmonic generation,…