Anisotropic electrodynamics of type-II Weyl semimetal candidate 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>WTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Frenzel, Alex; Homes, C. C.; Gibson, Quinn; Shao, Yinming; Post, Kirk; Charnukha, Aliaksei; Cava, R. J.; Basov, D. N.

doi:10.1103/physrevb.95.245140

Cited by 82 publications

(87 citation statements)

References 48 publications

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“…For example, the peaks at about 240 meV and 1.6 eV of

Re σ_{x x}

, and the peaks at about 240 meV, 750 meV, and 1.25 eV of

Re σ_{y y}

, respectively, are measured and reported in ref. []. Similarly, our obtained peaks at 100 meV of

Re σ_{x x}

and at 750 meV of

Re σ_{y y}

agree with those from the recent report on bulk

{MoTe}_{2}

.…”

Section: Resultssupporting

confidence: 92%

“…Although the appearance of peaks in the optical spectra is due to interband transitions, the observed linear increase with frequency may be attributed to the Dirac‐like energy spectra of these 3D materials, as shown by effective models calculations within the linear response Kubo approach . Our calculated results agree reasonably well with the previously reported experimental measurements for bulk

{WTe}_{2}

. For example, the peaks at about 240 meV and 1.6 eV of

Re σ_{x x}

, and the peaks at about 240 meV, 750 meV, and 1.25 eV of

Re σ_{y y}

, respectively, are measured and reported in ref.…”

Section: Resultssupporting

confidence: 89%

“…There are a limited number of experimental studies reporting measurements for the optical properties of

{WTe}_{2}

. These results show an overall approximately linear increase in the optical conductivity with frequency and they are analyzed in terms of a Drude model with two types of carriers.…”

Section: Resultsmentioning

confidence: 99%

“…These results show an overall approximately linear increase in the optical conductivity with frequency and they are analyzed in terms of a Drude model with two types of carriers. However, probing the Weyl physics of this material in its optical response has proven difficult due to limitations of the measurement techniques or difficulties in relating energy band transitions involving Weyl points to signatures in the optical spectra . For the case of

T_{d}

{MoTe}_{2}

, to our knowledge there is only one very recent report on its optical spectrum .…”

Section: Resultsmentioning

confidence: 99%

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Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions

Popescu

Pertsova

Balatsky

et al. 2020

Advcd Theory and Sims

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A first‐principles investigation of the optical response of the Weyl Semimetals MoTe2 and WTe2 is presented. The approach, based on combining two formulations, allows to both separate the intraband and interband parts of the optical conductivity and to distinguish between the bulk and surface contributions to the optical response. It is found that the response is truly anisotropic, with peaks that can be associated with interband transitions involving either bulk or surface states. The role of the relaxation time, and the relation of the calculated results with available experimental measurements, are also discussed. Furthermore, the approach reported is transferable to any system, topologically trivial or non‐trivial, thus addressing the long‐standing need for comprehensive characterization of the optical response.

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“…For example, the peaks at about 240 meV and 1.6 eV of

Re σ_{x x}

, and the peaks at about 240 meV, 750 meV, and 1.25 eV of

Re σ_{y y}

, respectively, are measured and reported in ref. []. Similarly, our obtained peaks at 100 meV of

Re σ_{x x}

and at 750 meV of

Re σ_{y y}

agree with those from the recent report on bulk

{MoTe}_{2}

.…”

Section: Resultssupporting

confidence: 92%

{WTe}_{2}

. For example, the peaks at about 240 meV and 1.6 eV of

Re σ_{x x}

, and the peaks at about 240 meV, 750 meV, and 1.25 eV of

Re σ_{y y}

, respectively, are measured and reported in ref.…”

Section: Resultssupporting

confidence: 89%

“…There are a limited number of experimental studies reporting measurements for the optical properties of

{WTe}_{2}

. These results show an overall approximately linear increase in the optical conductivity with frequency and they are analyzed in terms of a Drude model with two types of carriers.…”

Section: Resultsmentioning

confidence: 99%

T_{d}

{MoTe}_{2}

, to our knowledge there is only one very recent report on its optical spectrum .…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions

Popescu

Pertsova

Balatsky

et al. 2020

Advcd Theory and Sims

View full text Add to dashboard Cite

show abstract

“…The distance between adjacent W atoms along the a ‐axis is much smaller than that along the b ‐axis, leading to the anisotropic in‐plane electronic structure. The optical properties in the ab plane are studied by the reflection measurements of single crystals . As shown in Figure c, the derived dielectric function is highly anisotropic along the two principle axes, which are composed of anisotropic intraband transitions (low energy components) and interband transitions.…”

Section: Plasmons In Anisotropic 2d Materialsmentioning

confidence: 99%

The Optical Properties and Plasmonics of Anisotropic 2D Materials

Wang

Zhang

Huang

et al. 2019

Advanced Optical Materials

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In the fast growing 2D materials family, anisotropic 2D materials, with their intrinsic in‐plane anisotropy, exhibit a great potential in optoelectronics. One such typical material is black phosphorus (BP), with a layer‐dependent and highly tunable bandgap. Such intrinsic anisotropy adds a new degree of freedom to the excitation, detection, and control of light. Particularly, hyperbolic plasmons with hyperbolic q‐space dispersion are predicted to exist in BP films, where highly directional propagating polaritons with divergent densities of states are hosted. Combined with a tunable electronic structure, such natural hyperbolic surfaces may enable a series of exotic applications in nanophotonics. Herein, the anisotropic optical properties and plasmons (especially hyperbolic plasmons) of BP are discussed. In addition, other possible 2D material candidates (especially anisotropic layered semimetals) for hyperbolic plasmons are examined. This review may stimulate further research interest in anisotropic 2D materials and fully unleash their potential in flatland photonics.

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Anisotropic Broadband Photoresponse of Layered Type‐II Weyl Semimetal MoTe₂

et al. 2018

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Photodetectors based on Weyl semimetal promise extreme performance in terms of highly sensitive, broadband and self-powered operation owing to its extraordinary material properties. Layered Type-II Weyl semimetal that break Lorentz invariance can be further integrated with other two-dimensional materials to form van der Waals heterostructures and realize multiple functionalities inheriting the advantages of other two-dimensional materials. Herein, we report the realization of a broadband self-powered photodetector based on Type-II Weyl semimetal T -MoTe . The prototype metal-MoTe -metal photodetector exhibits a responsivity of 0.40 mA W and specific directivity of 1.07 × 10 Jones with 43 μs response time at 532 nm. Broadband responses from 532 nm to 10.6 μm are experimentally tested with a potential detection range extendable to far-infrared and terahertz. Furthermore, we identify the response of the detector is polarization angle sensitive due to the anisotropic response of MoTe . The anisotropy is found to be wavelength dependent, and the degree of anisotropy increases as the excitation wavelength gets closer to the Weyl nodes. In addition, with power and temperature dependent photoresponse measurements, the photocurrent generation mechanisms are investigated. Our results suggest this emerging class of materials can be harnessed for broadband angle sensitive, self-powered photodetection with decent responsivities.

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Anisotropic electrodynamics of type-II Weyl semimetal candidate WTe2

Cited by 82 publications

References 48 publications

Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions

Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions

The Optical Properties and Plasmonics of Anisotropic 2D Materials

Anisotropic Broadband Photoresponse of Layered Type‐II Weyl Semimetal MoTe₂

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Anisotropic electrodynamics of type-II Weyl semimetal candidate WTe2

Cited by 82 publications

References 48 publications

Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions

Optical Response of MoTe2 and WTe2 Weyl Semimetals: Distinguishing between Bulk and Surface Contributions

The Optical Properties and Plasmonics of Anisotropic 2D Materials

Anisotropic Broadband Photoresponse of Layered Type‐II Weyl Semimetal MoTe2

Contact Info

Product

Resources

About

Anisotropic Broadband Photoresponse of Layered Type‐II Weyl Semimetal MoTe₂