The study on quantum material WTe<sub>2</sub>

Pan, Xiaoxue; Wang, Xuefeng; Song, Fengqi; Wang, Baigeng

doi:10.1080/23746149.2018.1468279

Cited by 14 publications

(11 citation statements)

References 88 publications

(139 reference statements)

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“…Our calculation confirms that the laser is able to open the gap in WTe 2 . The upper panel in Figure shows the ground state band structure calculated by ab initio software Nanodcal which agrees well with the published results . We do not consider spin‐orbit interaction here because its effect to band structure is negligible for the purpose of the present study.…”

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confidence: 85%

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Anomalous and Polarization‐Sensitive Photoresponse of T_d‐WTe₂ from Visible to Infrared Light

et al. 2018

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Recently, an emergent layered material T d -WTe 2 was explored for its novel electron-hole overlapping band structure and anisotropic inplane crystal structure. Here, the photoresponse of mechanically exfoliated WTe 2 flakes is investigated. A large anomalous current decrease for visible (514.5 nm), and mid-and far-infrared (3.8 and 10.6 µm) laser irradiation is observed, which can be attributed to light-induced surface bandgap opening from the first-principles calculations. The photocurrent and responsivity can be as large as 40 µA and 250 A W −1 for a 3.8 µm laser at 77 K. Furthermore, the WTe 2 anomalous photocurrent matches its in-plane crystal structure and exhibits light polarization dependence, maximal for linear laser polarization along the W atom chain a direction and minimal for the perpendicular b direction, with the anisotropic ratio of 4.9. Consistently, first-principles calculations confirm the angle-dependent bandgap opening of WTe 2 under polarized light irradiation. The anomalous and polarization-sensitive photoresponses suggest that linearly polarized light can significantly tune the WTe 2 surface electronic structure, providing a potential approach to detect polarized and broadband lights up to far infrared range.

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confidence: 85%

“…In particular, WTe 2 has also been theoretically predicted to be the first type‐II Weyl semimetal and attracted increasing attention as reviewed in ref. .…”

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confidence: 99%

Anomalous and Polarization‐Sensitive Photoresponse of T_d‐WTe₂ from Visible to Infrared Light

et al. 2018

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“…The presence of tilted Weyl cones and of low energy excitations violating the Lorentz invariance in the vicinity of the Weyl points were predicted for the electronic band structure of WTe 2 , a transition metal dichalcogenide (TMDC) semimetal with layered van der Waals structure [21,22]. In addition to the presence of the Fermi arc at the Fermi surface [23][24][25], anisotropic transport properties including extreme transverse magnetoresistance and the anisotropic ABJ anomaly, are reported for both bulk and few layers WTe 2 flakes [15,[26][27][28][29][30][31][32][33][34][35][36]. The tilted Weyl cone was also observed in the TMDC semimetal MoTe 2 [37,38] and in LaAlGe [39].…”

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confidence: 95%

Positive Magnetoresistance and Chiral Anomaly in Exfoliated Type-II Weyl Semimetal Td-WTe2

Adhikari

Faina

et al. 2021

Nanomaterials

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Layered van der Waals semimetallic Td-WTe2, exhibiting intriguing properties which include non-saturating extreme positive magnetoresistance (MR) and tunable chiral anomaly, has emerged as a model topological type-II Weyl semimetal system. Here, ∼45 nm thick mechanically exfoliated flakes of Td-WTe2 are studied via atomic force microscopy, Raman spectroscopy, low-T/high-μ0H magnetotransport measurements and optical reflectivity. The contribution of anisotropy of the Fermi liquid state to the origin of the large positive transverse MR⊥ and the signature of chiral anomaly of the type-II Weyl Fermions are reported. The samples are found to be stable in air and no oxidation or degradation of the electronic properties is observed. A transverse MR⊥∼1200 % and an average carrier mobility of 5000 cm2V−1s−1 at T=5K for an applied perpendicular field μ0H⊥=7T are established. The system follows a Fermi liquid model for T≤50K and the anisotropy of the Fermi surface is concluded to be at the origin of the observed positive MR. Optical reflectivity measurements confirm the anisotropy of the electronic behaviour. The relative orientation of the crystal axes and of the applied electric and magnetic fields is proven to determine the observed chiral anomaly in the in-plane magnetotransport. The observed chiral anomaly in the WTe2 flakes is found to persist up to T=120K, a temperature at least four times higher than the ones reported to date.

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“…Tungsten ditelluride (WTe 2 ) is one of the most prominent layered transition metal dichalcogenide (TMD) materials, with diverse and complex physical properties, providing many unexplored research directions in both fundamental and applied materials science [ 1 , 2 , 3 ]. These are related to its unique type-II Weyl fermion nature; it is a topological semimetal in which both edge and 2D bulk metallic states exist, with the potential to be modified in a 2D topological insulator using various control options such as temperature, magnetic, electric and optical fields, pressure and strain, electrostatic gating and bias voltages [ 4 , 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Optical Response of WTe2 Single Crystals Studied by Ellipsometric Analysis

et al. 2021

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In this paper we report the crystal growth conditions and optical anisotropy properties of Tungsten ditelluride (WTe2) single crystals. The chemical vapor transport (CVT) method was used for the synthesis of large WTe2 crystals with high crystallinity and surface quality. These were structurally and morphologically characterized by means of X-ray diffraction, optical profilometry and Raman spectroscopy. Through spectroscopic ellipsometry analysis, based on the Tauc–Lorentz model, we identified a high refractive index value (~4) and distinct tri-axial anisotropic behavior of the optical constants, which opens prospects for surface plasmon activity, revealed by the dielectric function. The anisotropic physical nature of WTe2 shows practical potential for low-loss light modulation at the 2D nanoscale level.

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The study on quantum material WTe₂

Abstract: WTe 2 and its sister alloys have attracted tremendous attention in recent years due to the large non-saturating magnetoresistance and topological non-trivial properties. Herein, we briefly review the electrical property studies on this new quantum material.

Cited by 14 publications

References 88 publications

Anomalous and Polarization‐Sensitive Photoresponse of T_d‐WTe₂ from Visible to Infrared Light

Anomalous and Polarization‐Sensitive Photoresponse of T_d‐WTe₂ from Visible to Infrared Light

Positive Magnetoresistance and Chiral Anomaly in Exfoliated Type-II Weyl Semimetal Td-WTe2

Anisotropic Optical Response of WTe2 Single Crystals Studied by Ellipsometric Analysis

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The study on quantum material WTe2

Abstract: WTe 2 and its sister alloys have attracted tremendous attention in recent years due to the large non-saturating magnetoresistance and topological non-trivial properties. Herein, we briefly review the electrical property studies on this new quantum material.

Cited by 14 publications

References 88 publications

Anomalous and Polarization‐Sensitive Photoresponse of Td‐WTe2 from Visible to Infrared Light

Anomalous and Polarization‐Sensitive Photoresponse of Td‐WTe2 from Visible to Infrared Light

Positive Magnetoresistance and Chiral Anomaly in Exfoliated Type-II Weyl Semimetal Td-WTe2

Anisotropic Optical Response of WTe2 Single Crystals Studied by Ellipsometric Analysis

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The study on quantum material WTe₂

Anomalous and Polarization‐Sensitive Photoresponse of T_d‐WTe₂ from Visible to Infrared Light

Anomalous and Polarization‐Sensitive Photoresponse of T_d‐WTe₂ from Visible to Infrared Light