High sensitivity and anisotropic broadband photoresponse of T-WTe2

Xu, Zhong-Hui; Luo, Bingfeng; Chen, Yan; Li, Xiaobo; Chen, Zhe; Yuan, Qiuming; Xiao, Xunwen

doi:10.1016/j.physleta.2020.127093

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…WTe 2 , a recently popular player in two-dimensional (2D) materials with low-symmetry lattice structures, has exhibited outstanding functional device applications [ 11 , 12 ] based on its heavy atomic mass, low-energy optical absorption [ 13 ], thickness-dependent anisotropy of Raman modes [ 14 ], and superconductivity properties [ 15 , 16 ]. It has been reported that the conductivity and the photoelectric anisotropy ratio of WTe 2 film are about 10 3 and 300 [ 17 ], respectively, allowing it to be applied to anisotropic electric and photonic devices [ 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Anisotropy of Multi-Layer Tungsten Telluride on Silicon Substrate

Fang

Liu

et al. 2023

Nanomaterials

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WTe2, a low-symmetry transition metal dichalcogenide, has broad prospects in functional device applications due to its excellent physical properties. When WTe2 flake is integrated into practical device structures, its anisotropic thermal transport could be affected greatly by the substrate, which matters a lot to the energy efficiency and functional performance of the device. To investigate the effect of SiO2/Si substrate, we carried out a comparative Raman thermometry study on a 50 nm-thick supported WTe2 flake (with κzigzag = 62.17 W·m−1·K−1 and κarmchair = 32.93 W·m−1·K−1), and a suspended WTe2 flake of similar thickness (with κzigzag = 4.45 W·m−1·K−1, κarmchair = 4.10 W·m−1·K−1). The results show that the thermal anisotropy ratio of supported WTe2 flake (κzigzag/κarmchair ≈ 1.89) is about 1.7 times that of suspended WTe2 flake (κzigzag/κarmchair ≈ 1.09). Based on the low symmetry nature of the WTe2 structure, it is speculated that the factors contributing to thermal conductivity (mechanical properties and anisotropic low-frequency phonons) may have affected the thermal conductivity of WTe2 flake in an uneven manner when supported on a substrate. Our findings could contribute to the 2D anisotropy physics and thermal transport study of functional devices based on WTe2 and other low-symmetry materials, which helps solve the heat dissipation problem and optimize thermal/thermoelectric performance for practical electronic devices.

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Section: Introductionmentioning

confidence: 99%

Improved Thermal Anisotropy of Multi-Layer Tungsten Telluride on Silicon Substrate

Fang

Liu

et al. 2023

Nanomaterials

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“…Due to the perfectly phase-matching mechanism, the conversion efficiency of the second harmonic generated on the inner surface of the crystal is relatively high [10][11][12] . The efficiency of nonlinear Cherenkov doubling frequency and sum frequency conversion generated on the crystal surface have also been enhanced [11][12][13][14][15][16][17][18][19][20][21] . Although second-order nonlinear processes on surfaces and interfaces have been extensively studied, thirdorder nonlinear processes are rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Third-order nonlinear phenomenon generated on the inner surface of bulk lithium niobate crystals with magnesium doping

Wang

et al. 2022

Chin. Opt. Lett.

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When two synchronized laser beams illuminate the inner surface of bulk lithium niobate crystals with magnesium doping (5%/mol MgO:LiNbO 3 ) under the condition of total reflection, semi-degenerate four-wave mixing (FWM) is generated. On this basis, a more sophisticated frequency conversion process on the interface of nonlinear crystal has been researched. The generation mechanism of FWM is associated with the fundamental waves reflected on the inner surface of the nonlinear crystal. Analysis of the phase-matching mechanism confirms that the FWM is radiated by the third-order nonlinear polarized waves, which are stimulated by the third-order nonlinear susceptibility coefficient of the nonlinear crystal. Theoretically calculated and experimentally measured corresponding data have been presented in this article. These results are expected to provide new inspiration for further experimental and theoretical research on frequency conversion in nonlinear crystals.

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High carrier mobility and polarization sensitivity of AlN/Hf2CO2 heterojunction photodetector

Cui,

Gao,

Zhang

et al. 2024

Chinese Journal of Physics

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High sensitivity and anisotropic broadband photoresponse of T-WTe2

Cited by 5 publications

References 43 publications

Improved Thermal Anisotropy of Multi-Layer Tungsten Telluride on Silicon Substrate

Improved Thermal Anisotropy of Multi-Layer Tungsten Telluride on Silicon Substrate

Third-order nonlinear phenomenon generated on the inner surface of bulk lithium niobate crystals with magnesium doping

High carrier mobility and polarization sensitivity of AlN/Hf2CO2 heterojunction photodetector

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