Anisotropic electronic, mechanical, and optical properties of monolayer WTe2

Torun, Engin; Şahin, Hasan; Cahangirov, Seymur; Rubio, Ángel; Peeters, F. M.

doi:10.1063/1.4942162

Cited by 87 publications

(60 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is seen that the charge neutrality point of the graphene/WTe 2 hybrid device, upon light irradiation, shifts to a larger positive voltage, unambiguously indicating a hole-doped effect of graphene (or photogenerated electrons transfer from graphene to WTe 2 ). Such a shift in transfer curve is compatible with the previously discussed Fermi level pinning effect, when considering the work function for graphene and WTe 2 are 4.5 eV and 4.39 eV, respectively 30 , 39 . It should be noted that the rather small work function mismatch (~0.1 eV) would lead to a built-in field that is weak and easily screened by impurity at the interface.…”

Section: Resultssupporting

confidence: 89%

Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2

Liu

Wang

et al. 2018

Sci Rep

View full text Add to dashboard Cite

Heterostructures based on two-dimensional (2D) materials have sparked wide interests in both fundamental physics and applied devices. Recently, Dirac/Weyl semimetals are emerging as capable functional materials for optoelectronic devices. However, thus far the interfacial coupling of an all-semimetal 2D heterostructure has not been investigated, and its effects on optoelectronic properties remain less well understood. Here, a heterostructure comprising of all semi-metallic constituents, namely graphene and WTe2, is fabricated. Standard photocurrent measurements on a graphene/WTe2 phototransistor reveal a pronounced photocurrent enhancement (a photoresponsivity ~8.7 A/W under 650 nm laser illumination). Transport and photocurrent mapping suggest that both photovoltaic and photothermoelectric effects contribute to the enhanced photoresponse of the hybrid system. Our results help to enrich the understanding of new and emerging device concepts based on 2D layered materials.

show abstract

Section: Resultssupporting

confidence: 89%

Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2

Liu

Wang

et al. 2018

Sci Rep

View full text Add to dashboard Cite

show abstract

“…First, the cohesive energy of h-InC is calculated as -3.91 eV per atom. This value is comparable to those of known 2D materials, such as silicene (-3.96 eV), germanene (-2.6 eV) 102 , as well as existing monolayer transition metal dichalcogenides, including MoTe 2 and WSe 2 (-4 ∼ -6 eV) [103][104][105][106][107] . Moreover, the h-InC lattice forms a local minimum in atomic configuration space as shown in the total energy curve in Fig.…”

Section: Resultssupporting

confidence: 78%

Ferromagnetic nodal-line metal in monolayer h -InC

Jeon

Kim

2019

Phys. Rev. B

View full text Add to dashboard Cite

Based on first-principles calculations, we predict a new two-dimensional ferromagnetic material that exhibits exotic Fermi surface topology. We show that monolayer hexagonal indium carbide (h-InC) is thermodynamically and dynamically stable, and it energetically favors the ferromagnetic ordering of spins. The perfectly planar geometry in two dimensions, together with ferromagnetism, gives rise to a unique opportunity to encounter intriguing electronic properties, captured in the Fermi surface and band topology. We show that multiple nodal lines coexist in momentum space, accompanied by the electron and hole pockets that touch each other linearly at the nodal lines. Inclusion of spin-orbit coupling enriches the magnetic and electronic properties of h-InC. Spin-orbit coupling leads to an easy-plane type magnetocrystalline anisotropy, and the nodal lines can be tuned into topological nodal points, contingent upon the magnetization direction. Symmetry analysis and a tight-binding model are provided to explain the nodal structure of the bands. Our findings suggest h-InC as a new venue for supporting carbon-based magnetism and exotic band topology in two dimensions.

show abstract

“…The ARPOM was developed to imaging the grain boundary and identify the lattice orientation of as‐synthesized multidomain 1T′ MoTe 2 films with nondestructive and fast. Our findings not only provide a convenient and undamaged approach to imaging and identify the crystal structure of anisotropic 2D materials simply by ARPOM but also will encourage other groups to take the study of the anisotropic optical properties for those 2D semimetal materials, such as WTe 2 , TaS 2 , NbSe 2 , and VSe 2 …”

Section: Resultsmentioning

confidence: 83%

Linear Dichroism and Nondestructive Crystalline Identification of Anisotropic Semimetal Few‐Layer MoTe₂

Zhu

Zhao

Feng

et al. 2019

Small

View full text Add to dashboard Cite

Semimetal 1T′ MoTe2 crystals have attracted tremendous attention owing to their anisotropic optical properties, Weyl semimetal, phase transition, and so on. However, the complex refractive indices (n‐ik) of the anisotropic semimetal 1T′ MoTe2 still are not revealed yet, which is important to applications such as polarized wide spectrum detectors, polarized surface plasmonics, and nonlinear optics. Here, the linear dichroism of as‐grown trilayer 1T′ MoTe2 single crystals is investigated. Trilayer 1T′ MoTe2 shows obvious anisotropic optical absorption due to the intraband transition of dz2 orbits for Mo atoms and px orbits for Te atoms. The anisotropic complex refractive indices of few‐layer 1T′ MoTe2 are experimentally obtained for the first time by using the Pinier equation analysis. Based on the linear dichroism of 1T′ MoTe2, angle‐resolved polarized optical microscopy is developed to visualize the grain boundary and identify the crystal orientation of 1T′ MoTe2 crystals, which is also an excellent tool toward the investigation of the optical absorption properties in the visible range for anisotropic 2D transition metal chalcogenides. This work provides a universal and nondestructive method to identify the crystal orientation of anisotropic 2D materials, which opens up an opportunity to investigate the optical application of anisotropic semimetal 2D materials.

show abstract

Anisotropic electronic, mechanical, and optical properties of monolayer WTe2

Cited by 87 publications

References 39 publications

Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2

Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2

Ferromagnetic nodal-line metal in monolayer h -InC

Linear Dichroism and Nondestructive Crystalline Identification of Anisotropic Semimetal Few‐Layer MoTe₂

Contact Info

Product

Resources

About

Anisotropic electronic, mechanical, and optical properties of monolayer WTe2

Cited by 87 publications

References 39 publications

Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2

Photoresponsivity of an all-semimetal heterostructure based on graphene and WTe2

Ferromagnetic nodal-line metal in monolayer h -InC

Linear Dichroism and Nondestructive Crystalline Identification of Anisotropic Semimetal Few‐Layer MoTe2

Contact Info

Product

Resources

About

Linear Dichroism and Nondestructive Crystalline Identification of Anisotropic Semimetal Few‐Layer MoTe₂