WTe2 (Tungsten Ditelluride)

WTe2 Tungsten Ditelluride WTe2 is a semi-metal, type II Weyl semimetal (WSM). The layers are stacked together via van der Waals interactions and can be exfoliated into thin 2D layers. Tungsten Ditelluride belongs to the group-VI transition metal dichalcogenides (TMDC). To buy WTe2 crystals please click here.

The WTe2 crystals produced at HQ Graphene have a typical lateral size of ~0.6-0.8 cm, needle/rechtangular shaped and have a metallic appearance. We produce n-type WTe2, having a typical charge carrier density of ~1020cm-3 at room temperature. A selection of peer review publications on the WTe2 we sell can be found below.


WTe2 crystal properties
Crystal size ~10 mm
Electrical properties Semimetal, type II Weyl semimetal (WSM)
Crystal structure Orthorhombic P
Unit cell parameters a = 0.348 nm, b = 0.625 nm, c = 1.405 nm, α = β = γ = 90°
Type Synthetic
Purity >99.995 %
Characterized by XRD, Raman, EDX, Hall measurement
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The single crystal WTe2 is characterized using:

XRD: single crystal and powder X-ray diffraction (D8 Venture Bruker and D8 Advance Bruker)
EDX: Stoichiometric analysis
Raman: 785nm Raman system
Hall measurement: Extraction of charge carrier density and doping in the Van der Pauw geometry.

Raman, XRD and EDX on WTe2:

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X-ray diffraction on a WTe2 single crystal aligned along the (001) plane. XRD was performed at room temperature using a D8 Venture Bruker. The 5 XRD peaks correspond, from left to right, to (00l) with l = 2, 4, 6, 8, 10

Powder X-ray diffraction (XRD) of a single crystal WTe2. X-ray diffraction was performed at room temperature using a D8 Venture Bruker.

Stoichiometric analysis of a single crystal WTe2 by Energy-dispersive X-ray spectroscopy (EDX).

Raman spectrum of a single crystal WTe2. Measurement was performed with a 785 nm Raman system at room temperature.





HQ Graphene Wiki on:

WTe2 (Tungsten Ditelluride)


1. Yaojia Wang et al., "Gate-tunable negative longitudinal magnetoresistance in the predicted type-II Weyl semimetal WTe2", Nat. Comm. 7:13142 (2016), link to article ( also available at arxiv.org/abs/1608.05003) :
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5062597/

2. D. MacNeill et al., "Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers", Nature Physics (2016) doi:10.1038/nphys3933, link to article (also available at arxiv.org/ftp/arxiv/papers/1605/1605.02712.pdf):
http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3933.html

3. L.R. Thoutam et al., "Temperature-Dependent Three-Dimensional Anisotropy of the Magnetoresistance in WTe2 ", PRL 115, 046602 (2015), link to article:
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.046602

Company

HQ Graphene is a company registered in The Netherlands, Europe under the number KVK 59652233.

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