Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CoTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Chakraborty, Atasi; Fujii, Jun; Kuo, C. N.; Lue, Chin Shan; Politano, Antonio; Vobornik, I.; Agarwal, Amit

doi:10.1103/physrevb.107.085406

Cited by 7 publications

(16 citation statements)

References 52 publications

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“…CoTe 2 nanosheets are also a topological semimetal that supports type II Dirac crossovers near the Fermi energy. 28 This means that CoTe 2 nanosheets are similar to graphene, which gives it a high carrier mobility and a wide operating band. 12 This is a rare property and only a few TMDs (e.g., PdTe 2 , NiTe 2 ) have this property.…”

Section: Introductionmentioning

confidence: 99%

“…29,30 CoTe 2 nanosheets also host several topological band inversions, which means that it can produce stepped spinpolarized surface states over a wide energy range. 28 Because CoTe 2 nanosheets have metallic properties, it also has excellent thickness-adjustable conductivity and excellent breakdown current density. 31,32 CoTe 2 nanosheets have applications in a variety of fields.…”

Section: Introductionmentioning

confidence: 99%

“…CoTe 2 nanosheets are a promising 2D semiconductor contact material as a transition metal dichalcogenides (TMD) with strong photon absorption and exciton generation. CoTe 2 nanosheets are also a topological semimetal that supports type II Dirac crossovers near the Fermi energy . This means that CoTe 2 nanosheets are similar to graphene, which gives it a high carrier mobility and a wide operating band .…”

Section: Introductionmentioning

confidence: 99%

“…This means that CoTe 2 nanosheets are similar to graphene, which gives it a high carrier mobility and a wide operating band . This is a rare property and only a few TMDs (e.g., PdTe 2 , NiTe 2 ) have this property. , CoTe 2 nanosheets also host several topological band inversions, which means that it can produce stepped spin-polarized surface states over a wide energy range . Because CoTe 2 nanosheets have metallic properties, it also has excellent thickness-adjustable conductivity and excellent breakdown current density. , CoTe 2 nanosheets have applications in a variety of fields.…”

Section: Introductionmentioning

confidence: 99%

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Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe₂ Nanosheets as Saturable Absorbers for Ultrafast Photonics

Li,

Xiong,

Sheng

et al. 2024

ACS Appl. Nano Mater.

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In this paper, we report the use of CoTe 2 nanosheet polyvinyl alcohol composites as saturable absorbers for pulse generation in erbium-doped fiber lasers. The saturable absorption characteristics of CoTe 2 nanosheets have been investigated, and their modulation depth and saturation intensity are 3.64% and 1.25 MW/cm 2 , respectively. By controlling the pump power and polarization controller, conversion from dark−bright−dark pulses to h-shaped pulse rains can be achieved in the laser. This modelocked state transition occurs because the nonlinear effect of the saturable absorber increases as the pump power increases. This is the first time that mode-locked operation in the 1.5 μm range has been achieved in a fiber laser using a CoTe 2 nanosheet-based saturable absorber, and the first time that h-shaped pulse rains have been generated by using a real saturable absorber. Our experimental results show that CoTe 2 nanosheets have great potential for application in ultrafast photonics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe₂ Nanosheets as Saturable Absorbers for Ultrafast Photonics

Li,

Xiong,

Sheng

et al. 2024

ACS Appl. Nano Mater.

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“…[10,11,12,13] Among various fantastic candidates, cobalt telluride (Co x Te y ) widely reputed as star catalysts for hydrogen/oxygen evolution reactions, [14,15] water splitting, [16] photo-/electro-catalytic chemistry, [17,18,19] and even energy storage devices, [20,21] was re-recognized with tunable ferromagnetism and paramagnetism and is potential for memory and spintronic devices. [22,23,24,25] Differentiating from traditional vdW magnets, the stoichiometric ratio of Co and Te varies from (1+𝛿):1 to 1:2 and the variation of crystal structure effectively modulates the band structure of Co x Te y from type-II Dirac semimetallic (1T-CoTe 2 ) to semiconducting (bandgap ≈2.5 eV, CoTe). [26,27,28] This extra degree of freedom enables Co x Te y taking centerstage for exploring spin fluctuation and other new physical paradigms.…”

Section: Introductionmentioning

confidence: 99%

Emerging 2D Cobalt Telluride (Co_xTe_y): from Theory to Applications

Liu,

Gong,

Yin

et al. 2023

Adv Funct Materials

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Cobalt telluride, with tunable magnetism and ferromagnetism that hinged upon the stoichiometric ratio, has emerged as a new member of 2D materials in the last decade. Metallic doping by sodium (Na) and platinum (Pt) atoms below critical concentrations is found to enhance the magnetism of cobalt telluride. After thinning cobalt telluride down to few‐layer, the saturation magnetism is improved by two order of magnitudes because of the oxidation state of cobalt (Co) and reduced coordination number of the surface atoms. In 2D limit, cobalt di‐telluride possesses Dirac band structure with many nodal lines that correlate with quantum criticality and other fantastic physics. In this mini‐review, the crystal and band structures of cobalt telluride categorized by stoichiometric ratio are overviewed after briefing the introduction. Both top‐down and bottom‐up methods are then discussed to offer optimum solutions for each specified application scenario. Afterward, emerging magnetic and electronic properties and credit enhancements are launched accompanied with their key advances. Beyond these, the faced challenges and possible directions of future research are also provided, attempting to boost both fundamental physics and device applications based on 2D cobalt telluride.

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Spontaneous Line Defect‐Induced Co₄Te₇ Superlattices on SrTiO₃(001) Featuring Flat Bands

Quan,

Lu,

et al. 2024

Adv Funct Materials

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Abstract1D structures/patterns (e.g., line defect arrays, 1D Moiré patterns) embedded in 2D materials provide fascinating platforms for exploring versatile intriguing phenomena, for example, 1D Luttinger liquids and charge density waves (CDWs). Despite persistent efforts, incorporating periodic 1D patterns into 2D materials remains an ongoing pursuit. Herein, the direct preparation of monolayer 1D‐defect‐induced Co4Te7 superlattices (with periodic Te defect lines in the upper Te layer in 1T‐CoTe2) is reported, on lattice‐matched SrTiO3(001) (STO(001)) substrates via molecular beam epitaxy (MBE). Utilizing on‐site scanning tunneling microscopy/spectroscopy (STM/STS) combined with density functional theory (DFT) calculations, the detailed atomic structure of monolayer Co4Te7 is identified, and its formation mechanisms from the synergistic effects of the Co/Te precursor ratio and adlayer‐substrate interfacial coupling are uncovered. The potential flat‐band feature of the monolayer Co4Te7 is also unveiled. This work should hereby offer valuable insights into the engineering of periodic 1D‐defect patterns in 2D materials, as well as the atomic‐scale structure and electronic property characterizations, thus paving ways for their intriguing property investigations.

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Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2

Cited by 7 publications

References 52 publications

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe₂ Nanosheets as Saturable Absorbers for Ultrafast Photonics

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe₂ Nanosheets as Saturable Absorbers for Ultrafast Photonics

Emerging 2D Cobalt Telluride (Co_xTe_y): from Theory to Applications

Spontaneous Line Defect‐Induced Co₄Te₇ Superlattices on SrTiO₃(001) Featuring Flat Bands

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Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2

Cited by 7 publications

References 52 publications

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe2 Nanosheets as Saturable Absorbers for Ultrafast Photonics

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe2 Nanosheets as Saturable Absorbers for Ultrafast Photonics

Emerging 2D Cobalt Telluride (CoxTey): from Theory to Applications

Spontaneous Line Defect‐Induced Co4Te7 Superlattices on SrTiO3(001) Featuring Flat Bands

Contact Info

Product

Resources

About

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe₂ Nanosheets as Saturable Absorbers for Ultrafast Photonics

Generation of Bright Pulses, Dark–Bright–Dark Pulses, and H-Shaped Pulse Rains in Fiber Lasers with CoTe₂ Nanosheets as Saturable Absorbers for Ultrafast Photonics

Emerging 2D Cobalt Telluride (Co_xTe_y): from Theory to Applications

Spontaneous Line Defect‐Induced Co₄Te₇ Superlattices on SrTiO₃(001) Featuring Flat Bands