2021
DOI: 10.1103/physrevlett.126.227402
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Observation of Negative Terahertz Photoconductivity in Large Area Type-II Dirac Semimetal PtTe2

Abstract: As a newly emergent type-II Dirac semimetal, Platinum Telluride (PtTe 2 ) stands out from other 2D noble-transition-metal dichalcogenides for the unique structure and novel physical properties, such as high carrier mobility, strong electron-phonon coupling and tunable bandgap, which make the PtTe 2 a good candidate for applications in optoelectronics, valleytronics and far infrared detectors. Although the transport properties of PtTe 2 have been studied extensively, the dynamics of the nonequilibrium carriers … Show more

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Cited by 46 publications
(28 citation statements)
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“…In the meanwhile, type‐II DSM PtTe 2 allows a novel undamped surface plasmon resonance mode in THz region since the presence of electron and hole pockets near the Fermi surface 43 . And, the PtTe 2 also exhibits the transient THz transmission caused by the carriers cooling and the formation of small polaron, which makes PtTe 2 with enhanced absorption and fast response capability for THz band 44 . These unique energy band structure and topologically protected nontrivial electronic properties of PtTe 2 endow it with unique superiority for THz bands detection 40,45 …”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…In the meanwhile, type‐II DSM PtTe 2 allows a novel undamped surface plasmon resonance mode in THz region since the presence of electron and hole pockets near the Fermi surface 43 . And, the PtTe 2 also exhibits the transient THz transmission caused by the carriers cooling and the formation of small polaron, which makes PtTe 2 with enhanced absorption and fast response capability for THz band 44 . These unique energy band structure and topologically protected nontrivial electronic properties of PtTe 2 endow it with unique superiority for THz bands detection 40,45 …”
Section: Introductionmentioning
confidence: 99%
“…43 And, the PtTe 2 also exhibits the transient THz transmission caused by the carriers cooling and the formation of small polaron, which makes PtTe 2 with enhanced absorption and fast response capability for THz band. 44 These unique energy band structure and topologically protected nontrivial electronic properties of PtTe 2 endow it with unique superiority for THz bands detection. 40,45 However, the present PtTe 2 THz PDs mainly rely on mechanically exfoliated nanosheets and chemical vapor deposition (CVD) grown nanoflakes, 40,45 which are of high quality and suitable for fundamental research, but the resulting small size and uncontrollable thickness prevent its large-scale THz applications in industry.…”
Section: Introductionmentioning
confidence: 99%
“…One needs to find the material with high carrier mobility, short carrier relaxation time, and significant surface conductivity for the modulator [26,27]. As novel transition metal dichalcogenide (TMDCs) materials, PtSe 2 and its parental compounds such as PtTe 2 , PdTe 2 , and NiTe 2 have been widely studied by researchers for their unique energy band structure and novel physical properties [28][29][30][31]. However, PtSe 2 stands out due to its unique properties of having high carrier mobility, an adjustable band gap of 0-1.2 eV, and fast response characteristics [32][33][34].…”
Section: Introductionmentioning
confidence: 99%
“…Thus, a material referred to as “3D graphene”, a Dirac semimetal, has attracted significant research attention. 26–28 Dirac semimetals exhibit excellent electromagnetic properties in the THz band and have been applied to tunable metamaterial absorbers, 29,30 plasmon-induced transparency, 31,32 asymmetric transmission, 33,34 polarization converters, 35,36 and dynamic BIC metasurfaces. 37,38 Thus, Dirac semimetals can serve as a basis for the realization of dynamically tunable BIC metasurfaces in the THz band.…”
Section: Introductionmentioning
confidence: 99%