Carrier heating and negative photoconductivity in graphene

Heyman, James; Stein, J. D.; Kaminski, Z. S.; Andrew, Banman,; Massari, Aaron M.; Robinson, Jeremy T.

doi:10.1063/1.4905192

Cited by 30 publications

(21 citation statements)

References 30 publications

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“…The observation of such a large and positive photoconductivity would be highly unconventional for a metal, which generally exhibits photoconductivities of less than 1% (refs. [24][25][26] ) and which are often negative 27 , especially when excitation is performed in the mid-infrared and far away from inter-band transitions. Rather, the combined observation of a vanishingly small resistance with the transient terahertz optical spectra shown in Fig.…”

Section: Evidence For Metastable Photo-inducedmentioning

confidence: 99%

Evidence for metastable photo-induced superconductivity in K3C60

et al. 2021

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Excitation of high-Tc cuprates and certain organic superconductors with intense far-infrared optical pulses has been shown to create non-equilibrium states with optical properties that are consistent with transient high-temperature superconductivity. These non-equilibrium phases have been generated using femtosecond drives, and have been observed to disappear immediately after excitation, which is evidence of states that lack intrinsic rigidity. Here we make use of a new optical device to drive metallic K3C60 with mid-infrared pulses of tunable duration, ranging between one picosecond and one nanosecond. The same superconducting-like optical properties observed over short time windows for femtosecond excitation are shown here to become metastable under sustained optical driving, with lifetimes in excess of ten nanoseconds. Direct electrical probing, which becomes possible at these timescales, yields a vanishingly small resistance with the same relaxation time as that estimated by terahertz conductivity. We provide a theoretical description of the dynamics after excitation, and justify the observed slow relaxation by considering randomization of the order-parameter phase as the rate-limiting process that determines the decay of the light-induced superconductor.

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Section: Evidence For Metastable Photo-inducedmentioning

confidence: 99%

Evidence for metastable photo-induced superconductivity in K3C60

et al. 2021

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“…In the case of the dominant long-range scattering, the G-layer conductivity rises with increasing carrier effective temperature [15]. In the model [18], the G-layer conductivity was considered assuming that τ p = τ 0 is independent of carrier momentum p. In such a model, One can see that at τ p = const, as in the case τ p ∝ 1/p considered by us, the G-layer conductivity decreases with increasing carrier temperature. However, this effect vanishes (the conductivity becomes insensitive to the carrier temperature variation and, hence, to the irradiation) when the Auger parameter η tends to zero.…”

Section: Discussionmentioning

confidence: 99%

“…where J 0 H is the net source-drain dc current Equations (18) and (24) for relatively low frequenciesΩ yield…”

Section: Detectivity Of the Gp-bolometersmentioning

confidence: 99%

Negative photoconductivity and hot-carrier bolometric detection of terahertz radiation in graphene-phosphorene hybrid structures

Ryzhii

Пономарев

et al. 2019

Journal of Applied Physics

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We consider the effect of terahertz (THz) radiation on the conductivity of the ungated and gated graphene (G)-phosphorene (P) hybrid structures and propose and evaluated the hotcarrier uncooled bolometric photodetectors based on the GP-lateral diodes (GP-LDs) and GP-field-effect transistors (GP-FETs) with the GP channel. The operation of the GP-LDs and GP-FET photodetectors is associated with the carrier heating by the incident radiation absorbed in the G-layer due to the intraband transitions. The carrier heating leads to the relocation of a significant fraction of the carriers into the P-layer. Due to a relatively low mobility of the carriers in the P-layer, their main role is associated with a substantial reinforcement of the scattering of the carriers. The GP-FET bolometric photodetector characteristics are effectively controlled by the gate voltage. A strong negative conductivity of the GP-channel can provide much higher responsivity of the THz hot-carriers GP-LD and GP-FET bolometric photodetectors in comparison with the bolometers with solely the G-channels.

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“…Há alguns materiais com resposta fotocondutiva negativa, fato experimental observado e ainda não muito bem compreendido teoricamente [59][60][61], e também materiais com efeitos combinados de ordem magnética e fotocondutividade [62].…”

Section: O Fenômeno Da Fotocondutividadeunclassified

Uma revisão dos princípios da conversão fotovoltaica de energia

Lima

Menezes

Santos

et al. 2020

Rev. Bras. Ensino Fís.

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Resumo A conversão fotovoltaica de energia é uma área de pesquisa muito ativa devido à necessidade de ampliar a participação das fontes de energia renováveis na matriz energética global. Os esforços de pesquisa vão desde a modelagem de dispositivos fotovoltaicos a partir de princípios físicos fundamentais ou fenomenologias, passando pelo desenvolvimento e caracterização de novos materiais e dispositivos aplicáveis na conversão fotovoltaica e indo até os estudos de impacto ambiental e aspectos econômicos. No presente trabalho, utilizando-se do modelo de sistema de dois níveis acoplado a um campo de fótons, apresentam-se os princípios físicos da conversão fotovoltaica de energia. Com isso, além de servir de rápido guia para os pesquisadores e estudantes no campo da conversão fotovoltaica, o problema spin-bóson é utilizado de forma pedagógica para servir como um exercício contextualizado de mecânica quântica e física dos semicondutores.

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Carrier heating and negative photoconductivity in graphene

Cited by 30 publications

References 30 publications

Evidence for metastable photo-induced superconductivity in K3C60

Evidence for metastable photo-induced superconductivity in K3C60

Negative photoconductivity and hot-carrier bolometric detection of terahertz radiation in graphene-phosphorene hybrid structures

Uma revisão dos princípios da conversão fotovoltaica de energia

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