Three modes of the nonstationary holographic current excitation in a gallium oxide crystal

Abstract We report the nonstationary holographic current excitation in a β-Ga2O3 crystal at light wavelength λ=457 nm. The material demonstrates insulating properties and high transparency for a visible light, but this, however, does not prevent the dynamic space-charge grating formation and the holographic current observation for various external electric fields - zero, dc and ac ones. The signal amplitude is measured and analyzed versus the frequency of phase modulation, spatial frequency and electric field value. The main photoelectric parameters such as specific photoconductivity, sensor responsivity and diffusion length of carriers are determined for the blue region of spectrum.

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Nonstationary holographic currents in a β-Ga2O3 crystal at wavelength λ = 457 nm

Journal of Physics Conference Series ◽

10.1088/1742-6596/2103/1/012163 ◽

2021 ◽

Vol 2103 (1) ◽

pp. 012163

Author(s):

M A Bryushinin ◽

I A Sokolov

Keyword(s):

Visible Light ◽

Space Charge ◽

Gallium Oxide ◽

Diffusion Length ◽

Small Difference ◽

Light Wavelength ◽

Transport Parameters ◽

Oxide Crystal ◽

And Diffusion ◽

Pronounced Polarization

Abstract We report the excitation of nonstationary holographic currents in a monoclinic gallium oxide crystal. Although the crystal is almost transparent and insulating for a visible light, the dynamic space-charge gratings are recorded and holographic currents are observed for both the diffusion and drift modes. The anisotropy along the [100] and [010] directions is revealed, namely, there is a small difference in the transport parameters and a pronounced polarization dependence of the signal. The crystal’s photoconductivity, responsivity and diffusion length of electrons are estimated for the light wavelength λ = 457 nm.

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Emulsions in external electric fields

Advances in Colloid and Interface Science ◽

10.1016/j.cis.2021.102455 ◽

2021 ◽

pp. 102455

Author(s):

Johan Sjöblom ◽

Sameer Mhatre ◽

Sébastien Simon ◽

Roar Skartlien ◽

Geir Sørland

Keyword(s):

Electric Fields ◽

External Electric Fields

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Hydrogen and Halogen Bonding in Homogeneous External Electric Fields: Modulating the Bond Strengths

Chemistry - A European Journal ◽

10.1002/chem.202102284 ◽

2021 ◽

Author(s):

Li Chen ◽

Jingshuang Dang ◽

Juan Du ◽

Changwei Wang ◽

Yirong Mo

Keyword(s):

Electric Fields ◽

Halogen Bonding ◽

External Electric Fields ◽

Bond Strengths

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Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures

Scientific Reports ◽

10.1038/s41598-021-94842-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Zainab Gholami ◽

Farhad Khoeini

Keyword(s):

Electric Fields ◽

High Spin ◽

High Efficiency ◽

Practical Applications ◽

External Electric Fields ◽

Ferromagnetic Exchange ◽

High Spin Polarization ◽

Filtering Effect ◽

Spin Switching ◽

Spin Filtering

AbstractThe main contribution of this paper is to study the spin caloritronic effects in defected graphene/silicene nanoribbon (GSNR) junctions. Each step-like GSNR is subjected to the ferromagnetic exchange and local external electric fields, and their responses are determined using the nonequilibrium Green’s function (NEGF) approach. To further study the thermoelectric (TE) properties of the GSNRs, three defect arrangements of divacancies (DVs) are also considered for a larger system, and their responses are re-evaluated. The results demonstrate that the defected GSNRs with the DVs can provide an almost perfect thermal spin filtering effect (SFE), and spin switching. A negative differential thermoelectric resistance (NDTR) effect and high spin polarization efficiency (SPE) larger than 99.99% are obtained. The system with the DV defects can show a large spin-dependent Seebeck coefficient, equal to Ss ⁓ 1.2 mV/K, which is relatively large and acceptable. Appropriate thermal and electronic properties of the GSNRs can also be obtained by tuning up the DV orientation in the device region. Accordingly, the step-like GSNRs can be employed to produce high efficiency spin caloritronic devices with various features in practical applications.

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