Výsledky vyhledávání - "Velichko, Anton"

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Defect-Free Axially-Stacked GaAs/GaAsP Nanowire Quantum Dots with Strong Carrier Confinement

Autor: Zhang, Yunyan, Velichko, Anton V., Fonseka, H. Aruni, Parkinson, Patrick, Davis, George, Gott, James A., Aagesen, Martin, Sanchez, Ana M., Mowbray, David, Liu, Huiyun

Axially-stacked quantum dots (QDs) in nanowires (NWs) have important applications in fabricating nanoscale quantum devices and lasers. Although their performances are very sensitive to crystal quality and structures, there is relatively little study

Externí odkaz: http://arxiv.org/abs/2002.07071

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Anomalous Features in Surface Impedance of Y-Ba-Cu-O Thin Films: Dependence on Frequency, RF and DC Fields

Autor: Velichko, Anton V., Porch, Adrian, Humphreys, Richard G.

Two high-quality Y-Ba-Cu-O thin films on MgO substrates have been investigated using the coplanar resonator technique at 8 and 16 GHz. Both films exhibit an anomalous decrease in their surface impedance, Zs as a function of microwave field, Hrf. In z

Externí odkaz: http://arxiv.org/abs/cond-mat/0008302

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Unusual features in the nonlinear microwave surface impedance of Y-Ba-Cu-O thin films

Autor: Kharel, A. P., Velichko, Anton V., Powell, J. R., Porch, A., Lancaster, M. J., Humphreys, R. G.

Publikováno v: Published in Phys.Rev. B 58, 11189-11192 (1998)

Striking features have been found in the nonlinear microwave (8 GHz) surface impedance $Z_s=R_s + jX_s$ of high-quality YBaCuO thin films with comparable low power characteristics [$R_{res}\sim 35--60 \mu\Omega$ and $\lambda_L(15 K)\sim 130--260 nm$]

Externí odkaz: http://arxiv.org/abs/cond-mat/9904137

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Modelling the Nonlinear High-Frequency Response of a Short Josephson Junction under Two-Frequency Irradiation

Autor: Velichko, Anton V., Porch, Adrian

The nonlinear response of a short Josephson Junction (JJ), being irradiated simultaneously with two high-frequency signals, has been studied in the framework of the nonlinear Resistively-Shunted Junction (RSJ) Model. One of the signals, hereafter ref

Externí odkaz: http://arxiv.org/abs/cond-mat/9903307

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Phenomenological Model of the Nonlinear Microwave Response of a Superconductor Containing Weak Links

Autor: Velichko, Anton V., Porch, Adrian

A phenomenological model is proposed which describes the effect of both dc and rf magnetic fields, $H$, on the microwave surface impedance, Z_s=R_s+jX_s, of a superconductor containing weak link. Two cases are considered; a weak link between two grai

Externí odkaz: http://arxiv.org/abs/cond-mat/9903304

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