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Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure (2016)
Journal Article
Haywood, S. K., Rybchenko, S. I., Touhami, D., & Wadhawan, J. D. (2016). Study of pyridine-mediated electrochemical reduction of CO2 to methanol at high CO2 pressure. ChemSusChem, 9(13), 1660-1669. https://doi.org/10.1002/cssc.201600267

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The recently proposed highly efficient route of pyridine-catalyzed CO 2 reduction to methanol was explored on platinum electrodes at high CO 2 pressure. At 55 bar (5.5 MPa) of CO 2 , the bulk elec... Read More

Small-vocabulary speech recognition using a silent speech interface based on magnetic sensing (2012)
Journal Article
Hofe, R., Ell, S. R., Fagan, M. J., Gilbert, J., Green, P. D., Moore, R. K., & Rybchenko, S. (2013). Small-vocabulary speech recognition using a silent speech interface based on magnetic sensing. Speech communication, 55(1), (22-32). doi:10.1016/j.specom.2012.02.001. ISSN 0167-6393

This paper reports on word recognition experiments using a silent speech interface based on magnetic sensing of articulator movements. A magnetic field was generated by permanent magnet pellets fixed to relevant speech articulators. Magnetic field se... Read More

Modeling and analysis of intraband absorption in quantum-dot-in-well mid-infrared photodetectors (2012)
Journal Article
Hong, B. H., Rybchenko, S. I., Itskevich, I. E., Haywood, S. K., Haywood, S., Itskevich, I., …Vines, P. (2012). Modeling and analysis of intraband absorption in quantum-dot-in-well mid-infrared photodetectors. Journal of applied physics, 111(3), (033713). doi:10.1063/1.3684603. ISSN 0021-8979

Intraband absorption in quantum-dot-in-a-well (DWELL) mid-infrared photodetectors is investigated using photocurrent spectroscopy and computationally cost-effective modeling linked to experimental data. The DWELL systems are challenging for modeling... Read More

Speech synthesis parameter generation for the assistive silent speech interface MVOCA (2011)
Journal Article
Rybchenko, S., Fagan, M., & Gilbert, J. (2011). Speech synthesis parameter generation for the assistive silent speech interface MVOCA

In previous publications, a silent speech interface based on permanent-magnetic articulography (PMA) has been introduced and evaluated using standard automatic speech recognition techniques. However, word recognition is a task that is computationally... Read More

Evaluation of a silent speech interface based on magnetic sensing (2010)
Conference Proceeding
Hofe, R., Ell, S. R., Fagan, M. J., Gilbert, J. M., Green, P. D., Moore, R. K., & Rybchenko, S. I. (2010). Evaluation of a silent speech interface based on magnetic sensing

This paper reports on isolated word recognition experiments using a novel silent speech interface. The interface consist of magnetic pellets that are fixed to relevant speech articulators, and a set of magnetic field sensors that measure changes in t... Read More

Isolated word recognition of silent speech using magnetic implants and sensors (2010)
Journal Article
Gilbert, J. M., Rybchenko, S. I., Hofe, R., Ell, S. R., Fagan, M. J., Moore, R. K., & Green, P. (2010). Isolated word recognition of silent speech using magnetic implants and sensors. Medical engineering & physics, 32(10), (1189-1197). doi:10.1016/j.medengphy.2010.08.011. ISSN 1350-4533

There are a number of situations where individuals wish to communicate verbally but are unable to use conventional means so called 'silent speech'. These include speakers in noisy and covert situations as well as patients who have lost their voice as... Read More

Strained arrays of colloidal nanoparticles: Conductance and magnetoresistance enhancement (2009)
Journal Article
Haywood, S. K., Itskevich, I. E., Paunov, V. N., Rybchenko, S. I., & Dyab, A. K. F. (2009). Strained arrays of colloidal nanoparticles: Conductance and magnetoresistance enhancement. Nanotechnology, 20(42), doi:10.1088/0957-4484/20/42/425607. ISSN 0957-4484

Colloidal nanoparticles are very popular as building blocks of functional arrays for electronic and optical applications. However, there is a problem in achieving electrical conductivity in such nanoarrays due to their molecular shells. These shells,... Read More

Applicability of the kp method to modeling of InAs/GaSb short-period superlattices (2009)
Journal Article
Hong, B. H., Rybchenko, S. I., Itskevich, I. E., Haywood, S. K., Intartaglia, R., Tasco, V., …Tasco, V. (2009). Applicability of the kp method to modeling of InAs/GaSb short-period superlattices. Physical review B: Condensed matter and materials physics, 79(16), (165323-1-165323-4). doi:10.1103/PhysRevB.79.165323. ISSN 1098-0121

We investigate the long-standing controversy surrounding modeling of the electronic spectra of InAs/GaSb short-period superlattices (SPSLs). Most commonly, such modeling for semiconductor heterostructures is based on the kp method. However, this meth... Read More

Type-II InAsxSb1-x/InAs quantum dots for midinfrared applications: Effect of morphology and composition on electronic and optical properties (2009)
Journal Article
Yeap, G. H., Rybchenko, S. I., Itskevich, I. E., & Haywood, S. K. (2009). Type-II InAsxSb1-x/InAs quantum dots for midinfrared applications: Effect of morphology and composition on electronic and optical properties. Physical review B: Condensed matter and materials physics, 79(7), (075305-1-075305-6). doi:10.1103/physrevb.79.075305. ISSN 1098-0121

InSb-based self-assembled quantum dots are very promising for the midinfrared (3-5μm) optical range. We have analyzed the effect of geometry and composition on the electronic structure and optical spectra of InAsx Sb1-x /InAs dots. The calculated tra... Read More

L-band-related interband transition in InSb/GaSb self-assembled quantum dots (2008)
Book
Rybchenko, S. I., Gupta, R., Itskevich, I. E., & Haywood, S. K. (2008). L-band-related interband transition in InSb/GaSb self-assembled quantum dots. Springer Proceedings in Physics; Narrow Gap Semiconductors 2007, 81-83. Springer Verlag. doi:10.1007/978-1-4020-8425-6_20

Effect of lattice-mismatch-induced strain on Γ-, X- and L-conduction-band edges in III-V self-assembled quantum dots has been calculated. The misfit strain is shown to strongly affect the band edges, leading to a possibility of Γ-L and &G... Read More

Conduction-band crossover induced by misfit strain in InSb/GaSb self-assembled quantum dots (2007)
Journal Article
Tournié, E., Baranov, A. N., Deguffroy, N., Tasco, V., Itskevich, I. E., Gupta, R., …Haywood, S. K. (2007). Conduction-band crossover induced by misfit strain in InSb/GaSb self-assembled quantum dots. Physical review B: Condensed matter and materials physics, 76(19), 0 - 0. doi:10.1103/physrevb.76.193309

We address the occurrence of conduction-band crossover in III-V self-assembled quantum dots solely due to misfit strain. Band structure analysis in terms of standard deformation-potential theory shows that Γ-X crossover can occur in the dot, while bo... Read More

Midinfrared photoluminescence and compositional modulation in pentanary GaInAsPSb alloys grown by liquid phase epitaxy (2007)
Journal Article
Krier, A., Smirnov, V. M., Batty, P. J., Yin, M., Lai, K. T., Rybchenko, S., …Kuchinskii, V. I. (2007). Midinfrared photoluminescence and compositional modulation in pentanary GaInAsPSb alloys grown by liquid phase epitaxy. Applied physics letters, 91(8), 082102. doi:10.1063/1.2768892

Room temperature photoluminescence is reported from GaInAsSbP pentanary alloys grown by liquid phase epitaxy on GaSb. The epitaxial layers exhibited emission in the midinfrared between 3 and 4 μm. Investigation of the structural and photoluminescence... Read More

Importance of aspect ratio over shape in determining the quantization potential of self-assembled zinc-blende III-V quantum dots (2007)
Journal Article
Gupta, R., Yeap, G., Rybchenko, S. I., Itskevich, I. E., & Haywood, S. K. (2007). Importance of aspect ratio over shape in determining the quantization potential of self-assembled zinc-blende III-V quantum dots. Journal of applied physics, 102(1), 013706. doi:10.1063/1.2752127

We have studied the effect of shape on the strain-modified electron/hole confinement potential in zinc-blende quantum dots (QDs), using standard deformation potential theory and an anisotropic continuum-elasticity approximation. Calculations were per... Read More

Effect of interface passivation on the magnetoresistance of granular magnetite Fe3(1-δ)O4 (2006)
Journal Article
Awano, M., Takagi, H., Fujishiro, Y., & Rybchenko, S. I. (2006). Effect of interface passivation on the magnetoresistance of granular magnetite Fe3(1-δ)O4. Applied physics letters, 89(13), doi:10.1063/1.2357581

The reductive passivation of granular interface was proposed to enhance the tunneling magnetoresistance of bulk granular magnetite. For this, an annealing in paraffin wax has been applied. As a result, the low-field magnetoresistance response was inc... Read More

Tuning of electronic coupling between self-assembled quantum dots (2005)
Journal Article
Rybchenko, S., Itskevich, I., Skolnick, M. S., Cahill, J., Tartakovskii, A. I., Hill, G., & Hopkinson, M. (2005). Tuning of electronic coupling between self-assembled quantum dots. Applied physics letters, 87(3), 033104. doi:10.1063/1.1995953

Semiconductor self-assembled quantum dots (SAQDs) normally have zero-dimensional properties, but become coupled and acquire higher-dimensional character if the distance between the dots is small. Using photoluminescence spectroscopy under high hydros... Read More

High pressure as a tool to tune electronic coupling in self-assembled quantum dot nanostructures (2004)
Journal Article
Itskevich, E., Hopkinson, M., Hill, G., Skolnick, M., Tartakovskii, A., Cahill, J., …Itskevich, I. (2004). High pressure as a tool to tune electronic coupling in self-assembled quantum dot nanostructures. physica status solidi (b), 241(14), 3257-3262. doi:10.1002/pssb.200405235

High pressure provides an efficient way of controlling the electronic properties of semiconductor nanostructures. We use pressure to tune electronic coupling in stacks of self-assembled quantum dots (SAQDs). The coupling occurs as soon as the distanc... Read More

Stark shift in electroluminescence of individual InAs quantum dots (2000)
Journal Article
Parnell, S., Henini, M., Eaves, L., Main, P., Levin, A., Stoddart, S., …Itskevich, I. (in press). Stark shift in electroluminescence of individual InAs quantum dots. Applied physics letters, 76(26), 3932-3934. doi:10.1063/1.126825

We have fabricated light-emitting-diode heterostructure devices, in which a layer of InAs self-assembled quantum dots is embedded, with an active area of submicron size. In the electroluminescence spectra of these devices, we observed isolated narrow... Read More

Electroluminescence from individual InAs self-assembled quantum dots (2000)
Journal Article
Itskevich, I., Stoddart, S., Rybchenko, S., Tartakovskii, I., Eaves, L., Parnell, S., …Henini, M. (2000). Electroluminescence from individual InAs self-assembled quantum dots. Physica status solidi. A, Applied research, 178(1), 307-311. doi:10.1002/1521-396X(200003)178:13.0.CO;2-Y

Emission lines from individual InAs self-assembled quantum dots (SAQD) have been observed in electroluminescence spectra from small-area p-i-n light-emitting-diode heterostructure devices containing an embedded layer of SAQD. In the energy range whic... Read More