Professor Tim Ashley
Professor Tim Ashley
Professor
T dot Ashley at warwick dot ac dot uk
+44 (0) 24 7655 1817
Biography
- Fellow of Institute of Physics
- Visiting Professor at Imperial College London and University of Surrey
- Member of organising committees of various conferences
- EPSRC Peer Review referee
- EU Reviewer of proposals and ongoing projects
- Referee for a number of scientific journals
- External examiner for PhD students
Research Interests
- Narrow band-gap semiconductors
- Infrared detectors arrays
- Uncooled discrete detectors
- IR Negative luminescent devices
- LEDs for gas sensors
- Mid-IR diode lasers
- Highly sensitive magnetic field sensors
- Ultra-fast low power dissipation transistors
Teaching Interests
Selected Publications
- Vavasour, Oliver J., Jefferies, Richard, Walker, Marc, Roberts, Joseph W., Meakin, Naomi R., Gammon, P. M., Chalker, Paul R, Ashley, Tim, 2019. Effect of HCl cleaning on InSb?Al2O3 MOS capacitors. Semiconductor Science and Technology, 34 (3)
- Stachel, S., Budkin, G. V., Hagner, U., Bel'kov, V. V., Glazov, M. M., Tarasenko, S. A., Clowes, S. K., Ashley, Tim, Gilbertson, A. M., Ganichev, S. D., 2014. Cyclotron-resonance-assisted photon drag effect in InSb/InAlSb quantum wells excited by terahertz radiation. Physical Review B (Condensed Matter and Materials Physics), 89 (11)
- Mudd, James J., Kybert, Nicholas J., Linhart, W. M., Buckle, L., Ashley, Tim, King, P. D. C., Jones, T. S. (Tim S.), Ashwin, M. J., Veal, T. D. (Tim D.), 2013. Optical absorption by dilute GaNSb alloys : influence of N pair states. Applied Physics Letters, 103 (4)
- Alexander-Webber, J. A., Baker, A. M. R., Buckle, P. D., Ashley, T., Nicholas, R. J., 2012. High-current breakdown of the quantum Hall effect and electron heating in InSb/AlInSb. Physical Review B (Condensed Matter and Materials Physics), 86 (4)
- Stachel, S., Olbrich, P., Zoth, C., Hagner, U., Stangl, T., Karl, C., Lutz, Peter, Bel'kov, V., Clowes, S. K. (Steve K.), Ashley, Tim, Gilbertson, A. M., Ganichev, S. D., 2012. Interplay of spin and orbital magnetogyrotropic photogalvanic effects in InSb/(Al,In)Sb quantum well structures. Physical Review B, 85 (4)
- Gilbertson, A. M., Fearn, M., Kormányos, A., Read, D. E., Lambert, C. J., Emeny, M. T., Ashley, Tim, Solin, S. A., Cohen, L. F., 2011. Ballistic transport and boundary scattering in InSb/In1-xAlxSb mesoscopic devices. Physical Review B (Condensed Matter and Materials Physics), 83 (7)
- Leontiadou, M. A., Litvinenko, K. L., Gilbertson, A. M., Pidgeon, C. R., Branford, W. R., Cohen, L. F., Fearn, M., Ashley, Tim, Emeny, M. T., Murdin, B. N., Clowes, S. K., 2011. Experimental determination of the Rashba coefficient in InSb/InAlSb quantum wells at zero magnetic field and elevated temperatures. Journal of Physics: Condensed Matter, 23 (3)
- Gilbertson, A. M., Kormányos, A., Buckle, P. D., Fearn, M., Ashley, T., Lambert, C. J., Solin, S. A., Cohen, L. F., 2011. Room temperature ballistic transport in InSb quantum well nanodevices. Applied Physics Letters, Vol. 99 (No. 24)
- Gilbertson, A. M., Benstock, D., Fearn, M., Kormányos, A., Ladak, S., Emeny, M. T., Lambert, C. J., Ashley, T., Solin, S. A., Cohen, L. F., 2011. Sub-100-nm negative bend resistance ballistic sensors for high spatial resolution magnetic field detection. Applied Physics Letters, Vol. 98 (No. 6)
- Gilbertson, A. M., Buckle, P. D., Emeny, M. T., Ashley, Tim, Cohen, L. F., 2011. Suppression of the parasitic buffer layer conductance in InSb/AlxIn1-xSb heterostructures using a wide-band-gap barrier layer. Physical Review B (Condensed Matter and Materials Physics), 84 (7)
- Pooley, O. J., Gilbertson, A. M., Buckle, P. D., Hall, R. S., Emeny, M. T., Fearn, M., Halsall, M. P., Cohen, L. F., Ashley, Tim, 2010. Quantum well mobility and the effect of gate dielectrics in remote doped InSb/AlxIn1 -xSb heterostructures. Semiconductor Science and Technology, 25 (12)
- Fox, Natasha E., Andreev, A. D., Nash, G. R., Ashley, Tim, Hosea, T. J. C., 2010. Room temperature spectroscopic characterization of mid-infrared GaInSb quantum-well laser structures. Semiconductor Science and Technology, 25 (3)
- Litvinenko, K. L., Leontiadou, M. A., Li, Juerong, Clowes, S. K., Emeny, M. T., Ashley, Tim, Pidgeon, C. R., Cohen, L. F., Murdin, B. N., 2010. Strong dependence of spin dynamics on the orientation of an external magnetic field for InSb and InAs. Applied Physics Letters, 96 (11)
- Pooley, O. J., Gilbertson, A. M., Buckle, P. D., Hall, R. S., Buckle, L., Emeny, M. T., Fearn, M., Cohen, L. F., Ashley, Tim, 2010. Transport effects in remote-doped InSb/AlxIn1-xSb heterostructures. New Journal of Physics, 12 (5)
- Pugh, J. R., Ho, Y-L. D., Heard, P. J., Nash, G. R., Ashley, Tim, Rarity, J. G., Cryan, M. J., 2009. Design and fabrication of a midinfrared photonic crystal defect cavity in indium antimonide. Journal of Optics A: Pure and Applied Optics, 11 (5)
- Tenev, T., Palyi, A., Mirza, B., Nash, G., Fearn, M., Smith, S., Buckle, L., Emeny, M., Ashley, Tim, Jefferson, J., Lambert, C., 2009. Energy level spectroscopy of InSb quantum wells using quantum-well LED emission. Physical Review B (Condensed Matter and Materials Physics), 79 (8)
- Buckle, L., Coomber, S. D., Ashley, Tim, Jefferson, Paul Harvey, Walker, David, Veal, T. D., McConville, C. F., Thomas, Pam A., 2009. Growth and characterisation of dilute antimonide nitride materials for long-wavelength applications. Microelectronics Journal, Vol.40 (No.3 Sp. Iss. SI), pp. 399-402
- Nash, Geoffrey R., Forman, Hannah L., Smith, Stuart J., Robinson, Peter B., Buckle, Louise, Coomber, Stuart D., Emeny, Martin T., Gordon, Neil T., Ashley, Tim, 2009. Mid-infrared AlxIn1-xSb light-emitting diodes and photodiodes for hydrocarbon sensing. IEEE Sensors Journal, 9 (10), pp. 1240-1243
- Nash, G. R., Przeslak, S. J. B., Smith, S. J., de Valicourt, G., Andreev, A. D., Carrington, P. J., Yin, M., Krier, A., Coomber, S. D., Buckle, L., Emeny, M. T., Ashley, T., 2009. Midinfrared GaInSb/AlGaInSb quantum well laser diodes operating above 200 K. Applied Physics Letters, Vol. 94 (No. 9)
- Nash, G. R., Ashley, T., 2009. Reduction in Shockley?Read?Hall generation-recombination in AlInSb light-emitting-diodes using spatial patterning of the depletion region. Applied Physics Letters, Vol.94 (No.21)
- Gilbertson, A., Branford, W., Fearn, M., Buckle, L., Buckle, P., Ashley, Tim, Cohen, L., 2009. Zero-field spin splitting and spin-dependent broadening in high-mobility InSb/In1-xAlxSb asymmetric quantum well heterostructures. Physical Review B (Condensed Matter and Materials Physics), 79 (23)
- Orr, J., Gilbertson, A., Fearn, M., Croad, O., Storey, C., Buckle, L., Emeny, M., Buckle, P., Ashley, Tim, 2008. Electronic transport in modulation-doped InSb quantum well heterostructures. Physical Review B (Condensed Matter and Materials Physics), 77 (16)
- Yin, M., Nash, G. R., Coomber, S. D., Buckle, L., Carrington, P. J., Krier, A., Andreev, A., Przeslak, S. J. B., de Valicourt, G., Smith, S. J., Emeny, M. T., Ashley, T., 2008. GaInSb/AlInSb multi-quantum-wells for mid-infrared lasers. Applied Physics Letters, Vol. 93 (No. 12)
- Nedniyom, B., Nicholas, R., Emeny, M., Buckle, L., Gilbertson, A., Buckle, P., Ashley, Tim, 2008. Giant enhanced g-factors in an InSb two-dimensional gas. Physical Review B (Condensed Matter and Materials Physics), 80 (12)
- Mirza, B. I., Nash, G. R., Smith, S. J., Buckle, L., Coomber, S. D., Emeny, M. T., Ashley, Tim, 2008. Recombination processes in midinfrared Al[sub x]In[sub 1-x]Sb light-emitting diodes. Journal of Applied Physics, 104 (6)
- Sharma, Tarun Kumar, Fox, Natasha Elizabeth, Hosea, Thomas Jeff Cockburn, Nash, Geoffrey Richard, Coomber, Stuart David, Buckle, Louise, Emeny, Martin Trevor, Ashley, Tim, 2008. Room temperature observation of the energy levels of mid-infrared quantum well lasers using Fourier transform infrared-surface photovoltage spectroscopy. Applied Physics Express, 1 (6)
- Litvinenko, K., Nikzad, L., Pidgeon, C., Allam, J., Cohen, L., Ashley, Tim, Emeny, M., Zawadzki, W., Murdin, B., 2008. Temperature dependence of the electron Landé g factor in InSb and GaAs. Physical Review B (Condensed Matter and Materials Physics), 77 (3)
- Lindsay, A., O?Reilly, E., Andreev, A., Ashley, Tim, 2008. Theory of conduction band structure of InNxSb1-x and GaNxSb1-x dilute nitride alloys. Physical Review B (Condensed Matter and Materials Physics), 77 (16)
Projects and Grants
Title | Funder | Award start | Award end |
---|---|---|---|
EPSRC Engineering Fellowships for Growth: Narrow Band-gap Semiconductors for Integrated Sensing and Communications (Full Application) | EPSRC | 01 Jun 2014 | 28 Feb 2018 |
CASE Studentship Agreement - Gas Sensing Solutions (Robert Espley-Jones) | Gas Sensing Solutions Ltd | 01 Nov 2013 | 30 Apr 2017 |