Prof. Dr. Boris Ashkinadze

Member of the Solid State Institute and

Physics Department of the Technion-Israel Institute of Technology (Since 1990).

Education

1. M.Sc. degree in physics and electronics,

Politechnical University, Leningrad (St-Petersburg, Russia) (1964).

2. Ph.D. degree in solid state physics,

A. F. Ioffe Physico-Technical Institute, Leningrad (1970).

3. Doctor of physico-mathematical sciences,

A. F. Ioffe Physico-Technical Institute, (1981).

Research and research interests

(1965-1990) - A. F. Ioffe Physico-Technical Institute, Leningrad:

- Nonlinear optics of semiconductors (two, three photon absorption processes)

- Non-equilibrium phase transitions and many-body effects in the electron
and/or excitons systems: (electron-hole liquid, optical bistability, generation-recombination
instabilities,
exciton breakdown and self-oscillations)

- Dynamics of electrons and excitons in semiconductors (exciton formation and dissociation,
electron momentum and energy relaxation processes, hot electrons, photoexcitated e-h pair
lifetimes, cyclotron resonance, interaction with nonequilibrium phonons)

-

since 1990 - Solid State Institute, Technion

- optical and microwave spectroscopy of semiconductor quantum structures

- spectral exciton diffusion and electron-exciton interactions

- electron density self-oscillations due to impurity breakdown in GaAs

- properties of two-dimensional electron gas in modulation doped quantum wells
and heterojunctions: photoluminescence of heterostructures, cyclotron resonance, hot electrons

- hysteretic dimensional magnetoplasma resonance, photoluminescence bistability

- magneto-optics of semiconductors

The main experimental methods:

a. Low-temperature photoluminescence,

Photoluminescence excitation spectroscopy,

Magnetophotoluminescence,

Resonant Raman scattering

b. Microwave radiation diagnostics

Cyclotron resonance, dimensional magnetoplasma resonances

Optically detected microwave-induced resonances

Recent publications

1. Free carrier effect on exciton dynamics in GaAs/AlGaAs quantum wells.
   B. M. Ashkinadze, E. Linder, E. Cohen, Arza Ron, L. N. Pfeiffer: Phys. Rev. B51, 1938-1941 (1995)
2. Self-oscillations at photoinduced impurity breakdown in GaAs.
   M. Kozhevnikov, B. M. Ashkinadze, E. Cohen, Arza Ron, Phys. Rev. B52, 4855-4863 (1995).
3. Low temperature electron mobility studied by cyclotron resonance in ultra-pure GaAs crystals.
   M. Kozhevnikov, B. M. Ashkinadze, E. Cohen, Arza Ron, Phys. Rev. B52, 17165-17171 (1995).
4. Electron-assisted exciton transfer and long-lived electrons and holes in GaAs/AlGaAs quantum wells,
   B. M. Ashkinadze, E. Tsidilkovskii, E. Linder, E. Cohen, Arza Ron, Phys.Rev. B54, 8728-8736 (1996).
5. Hysteretic microwave cyclotronlike resonance in a laterally confined two-dimensional electron gas,
   B. M. Ashkinadze and V.Yudson. Phys. Rev. Letters, 83, 812 (1999)
6. Exciton-electron dynamics studied by microwave photoconductivity in undoped GaAs QWs,
   M. Kozhevnikov, B.M. Ashkinadze, E. Cohen, Arza Ron, H.Shtrikman, Phys. Rev. B60, 16894 (1999
7. Dimensional magnetoplasma resonance detected by free exciton photoluminescence in GaAs/AlGaAs
   B. M. Ashkinadze, E. Linder, V. Umansky, Phys. Rev. B62, 16894 (2000).

8. Photoluminescence hysteresis of the optically detected cyclotron-like resonance of a 2DEHG,
B. M. Ashkinadze, V. Voznyy, E. Linder, E. Cohen, A. Ron, Phys. Rev. B64, 161306 (2001)

9. Condensation of bulk excitons on magnetized 2DEG in modulation doped heterojunctions”,
B. M. Ashkinadze, V. Voznyy, E. Cohen, A. Ron, V. Umansky Phys. Rev. B65, 073311 (2002)

10. Luminescence of a 2DEG in modulation doped QW at filling factors <1
B. M. Ashkinadze, E. Linder, E. Cohen, A.B. Dzyubenko, L.N. Pfeiffer. Phys. Rev. B69, (2004