Effect in Coherently Strained B-Doped (001)SiGe/Si Heterostructures

• Authors: V.I. Knizhny , O.A. Mironov , O.A. Makarovskii , G. Braithwaite , N.L. Mattey , E.H.C. Parker , P.J. Phillips
• Languages of publication: EN

Abstracts

EN

We report on two methods which illustrate piezoelectric effects in the strained Si (100)Si_{1-x}/Ge_{x} system. The non-contact sound excitation tech­nique has been used to reveal the conversion of a high-frequency electric field E into acoustic waves at 77 K which can also be modulated by a dc applied bias voltage (±30 V). The sample was an MBE grown modulation doped Si_{0.88}Ge_{0.12}/(001)Si structure with a carrier sheet density 2.0 × 10^{11} cm^{-2} and a 4.2 K mobility 10500 cm^{2} V^{-1} s^{-1}. We deduce that the observed high-frequency electric field acoustic wave conversion is associated with a piezoelectric-like effect possibly due to ordering in the strained SiGe alloy or symmetry breaking effect near Si/SiGe interface. Further evidence is pro­vided by the existence of a piezoelectric phonon interaction in the hot hole energy relaxation mechanism determined from high electric field Shubnikov de Haas He^{3} low temperature measurements.

Keywords

EN

73.50.Rb; 73.61.Cw; 73.50.Μx

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 88
• Issue: 4
• Pages: 779-782

Dates

published

1995-10

Contributors

author

V.I. Knizhny

• Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12, Acad. Proscura st., Kharkov, 310085, Ukraine

author

O.A. Mironov

• Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12, Acad. Proscura st., Kharkov, 310085, Ukraine

author

O.A. Makarovskii

• Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12, Acad. Proscura st., Kharkov, 310085, Ukraine

author

G. Braithwaite

• Department of Physics, University of Warwick, Coventry, CV4 7AL, UK

author

N.L. Mattey

• Department of Physics, University of Warwick, Coventry, CV4 7AL, UK

author

E.H.C. Parker

• Department of Physics, University of Warwick, Coventry, CV4 7AL, UK

author

P.J. Phillips

• Department of Physics, University of Warwick, Coventry, CV4 7AL, UK