Study of Two-Dimensional Hole Gas at Si/SiGe/Si Inverted Interface

• Authors: M. Sadeghzadeh , O. Mironov , C. Emeleus , C. Parry , P. Phillips , E. Parker , T. Whall
• Languages of publication: EN

Abstracts

EN

We have studied the transport properties of a two-dimensional hole gas (2DHG) at the inverted interface of a strained Si_{0.8}Ge_{0.2} quantum well. By application of a bias voltage to a Schottky gate on top of this inverted heterostructure the 2DHG density n_{s} can be controlled, in the range of (1.5-5.2)×10^{11} cm^{-2}. At a temperature T=0.33 K, the Hall mobility is 4650 cm^{2} V^{-1} s^{-1} at the maximum carrier density. For lower sheet densities (n_{s}<2×10^{11} cm^{-2}) the system undergoes a transition from a weak to strongly localised phase of significantly reduced mobility. From low temperature Shubnikov-de Haas oscillation measurements we have extracted the hole effective masses m*=(0.25 → 0.28)m_{0} and the ratio of transport to quantum lifetimes α=(0.92 → 0.85) for the corresponding carrier density change of n_{s}=(5.2 → 2.5)×10^{11} cm^{-2}. These results can be explained in terms of the abnormal movement of the hole wave function towards the interface with decreasing n_{s}, short range interface charge and interface roughness scattering.

Keywords

EN

73.20.Fz

Discipline

• 73.20.Fz: Weak or Anderson localization

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1998
• Volume: 94
• Issue: 3
• Pages: 503-508

Dates

published

1998-09

Contributors

author

M. Sadeghzadeh

• Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, U.K.

author

O. Mironov

• Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, U.K.

author

C. Emeleus

• Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, U.K.

author

C. Parry

• Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K.

author

P. Phillips

• Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K.

author

E. Parker

• Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K.

author

T. Whall

• Department of Physics, University of Warwick, Coventry, CV4 7AL, U.K.

Identifiers

DOI

10.12693/APhysPolA.94.503