Energy relaxation studies in In0.52Al0.48As/In 0.53Ga0.47As/In0.52Al0.48As two-dimensional electron gases and quantum wires

C. Prasad; D. K. Ferry; H. H. Wieder

doi:10.1088/0268-1242/19/4/022

Energy relaxation studies in In_0.52Al_0.48As/In _0.53Ga_0.47As/In_0.52Al_0.48As two-dimensional electron gases and quantum wires

C. Prasad, D. K. Ferry, H. H. Wieder

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We present Joule heating measurements carried out over a wide temperature range on two-dimensional electron gases (2DEGs) and quantum wires of varying widths fabricated in an In_0.52Al_0.48As/In _0.53Ga_0.47As/In_0.52Al_0.48As heterostructure system that has a 25 nm wide In_0.53Ga _0.47As quantum well region. The power dissipated per electron is extracted and the electron-phonon coupling processes in these systems are studied. The temperature decay of the power loss at the 2DEG points towards unscreened piezoelectric coupling to the acoustic modes over temperatures of 1-30 K, with boundary scattering in the ohmic contacts gaining importance at very low temperatures. In the wires, we observe different behaviour and the effect of wire width and carrier density on the observed energy-loss rates. Possible phonon confinement and exponential suppression in these structures are also looked at.

Original language	English (US)
Pages (from-to)	S60-S63
Journal	Semiconductor Science and Technology
Volume	19
Issue number	4 SPEC. ISS.
DOIs	https://doi.org/10.1088/0268-1242/19/4/022
State	Published - Apr 2004

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0268-1242/19/4/022

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title = "Energy relaxation studies in In0.52Al0.48As/In 0.53Ga0.47As/In0.52Al0.48As two-dimensional electron gases and quantum wires",

abstract = "We present Joule heating measurements carried out over a wide temperature range on two-dimensional electron gases (2DEGs) and quantum wires of varying widths fabricated in an In0.52Al0.48As/In 0.53Ga0.47As/In0.52Al0.48As heterostructure system that has a 25 nm wide In0.53Ga 0.47As quantum well region. The power dissipated per electron is extracted and the electron-phonon coupling processes in these systems are studied. The temperature decay of the power loss at the 2DEG points towards unscreened piezoelectric coupling to the acoustic modes over temperatures of 1-30 K, with boundary scattering in the ohmic contacts gaining importance at very low temperatures. In the wires, we observe different behaviour and the effect of wire width and carrier density on the observed energy-loss rates. Possible phonon confinement and exponential suppression in these structures are also looked at.",

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AU - Ferry, D. K.

AU - Wieder, H. H.

PY - 2004/4

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N2 - We present Joule heating measurements carried out over a wide temperature range on two-dimensional electron gases (2DEGs) and quantum wires of varying widths fabricated in an In0.52Al0.48As/In 0.53Ga0.47As/In0.52Al0.48As heterostructure system that has a 25 nm wide In0.53Ga 0.47As quantum well region. The power dissipated per electron is extracted and the electron-phonon coupling processes in these systems are studied. The temperature decay of the power loss at the 2DEG points towards unscreened piezoelectric coupling to the acoustic modes over temperatures of 1-30 K, with boundary scattering in the ohmic contacts gaining importance at very low temperatures. In the wires, we observe different behaviour and the effect of wire width and carrier density on the observed energy-loss rates. Possible phonon confinement and exponential suppression in these structures are also looked at.

AB - We present Joule heating measurements carried out over a wide temperature range on two-dimensional electron gases (2DEGs) and quantum wires of varying widths fabricated in an In0.52Al0.48As/In 0.53Ga0.47As/In0.52Al0.48As heterostructure system that has a 25 nm wide In0.53Ga 0.47As quantum well region. The power dissipated per electron is extracted and the electron-phonon coupling processes in these systems are studied. The temperature decay of the power loss at the 2DEG points towards unscreened piezoelectric coupling to the acoustic modes over temperatures of 1-30 K, with boundary scattering in the ohmic contacts gaining importance at very low temperatures. In the wires, we observe different behaviour and the effect of wire width and carrier density on the observed energy-loss rates. Possible phonon confinement and exponential suppression in these structures are also looked at.

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Energy relaxation studies in In_0.52Al_0.48As/In _0.53Ga_0.47As/In_0.52Al_0.48As two-dimensional electron gases and quantum wires

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