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

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish (US)
JournalSemiconductor Science and Technology
Volume19
Issue number4 SPEC. ISS.
DOIs
StatePublished - Apr 2004

Fingerprint

Semiconductor quantum wires
Two dimensional electron gas
quantum wires
electron gas
wire
Joule heating
power loss
Wire
Temperature
temperature
energy
Electrons
Ohmic contacts
electric contacts
electrons
energy dissipation
retarding
quantum wells
Semiconductor quantum wells
Carrier concentration

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Energy relaxation studies in In0.52Al0.48As/In 0.53Ga0.47As/In0.52Al0.48As two-dimensional electron gases and quantum wires. / Prasad, C.; Ferry, D. K.; Wieder, H. H.

In: Semiconductor Science and Technology, Vol. 19, No. 4 SPEC. ISS., 04.2004.

Research output: Contribution to journalArticle

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