Spin density functional theory simulations of quantum point contacts: An investigation of spin filtering effects

Richard Akis, David Ferry

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this paper, we present simulations of quantum point contacts (QPCs) formed in semiconductor heterostructures over which a metal split-gate has been deposited. Biasing the gates creates a quasi-1D channel (ie. a wire, or a QPC for very short channels) which separates the 2DEG into source and drain regions and through which current can flow. Besides the usual plateaus at integer multiples of G0= (2e2/h), more recent experiments on QPCs however have found additional non-integer plateaus, perhaps the most noteworthy being a ∼0.7 G0 conductance anomaly. Incorporating spin-density-functional theory (SDFT) into our calculations, we are able obtain similar anomalies in our simulations. Moreover, we find that these features can be correlated with the formation of a spin-dependent energy barrier structure.

Original languageEnglish (US)
Title of host publication2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 Technical Proceedings
EditorsM. Laudon, B. Romanowicz
Pages240-243
Number of pages4
StatePublished - 2005
Event2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 - Anaheim, CA, United States
Duration: May 8 2005May 12 2005

Other

Other2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005
CountryUnited States
CityAnaheim, CA
Period5/8/055/12/05

Fingerprint

Point contacts
Density functional theory
Two dimensional electron gas
Energy barriers
Heterojunctions
Wire
Semiconductor materials
Metals
Experiments

Keywords

  • Heterostructures
  • Quantum transport
  • Spin density functional theory
  • Spintronics

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Akis, R., & Ferry, D. (2005). Spin density functional theory simulations of quantum point contacts: An investigation of spin filtering effects. In M. Laudon, & B. Romanowicz (Eds.), 2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 Technical Proceedings (pp. 240-243)

Spin density functional theory simulations of quantum point contacts : An investigation of spin filtering effects. / Akis, Richard; Ferry, David.

2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 Technical Proceedings. ed. / M. Laudon; B. Romanowicz. 2005. p. 240-243.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Akis, R & Ferry, D 2005, Spin density functional theory simulations of quantum point contacts: An investigation of spin filtering effects. in M Laudon & B Romanowicz (eds), 2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 Technical Proceedings. pp. 240-243, 2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005, Anaheim, CA, United States, 5/8/05.
Akis R, Ferry D. Spin density functional theory simulations of quantum point contacts: An investigation of spin filtering effects. In Laudon M, Romanowicz B, editors, 2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 Technical Proceedings. 2005. p. 240-243
Akis, Richard ; Ferry, David. / Spin density functional theory simulations of quantum point contacts : An investigation of spin filtering effects. 2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005 Technical Proceedings. editor / M. Laudon ; B. Romanowicz. 2005. pp. 240-243
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