Spin transport and optically-probed coherence in magnetic semiconductor heterostructures

I. P. Smorchkova, F. S. Flack, Nitin Samarth, J. M. Kikkawa, S. A. Crooker, D. D. Awschalom

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Molecular beam epitaxy is used to "spin engineer" an environment wherein quantum-confined electronic states in a wide band gap II-VI semiconductor quantum well (Zn1-xCdx Se) are strongly exchange-coupled to systematic 2D distributions of localized spins (Mn2+ ions). Magneto-optical spectroscopy of undoped structures demonstrates that such a scheme successfully produces well-confined excitonic states whose Zeeman splitting in modest magnetic fields greatly exceeds the inhomogeneous line widths. In modulation-doped structures, a combination of magneto-transport and magneto-optical measurements shows the formation of a "magnetic" two-dimensional electron gas characterized by spin gaps which are much larger than Landau level gaps. This results in a novel quantum Hall system which can be highly spin polarized even at large filling factors. Time-resolved Faraday/Kerr effect measurements in the Voigt geometry probe the electronic spin dynamics of the exciton/electron gas, revealing terahertz and gigahertz oscillations that originate from the coherent spin precession of electrons and local moments, respectively.

Original languageEnglish (US)
Pages (from-to)676-684
Number of pages9
JournalPhysica B: Condensed Matter
Volume249-251
DOIs
StatePublished - Jun 17 1998

Fingerprint

Magnetic semiconductors
Heterojunctions
Spin dynamics
Electron gas
Two dimensional electron gas
Electronic states
Molecular beam epitaxy
Excitons
Linewidth
Semiconductor quantum wells
Modulation
electron gas
Ions
Magnetic fields
Engineers
Geometry
Electrons
quantum electronics
spin dynamics
Kerr effects

All Science Journal Classification (ASJC) codes

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

Cite this

Smorchkova, I. P. ; Flack, F. S. ; Samarth, Nitin ; Kikkawa, J. M. ; Crooker, S. A. ; Awschalom, D. D. / Spin transport and optically-probed coherence in magnetic semiconductor heterostructures. In: Physica B: Condensed Matter. 1998 ; Vol. 249-251. pp. 676-684.
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Spin transport and optically-probed coherence in magnetic semiconductor heterostructures. / Smorchkova, I. P.; Flack, F. S.; Samarth, Nitin; Kikkawa, J. M.; Crooker, S. A.; Awschalom, D. D.

In: Physica B: Condensed Matter, Vol. 249-251, 17.06.1998, p. 676-684.

Research output: Contribution to journalArticle

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AU - Smorchkova, I. P.

AU - Flack, F. S.

AU - Samarth, Nitin

AU - Kikkawa, J. M.

AU - Crooker, S. A.

AU - Awschalom, D. D.

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