Femtosecond near-field spin microscopy in digital magnetic heterostructures (invited)

J. Levy; V. Nikitin; J. M. Kikkawa; D. D. Awschalom; N. Samarth

doi:10.1063/1.362101

Femtosecond near-field spin microscopy in digital magnetic heterostructures (invited)

J. Levy, V. Nikitin, J. M. Kikkawa, D. D. Awschalom, N. Samarth

Physics

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

35 Scopus citations

Abstract

We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field.

Original language	English (US)
Pages (from-to)	6095-6100
Number of pages	6
Journal	Journal of Applied Physics
Volume	79
Issue number	8 PART 2B
DOIs	https://doi.org/10.1063/1.362101
State	Published - Apr 15 1996

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1063/1.362101

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abstract = "We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field.",

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year = "1996",

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AU - Levy, J.

AU - Nikitin, V.

AU - Kikkawa, J. M.

AU - Awschalom, D. D.

AU - Samarth, N.

PY - 1996/4/15

Y1 - 1996/4/15

N2 - We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field.

AB - We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field.

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ER -

Femtosecond near-field spin microscopy in digital magnetic heterostructures (invited)

Abstract

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