Tuning interfacial spin filters from metallic to resistive within a single organic semiconductor family

Tuning interfacial spin filters from metallic to resistive within a single organic semiconductor... A metallic spin filter is observed at the interface between Alq3 adsorbates and a Cr(001) surface. It can be changed to a resistive (i.e., gapped) filter by substituting Cr ions to make Crq3 adsorbates. Spin-polarized scanning tunneling microscopy and spectroscopy show these spin-dependent electronic structure changes with single molecule resolution. Density functional theory calculations highlight the structural and electronic differences at the interfaces. For Alq3, a charge-transfer interaction with the substrate leads to a metallic spin filter. For Crq3, direct covalent interactions mix molecular orbitals with the substrate surface state to make two well-separated interfacial hybrid orbitals. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Tuning interfacial spin filters from metallic to resistive within a single organic semiconductor family

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Tuning interfacial spin filters from metallic to resistive within a single organic semiconductor family

Abstract

A metallic spin filter is observed at the interface between Alq3 adsorbates and a Cr(001) surface. It can be changed to a resistive (i.e., gapped) filter by substituting Cr ions to make Crq3 adsorbates. Spin-polarized scanning tunneling microscopy and spectroscopy show these spin-dependent electronic structure changes with single molecule resolution. Density functional theory calculations highlight the structural and electronic differences at the interfaces. For Alq3, a charge-transfer interaction with the substrate leads to a metallic spin filter. For Crq3, direct covalent interactions mix molecular orbitals with the substrate surface state to make two well-separated interfacial hybrid orbitals.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.95.241410
Publisher site
See Article on Publisher Site

Abstract

A metallic spin filter is observed at the interface between Alq3 adsorbates and a Cr(001) surface. It can be changed to a resistive (i.e., gapped) filter by substituting Cr ions to make Crq3 adsorbates. Spin-polarized scanning tunneling microscopy and spectroscopy show these spin-dependent electronic structure changes with single molecule resolution. Density functional theory calculations highlight the structural and electronic differences at the interfaces. For Alq3, a charge-transfer interaction with the substrate leads to a metallic spin filter. For Crq3, direct covalent interactions mix molecular orbitals with the substrate surface state to make two well-separated interfacial hybrid orbitals.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jun 30, 2017

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