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

Jingying Wang, Andrew Deloach, Wei Jiang, Christopher M. Papa, Mykhaylo Myahkostupov, Felix N. Castellano, Feng Liu, Daniel B. Dougherty

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

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.

Original languageEnglish (US)
Article number241410
JournalPhysical Review B
Volume95
Issue number24
DOIs
StatePublished - Jun 30 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

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