Tuning interfacial spin filters from metallic to resistive within a single organic semiconductor family
2017; American Physical Society; Volume: 95; Issue: 24 Linguagem: Inglês
10.1103/physrevb.95.241410
ISSN2469-9977
AutoresJingying Wang, Andrew S. DeLoach, Wei Jiang, Christopher M. Papa, Mykhaylo Myahkostupov, Felix N. Castellano, Feng Liu, Daniel B. Dougherty,
Tópico(s)Surface Chemistry and Catalysis
ResumoA metallic spin filter is observed at the interface between $\mathrm{Al}{\mathrm{q}}_{3}$ adsorbates and a Cr(001) surface. It can be changed to a resistive (i.e., gapped) filter by substituting Cr ions to make $\mathrm{Cr}{\mathrm{q}}_{3}$ 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 $\mathrm{Al}{\mathrm{q}}_{3}$, a charge-transfer interaction with the substrate leads to a metallic spin filter. For $\mathrm{Cr}{\mathrm{q}}_{3}$, direct covalent interactions mix molecular orbitals with the substrate surface state to make two well-separated interfacial hybrid orbitals.
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