JH Group

Electronic/Spintronic/Photonic Meta-Materials

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This program involves the extension of traditional solid-state top-down patterning techniques to sub-lithographic dimensions. For example, several projects will revolve around the fabrication of arrays of magnetic tunnel junctions at densities up to 10¹¹ bits/cm² (0.5 TBit/in²). In addition, this same approach can be used to study the behavior of artificially constructed meta-materials patterned on length scales that are not accessible via other techniques.

Sub-lithographic Patterning

Bottom-up Solid State Synthesis

This program relies on the bottom-up assembly of solid-state nanostructures through vapor-liquid-solid (VLS) templated epitaxial growth. This effort focuses on the synthesis of novel axial and radial nanowire heterostructures in the III-As,P material system with an emphasis on the inclusion of magnetic impurities and ferromagnetic semiconductor functionality. In addition, it benefits from the advances in sub-lithographic patterning discussed above through, for example, programmed assembly of catalyst particles at ~ 10 nm length scales.

Molecular Spin-Transport

This program involves the exploration of charge and spin transport in magnetically active molecular systems, and their integration with solid-state electronic materials. This approach allows for the inclusion of chemistry-based functionality as well as providing highly scalable functional elements for nanoscale electronics. As promising molecular materials are identified, their scaling properties are explored via incorporation in hybrid molecular/ solid-state tunnel junctions at sub-lithographic densities using both existing techniques as well as those developed in the correlated programs above.

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