Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-25
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Related papers at http://pettagroup.princeton.edu
Scientific paper
Bi2Se3 is a strong topological insulator (TI) with a single Dirac cone and chiral spin texture. Surface-sensitive probes have directly accessed the topological surface states, but transport measurements have proven diffcult due to bulk contributions to the conductivity. Efforts aimed at isolating surface transport properties have focused on mechanical exfoliation, electrical gating, and chemical doping. An alternative way to minimize bulk contributions to the conductivity is to synthesize nanostructures with a large surface-to-volume ratio. We demonstrate the controlled synthesis of Bi2Se3 nanostructures with large surface-to-volume ratio using metal-organic chemical vapor deposition (MOCVD), a standard process for large scale production of semiconductor compounds. Simple adjustment of the reactor parameters allows us to obtain highly ordered nanoribbons up to 10 microns long or thin micron sized platelets. The method can be readily extended to produce doped or ternary compounds, enabling future TI transport measurements, efforts to isolate Majorana Fermions, and the development of new thermoelectric materials.
Alegria L. D.
Chatterjee Arnab
Patel Sandeep Kumar
Petta J. R.
Poirier G. R.
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