Sodium iridate (Na2IrO3) is a spin-orbit assisted Mott insulator and in the frame work of the Kitaev-Heisenberg model holds exotic physics with possible applications in quantum computation. We have integrated thin crystal into nanoelectronic devices and through electronic trans- port measurements we have identified the dominate transport mechanism as Mott variable range hopping (VRH). Complementary angle-resolved photoemission spectroscopy (ARPES) measure- ments on cleaved samples of Na2IrO3 show a non-zero density of states near the Fermi energy that mediates VRH characteristic of the bulk. Raman experiments in our thin crystals shows Ra- man active modes consistent with the bulk. Through transport we observe a trace of a change in the transport mechanism in a temperature region near 15 K, the magnetic ordering temperature reported for the bulk crystal.
|Commitee:||Kwon, Chuhee, Papp, Zoltan|
|School:||California State University, Long Beach|
|Department:||Physics and Astronomy|
|School Location:||United States -- California|
|Source:||MAI 81/4(E), Masters Abstracts International|
|Keywords:||Condensed matter physics, Correlated materials, Electronic transport, Kitaev materials, Mott insulator, Nanodevices|
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