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Publications

Prof. Zonghoon Lee’s Atomic-Scale Electron Microscopy Lab

Publications

Link to Google Scholar


Publications in Nature | Science | their sister journals


Nature, 582, 511-514, 2020 / Nature Nanotechnology, 15, 289-295, 2020 / Nature Nanotechnology, 15, 59-66, 2020 / Science Advances, 6 (10), eaay4958, 2020 / Nature Electronics, 3, 207-215, 2020 / Nature Communications, 11 (1437), 2020 / Nature Energy, 3, 773-782, 2018 / Nature Communications, 8:1549, 2017 / Nature Communications, 6:8294, 2015 / Nature Communications, 6:7817, 2015 / Nature Communications, 5:3383, 2014




Abstract


We report the doping effect of a magnetic Fe ion in Bi2Te3, that is, Bi2−xFexTe3 (x = 0, 0.08, 0.15, 0.2, 0.25, and 0.3). The paramagnetic magnetization data reveal that the Fe ions are doped in the divalent form. The Fe2+ state substituted for Bi3+ can create hole donors, which compensate for the electron dopants of Bi2Te3 with a small amount of Te excess. This causes the n-type carrier density to be decreased with increasing x, and finally be changed to p type at x = 0.3, where the carrier mobility suddenly drops and the electrical resistivity abruptly increases. These results are consistent with angle-resolved photoemission spectroscopy experiments. The Fermi level shifts downward with increasing x. Furthermore, we find a larger spin polarization for the Fe-doped Bi2Te3 samples, which is crucial for future spintronics applications. 

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2011

Prior to Joining UNIST, 2011

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