TY - BOOK

T1 - Growth and Low Temperature Transport Measurements of Pure and Doped Bismuth Selenide

AU - Mlack, Jerome Thomas

PY - 2016

Y1 - 2016

N2 - Strong spin orbit materials have become especially interesting due to their potential forapplications in spintronics, novel transistors, and the search for Majorana fermions. In orderto fully take advantage of these materials they must be thoroughly studied. This workfocuses on the material Bi2Se3, which is a strong spin orbit material and a topological insulator.I describe a synthesis technique and low-temperature transport measurements ofnanostructures of Bi2Se3, that when annealed with palladium show evidence of superconductivity.The growth method is a catalyst-free atmospheric pressure vapor-solid growth.The growth method yields a variety of nanostructures, and materials analysis shows orderedstructures of bismuth selenide in all cases. Low-temperature measurements of as-grownnanostructures indicate tunable carrier density in all samples. By doping the nanostructureswith palladium via annealing, the transport properties of the samples can be altered toexhibit superconductivity. Thin films of palladium are deposited on prefabricated Bi2Se3nanodevices and annealed at temperatures in excess of 100 Celsius. We find that Bi2Se3absorbs Pd under these conditions and that the absorption of Pd results in evidence of superconductivity,as shown by transport measurements measurements below 1K.

AB - Strong spin orbit materials have become especially interesting due to their potential forapplications in spintronics, novel transistors, and the search for Majorana fermions. In orderto fully take advantage of these materials they must be thoroughly studied. This workfocuses on the material Bi2Se3, which is a strong spin orbit material and a topological insulator.I describe a synthesis technique and low-temperature transport measurements ofnanostructures of Bi2Se3, that when annealed with palladium show evidence of superconductivity.The growth method is a catalyst-free atmospheric pressure vapor-solid growth.The growth method yields a variety of nanostructures, and materials analysis shows orderedstructures of bismuth selenide in all cases. Low-temperature measurements of as-grownnanostructures indicate tunable carrier density in all samples. By doping the nanostructureswith palladium via annealing, the transport properties of the samples can be altered toexhibit superconductivity. Thin films of palladium are deposited on prefabricated Bi2Se3nanodevices and annealed at temperatures in excess of 100 Celsius. We find that Bi2Se3absorbs Pd under these conditions and that the absorption of Pd results in evidence of superconductivity,as shown by transport measurements measurements below 1K.

UR - https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122097118005763

M3 - Ph.D. thesis

BT - Growth and Low Temperature Transport Measurements of Pure and Doped Bismuth Selenide

PB - The Niels Bohr Institute, Faculty of Science, University of Copenhagen

ER -