Colorado State University, Department of Physics
Abstract: Dirac semimetals are a recently discovered topological phase of quantum matter. α-Sn is unique among the Dirac semimetals because it is a single-element material and is therefore relatively easy to grow. Further, it can be transformed into other topological phases, such as a topological insulator or a Weyl semimetal, under strains or external fields. I will discuss our recent experimental work on α-Sn thin films along four directions: (1) Growth of α-Sn thin films by a CMOS-compatible sputtering technique. (2) Large damping enhancement in a ferromagnetic thin film due to the presence of topological surface states in an adjacent α-Sn thin film. (3) Current-induced magnetization switching via topological surface states in an α-Sn/Ag/CoFeB trilayer. (4) Spin-momentum-locking driven large magnetoresistance in α-Sn thin films that scales linearly with both magnetic and electric fields. These results indicate that topological Dirac semimetal α-Sn holds exciting promise of application in next-generation electronics and quantum technologies.
All lectures held in CoorsTek 140 unless otherwise noted