We report magneto-transport studies of topological insulator Bi2Te3 thin films grown by pulsed laser deposition. A non-saturating linear-like magneto-resistance (MR) is observed at low temperatures in the magnetic field range from a few Tesla up to 60 Tesla. We demonstrate that the strong linear-like MR at high field can be well understood as the weak antilocalization phenomena described by Hikami-Larkin-Nagaoka theory. Our analysis suggests that in our system, a topological insulator, the elastic scattering time can be longer than the spin-orbit scattering time. We briefly discuss our results in the context of Dirac Fermion physics and ‘quantum linear magnetoresistance’.
We observed non-saturating linear-like magnetoreisistance in topological
insulator Bi2Te3 thin films from a few T up to 60 T at low temperatures. Due to the larger Fermi surface, the magnetic field is not high enough to reach Abrikosov’s quantum limit where all the surface Dirac Fermions are quantized into the lowest Landau level. We demonstrate that the strong linear-like MR at high fields can be well understood as the weak antilocalization phenomena described by Hikami-Larkin-Nagaoka theory. Our analysis suggests that in our topological insulator, the elastic scattering time is longer than the spin-orbit scattering time. The non-saturating linear-like MR observed here up to 60 T suggests many potential applications for topological insulators, including high-field magnetic sensor technology.
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
Known for identifying cutting edge technologies, he is currently a Co-Founder of a startup and fundraiser for high potential early-stage companies. He is the Head of Research for Allocations for deep technology investments and an Angel Investor at Space Angels.
A frequent speaker at corporations, he has been a TEDx speaker, a Singularity University speaker and guest at numerous interviews for radio and podcasts. He is open to public speaking and advising engagements.