简介: |
The two-dimensional surface states of three-dimensional topological insulators such as Bi2Se3 possess a momentum space spin texture that can potentially be exploited for spintronics. This talk provides a perspective on the emergence of “topological spintronics,” demonstrating how this spin texture can be engineered using either quantum tunneling between surfaces [1] or by breaking time-reversal symmetry [2]. We then discuss recent experiments that show striking spintronic phenomena useful for proof-of-concept devices, including a spin-orbit torque of record efficiency at room temperature [3] and an electrically-gated “giant anisotropic magnetoresistance” at low temperature [4].
[1] M. Neupane, A. Richardella et al., Nature Communications 5, 3841 (2014).
[2] S.-Y. Xu et al., Nature Physics 8, 616 (2012).
[3] A. Mellnik, J. S. Lee, A. Richardella et al., Nature 511, 449 (2014).
[4] A. Kandala, A. Richardella, et al., Nature Communications (in press).
个人简介：Nitin Samarth is Downsbrough Department Head and professor of physics at Penn State University. Before joining the Penn State faculty, Samarth was a faculty fellow in physics at the University of Notre Dame. He earned his Ph.D. in physics at Purdue University and an undergraduate degree in physics at the Indian Institute of Technology in Bombay, India. Samarth is a Fellow of the American Physical Society and a Fellow of the American Association for the Advancement of Science. His awards include Outstanding Physics Alumnus Award from Purdue University, the Faculty Scholar Medal in the Physical Sciences from Penn State and the Atherton Award for Excellence in Teaching from Penn State. Samarth’s research interests center on semiconductor spintronics, nanomagnetism and topological insulators, with expertise in MBE growth, nanofabrication, magneto-transport and magneto-optics.
|
