Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session H25: Topological Materials for Conversion between Charge and Spin CurrentsInvited
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Sponsoring Units: GMAG DCMP Chair: Sadamichi Maekawa, Tohoku Univ Room: LACC 403B |
Tuesday, March 6, 2018 2:30PM - 3:06PM |
H25.00001: Conversion between spin and charge currents by Rashba or Topological Insulator interfaces and perspective for low power spintronic devices Invited Speaker: Albert Fert The locking between spin and momentum degrees of freedom in the 2D states of topological insulator (TI) and Rashba interfaces opens interesting perspectives for the conversion between charge and spin currents [1], which, parenthetically, is the basic function for the creation or detection of spin currents in any spintronic devices. |
Tuesday, March 6, 2018 3:06PM - 3:42PM |
H25.00002: Spin-charge conversion induced by spin pumping into topological materials Invited Speaker: Yuki Shiomi Topological materials are promising candidates for novel spintronics devices which enable highly efficient spin-charge conversion, because spin direction and charge-flow direction are frequently coupled in topological materials owing to the strong spin-orbit interaction. In this presentation, we will give a talk on spin-charge conversion effects induced by spin pumping into two topological systems: (i) surfaces of topological insulators (Bi,Sb)2(Te,Se)3 and Sn-Bi2Te2Se [1,2]; and (ii) a Tl-Pb monolayer material [3]. |
Tuesday, March 6, 2018 3:42PM - 4:18PM |
H25.00003: Spin charge interconversion at surfaces of the topological insulator Bi-Sb-Te and the weyl antiferromagnet Mn3Sn Invited Speaker: Yoshichika Otani Spin Hall effects are commonly utilized to interconvert between charge and spin currents. As an alternative mechanism for this interconversion, the spin-momentum locking at the Bi (111)/Ag interface [1] or the at the Dirac surface state of a topological insulator (TI) have recently been used for highly efficient interconversion [2]. |
Tuesday, March 6, 2018 4:18PM - 4:54PM |
H25.00004: Spin and charge conversion in topological surface states and oxide interface states Invited Speaker: Wei Han Spin and charge conversion has attracted a lot of interest in the field of spintronics. Two major mechanisms have been utilized to do the spin and charge conversion are spin Hall effect and Edelstein effect. For Edelstein effect, it refers to spin current conversion from charge current flowing in inversion asymmetric two-dimensional electron gases (2DEGs) with large Rashba spin orbit coupling. |
Tuesday, March 6, 2018 4:54PM - 5:30PM |
H25.00005: Topological Spintronics Invited Speaker: Nitin Samarth Tetradymite narrow bandgap semiconductors (Bi2Te3, Bi2Se3, Sb2Te3, and their alloys) are known to support topologically protected, two dimensional (2D) helical Dirac fermion surface states characterized by a spin-texture in momentum space [1]. The 'spin-momentum locking' of the 2D surface states in these three dimensional (3D) 'topological insulators' lends itself naturally to 'topological spintronics,' device applications that might exploit efficient spin-charge interconversion. We present an introductory overview of the emergence of 'topological spintronics' and then focus on recent experiments that probe spin-charge interconversion at the interface between a 3D topological insulator and an insulating ferrimagnet [2], with a view toward understanding how the spin Hall conductivity in topological insulators varies with chemical potential [3]. An important issue examined in this context is the relative contribution to spin-charge conversion of the surface and bulk states, both of which have large spin-orbit coupling in the tetradymites. Finally, we address emerging demonstrations of spin-orbit torque switching using topological insulator/ferromagnetic metal heterostructures [4]. |
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