2016/04/04 by Kei Yamamoto, K. T. Yamamoto, Y. Shiomi +5
Physics and Astronomy · #Condensed matter physics #Electricity #Energy conversion efficiency #Geometry #Insulator (electricity) #Magnetic properties of thin films #Materials science #Optoelectronics #Physics #Quantum and electron transport phenomena #Scaling #Spin (aerodynamics) #Surface (topology) #Surface states #Topological Materials and Phenomena #Topological insulator #Voltage #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.94.024404
published as Phys. Rev. B 94, 024404 (2016)
arxiv created 2016/04/04 · openalex publication_date 2016/07/05 · arxiv updated 2016/07/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have investigated spin-electricity conversion on surface states of bulk-insulating topological insulator (TI) materials using a spin-pumping technique. The sample structure is Ni-Fe\ensuremath|Cu\ensuremath|TI trilayers, in which magnetic proximity effects on the TI surfaces are negligibly small owing to the inserted Cu layer. Voltage signals produced by the spin-electricity conversion are clearly observed and are enhanced with decreasing temperature, in line with the dominant surface transport at lower temperatures. The efficiency of the spin-electricity conversion is greater for TI samples with a higher resistivity of bulk states and longer mean free path of surface states, consistent with the surface spin-electricity conversion.