TY - JOUR
T1 - Nonmagnetic single-molecule spin-filter based on quantum interference
AU - Pal, Atindra Nath
AU - Li, Dongzhe
AU - Sarkar, Soumyajit
AU - Chakrabarti, Sudipto
AU - Vilan, Ayelet
AU - Kronik, Leeor
AU - Smogunov, Alexander
AU - Tal, Oren
N1 - O.T. appreciates the support of the Harold Perlman family, and acknowledges funding by a research grant from Dana and Yossie Hollander, the Israel Science Foundation (grant number 1089/15), and the Minerva Foundation (grant number 120865). A.S. and D.L. performed calculations using HPC computation resources from TGCC-GENCI (Grant No. A0040910407). L.K. is the incumbent of the Aryeh and Minzti Katzman Professorial Chair and appreciates the support of the Harold Perlman family. Contributions: A.N.P. performed conductance and shot-noise experiments and analysis. S.C. performed conductance experiments and analysis. A.V. carried out conductance analysis. The mentioned experimental work was carried out under the guidance of O.T., D.L. and A.S. performed spin-polarized DFT calculations (QE), as well as tight-binding and model transport simulations. S.S. and L.K. carried out spin-polarized DFT calculations (SIESTA, VASP) and transport calculations (TRANSIESTA). All the authors participated in discussions and co-wrote the paper.
PY - 2019/12/5
Y1 - 2019/12/5
N2 - Key spin transport phenomena, including magnetoresistance and spin transfer torque, cannot be activated without spin-polarized currents, in which one electron spin is dominant. At the nanoscale, the relevant length-scale for modern spintronics, spin current generation is rather limited due to unwanted contributions from poorly spin-polarized frontier states in ferromagnetic electrodes, or too short length-scales for efficient spin splitting by spin-orbit interaction and magnetic fields. Here, we show that spin-polarized currents can be generated in silver-vanadocene-silver single molecule junctions without magnetic components or magnetic fields. In some cases, the measured spin currents approach the limit of ideal ballistic spin transport. Comparison between conductance and shot-noise measurements to detailed calculations reveals a mechanism based on spin-dependent quantum interference that yields very efficient spin filtering. Our findings pave the way for nanoscale spintronics based on quantum interference, with the advantages of low sensitivity to decoherence effects and the freedom to use non-magnetic materials.
AB - Key spin transport phenomena, including magnetoresistance and spin transfer torque, cannot be activated without spin-polarized currents, in which one electron spin is dominant. At the nanoscale, the relevant length-scale for modern spintronics, spin current generation is rather limited due to unwanted contributions from poorly spin-polarized frontier states in ferromagnetic electrodes, or too short length-scales for efficient spin splitting by spin-orbit interaction and magnetic fields. Here, we show that spin-polarized currents can be generated in silver-vanadocene-silver single molecule junctions without magnetic components or magnetic fields. In some cases, the measured spin currents approach the limit of ideal ballistic spin transport. Comparison between conductance and shot-noise measurements to detailed calculations reveals a mechanism based on spin-dependent quantum interference that yields very efficient spin filtering. Our findings pave the way for nanoscale spintronics based on quantum interference, with the advantages of low sensitivity to decoherence effects and the freedom to use non-magnetic materials.
UR - http://www.scopus.com/inward/record.url?scp=85076102772&partnerID=8YFLogxK
U2 - 10.1038/s41467-019-13537-z
DO - 10.1038/s41467-019-13537-z
M3 - مقالة
SN - 2041-1723
VL - 10
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 5565
ER -