abstract
Chirality-induced spin selectivity (CISS) has been observed in a wide range of helical systems. Here, we report spin-selective electron transport through two-dimensional (2D) self-assembled molecular networks (SAMNs) formed by an enantiopure organic semiconductor with chiral alkyl side chains [dinaphtho[2,3-b:2',3 '-f]thieno[3,2-b]thiophene (DNTT)] adsorbed on a magnetic substrate with perpendicular anisotropy. Scanning tunneling microscopy and scanning tunneling spectroscopy (STM and STS) were used to directly visualize the molecular arrangement on ferromagnetic surfaces and to measure the spin-dependent electron transport at the solution/solid interface, respectively. A comparison of enantiomorphous SAMNs under identical experimental conditions revealed an enantiospecific magnetic conductance asymmetry (EMA) exceeding 40% at room temperature. These asymmetries were observed when either the molecular enantiomer was changed or the magnetization direction was switched. Our results indicate that the CISS effect is also operative in nonhelical, one-atom-thick systems where the chirality is expressed in 2D, unlocking exciting opportunities for both fundamental research and practical applications.
keywords
POLARIZATION
subject category
Chemistry
authors
Rana, S; Remigio, M; Geetha, LA; Strutynski, K; Volpi, M; John, S; Baczewski, LT; Paltiel, Y; Resel, R; Melle-Franco, M; Mali, KS; Geerts, YH; De Feyter, S
our authors
Karol Strutyński
Assistant Researcher
Manuel Melle-Franco
Principal ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
S.R. acknowledges the Marie Sk & lstrok;odowska-Curie individual postdoctoral fellowship (grant number 101107281) and a postdoctoral fellowship from FWO-MSCA-SoE (12ZZO23N). The authors thank the Belgian National Fund for Scientific Research (FNRS) for financial support through research projects: Pi-Fast PDR T.0072.18, PICHIR PDR T.0094.22, CHIRI CDR J.0088.24, CISSCA WEAVE T.W.023.23, and CHISUB EOS no. 40007495. M. M-F. and K.S. thank the support from CICECO-Aveiro Institute of Materials, UIDB/50011/2020 (DOI 10.54499/UIDB/50011/2020), UIDP/50011/2020 (DOI 10.54499/UIDP/50011/2020), and LA/P/0006/2020 (DOI 10.54499/LA/P/0006/2020) project financed by national funds through FCT/MCTES (PIDDAC). K.S. acknowledges funding from the Scientific Employment Stimulus Program (2022.07534.CEECIND). Some of the calculations were done on the Navigator platform, UC-LCA, funded by FCT I.P. under the Advanced Computing Project 2023.10649.CPCA.A2.