Length-dependent electron spin polarization in oligopeptides and DNA

DOI: 10.1021/acs.jpcc.0c02291

Authors: Suryakant Mishra (The Weizmann Institute) , Amit Kumar Mondal (The Weizmann Institute) , Shubhadeep Pal (The Weizmann Institute) , Tapan Kumar Das (The Weizmann Institute) , Eilam Z. B. Smolinsky (The Weizmann Institute) , Giuliano Siligardi (Diamond Light Source) , Ron Naaman (The Weizmann Institute)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: April 2020

Abstract: The effect of spin polarization in conduction and electric field-induced polarization was measured for double-stranded DNA oligonucleotides and oligopeptides of different lengths. The measurements were conducted using magnetic contact AFM, spin-dependent electrochemistry, spin-dependent polarization, and magnetoresistance studies. It was established that the spin-dependent conduction through chiral molecules depends on the voltage applied with a power of d, when d is larger than unity, and that there is a different voltage threshold for conducting each of the spin polarizations. In addition, there is no spin flipping during the conduction through the chiral system. The spin polarization depends linearly on the length, within the range of lengths studied, and it seems to scale like the optical activity. These results suggest the importance of the electric polarizability in the chiral-induced spin selectivity process.

Subject Areas: Chemistry, Physics


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