Physics

Tunable spin and conductance in porphyrin-graphene nanoribbon hybrids

F. Gao, R. E. Menchón, et al.

This research, conducted by Fei Gao, Rodrigo E. Menchón, Aran Garcia-Lekue, and Mads Brandbyge, delves into the fascinating electronic and transport properties of porphyrin-graphene nanoribbon hybrids. Discover how these materials could redefine spintronics and chemical sensing with their intriguing spin polarization effects and sensitivity to mechanical strain!

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Playback language: English

Index

Abstract

This research explores the electronic and transport properties of porphyrin-graphene nanoribbon (Por-GNR) hybrids using first-principles calculations. Two experimentally feasible Por-GNR structures are investigated: hybrid1 (straight) and hybrid2 (S-shaped). Hybrid2 exhibits a small band gap, making it suitable for electronic devices. Incorporating an iron atom into the porphyrin center induces spin polarization (S=1 ground state). A two-terminal device setup with Fe-hybrid2 sandwiched between H2-hybrid2 electrodes reveals spin-polarized Fano anti-resonances, making conductance highly sensitive to the Fe spin state. Mechanical strain or CO adsorption on the Fe atom lead to spin crossover (S=2 and S=0, respectively), directly impacting transmission. The findings highlight the potential of Por-GNRs for spintronics and chemical sensing.

Publisher

Communications Physics

Published On

May 23, 2023

Authors

Fei Gao, Rodrigo E. Menchón, Aran Garcia-Lekue, Mads Brandbyge

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