Aharonov–Bohm-like effects and Fano resonances in circular DNA molecular junctions

DNA electronics has reattracted great interest in recent years and showed a number of fascinating phenomena. Here, we present a theoretical study of electron transport through a two-terminal circular DNA junction under a perpendicular magnetic field. Our results indicate that this circular DNA exhib...

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Veröffentlicht in:Applied physics letters 2022-10, Vol.121 (15)
Hauptverfasser: Hu, Pei-Jia, Fang, Tie-Feng, Guo, Ai-Min, Sun, Qing-Feng
Format: Artikel
Sprache:eng
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Zusammenfassung:DNA electronics has reattracted great interest in recent years and showed a number of fascinating phenomena. Here, we present a theoretical study of electron transport through a two-terminal circular DNA junction under a perpendicular magnetic field. Our results indicate that this circular DNA exhibits Aharonov–Bohm-like effects and a semiconductor–insulator–semiconductor transition by tuning this magnetic field, with the transmission spectrum nearly oscillating periodically. Interestingly, Fano resonances appear around integer multiples of the magnetic flux quantum accompanied by several vortices of local currents. Moreover, the circular DNA behaves as a nanoscale switch, and this switching effect is robust and could be improved for longer molecular length and weaker molecule–electrode coupling, with the on/off ratio exceeding 104 for long circular DNA. These results may help for designing novel circular DNA-based molecular devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0118229