研究目的
Investigating the effects of photoexcitation on the superconducting proximity effect in a graphene-based Josephson junction.
研究成果
The study demonstrated that the critical current in a graphene-based Josephson junction can be controlled by photoexcitation, with the electron temperature in graphene being proportional to the illumination power to the one-third power. This indicates that photogenerated non-equilibrium carrier dynamics are responsible for the variation of the critical current with illumination power, suggesting potential applications in superconducting optoelectronic devices.
研究不足
The study was limited to a single wavelength of light (1.31 lm) and did not explore the effects of varying wavelengths. Additionally, the sample's response to higher illumination powers was not fully characterized.
1：Experimental Design and Method Selection:
The study involved illuminating a superconductor/monolayer graphene/superconductor (SGS) Josephson junction with monochromatic light at a wavelength of
2：31 lm to study the superconducting proximity effect under photoexcitation. Sample Selection and Data Sources:
The SGS junction was fabricated on a highly p-doped Si substrate with a thermally oxidized SiO2 layer. Monolayer graphene was prepared by mechanical exfoliation of kish graphite, and a Ti/Al/Ti trilayer was used as the superconducting electrodes.
3：List of Experimental Equipment and Materials:
The sample was mounted in a dilution refrigerator. Light from the laser diode operated in the continuous wave (CW) mode at the wavelength k ?
4：31 lm was guided to the SGS junction through optical ?bers. Experimental Procedures and Operational Workflow:
The current-voltage (IV) characteristics were measured as a function of the back gate voltage Vbg, the illumination power Ptot, and the bath temperature Tbath.
5：Data Analysis Methods:
The critical current Ic and normal state resistance Rn were analyzed as functions of illumination power and bath temperature to understand the effects of photoexcitation on the superconducting state.
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