研究目的
Investigating the photovoltaic effect generated by spin-orbit interactions in a junction comprising two spin-orbit coupled weak links connecting a quantum dot to two electronic terminals.
研究成果
The study demonstrates that a time-dependent Rashba interaction can generate a DC electric current in an unbiased junction, leading to a photovoltaic effect. This effect is due to the loss of unitarity in spin transmission caused by inelastic processes, which differ for electrons approaching the junction from opposite directions. The predicted voltage drop due to this effect is measurable and could be significant for applications in spin-based electronics.
研究不足
The study is theoretical and requires experimental validation. The effect is dependent on the junction's mirror reflection symmetry being broken and the specific conditions of the Rashba interaction and AC electric field.
1：Experimental Design and Method Selection:
The study proposes applying an AC electric field to a junction with two spin-orbit coupled weak links connected to a quantum dot and two electronic terminals. The methodology involves analyzing the DC current and voltage drop generated due to the photovoltaic effect.
2：Sample Selection and Data Sources:
The model system consists of a quantum dot connected by two weak links to left and right reservoirs, with the Rashba interaction induced by external electric fields.
3：List of Experimental Equipment and Materials:
The setup involves a quantum dot, weak links with spin-orbit coupling, and electronic terminals. The Rashba interaction is induced by AC electric fields.
4：Experimental Procedures and Operational Workflow:
The study involves applying an AC electric field to the junction and measuring the induced DC current and voltage drop. The analysis includes considering the effects of inelastic processes on electron reflection.
5：Data Analysis Methods:
The Keldysh technique is used to express the particle current in terms of the Green's function on the dot, with the DC current calculated using Bessel functions and the Breit-Wigner resonance formula.
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