研究目的
Investigating the heat generation by spin-polarized current in a quantum dot device attached to ferromagnetic leads under the influence of a photon field.
研究成果
The study concludes that the heat generation by spin-polarized current in a quantum dot device can be effectively tuned by the photon field and the ferromagnetism of the leads. It provides a method to generate large spin-polarized current with weak heat, which is beneficial for designing low energy consumption spintronic devices.
研究不足
The study is theoretical and relies on the non-equilibrium Green function technique, which may have limitations in accurately modeling all physical aspects of the system. The practical implementation of such a device may face challenges in controlling the precise conditions required for the observed phenomena.
1：Experimental Design and Method Selection:
The study uses the non-equilibrium Green function technique to analyze heat generation in a quantum dot device. The device is subjected to a phonon bath and a photon field, with the dot level split by a Zeeman effect due to an applied magnetic field.
2：Sample Selection and Data Sources:
The system consists of a quantum dot molecule connected to two ferromagnetic leads. The parameters include the phonon frequency, the strength and frequency of the photon field, and the spin polarization of the leads.
3：List of Experimental Equipment and Materials:
Quantum dot device, ferromagnetic leads, phonon bath, photon field source, magnetic field source.
4：Experimental Procedures and Operational Workflow:
The study involves calculating the spin-dependent time-averaged heat generation and electric current under various conditions of photon frequency and leads' ferromagnetism.
5：Data Analysis Methods:
The analysis involves plotting the electric current and heat generation versus the bias voltage and the dot level for different photon frequencies and leads' spin polarizations.
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