研究目的
To investigate the role of the electronic component of polaritons in the magneto-transport of a coupled light-matter system and to show how coupling to a Terahertz (THz) resonator modifies the linear direct current resistivity.
研究成果
The study presents a new platform for directly accessing the material part of a light matter coupled system and shows that magneto-transport carries signatures of the vacuum field fluctuation mediated by the polaritons. Future work includes in-situ manipulation of the electromagnetical environment for more direct measurement of the effects of vacuum fields.
研究不足
The theoretical model is spin-degenerate, while in the measurements the spin splitting starts at around 0.6T, leading to some differences between theory and experiment.
1：Experimental Design and Method Selection:
The study involves coupling a two-dimensional electron gas (2DEG) under strong magnetic field with complementary THz split ring resonators to achieve ultrastrong light-matter coupling.
2：Sample Selection and Data Sources:
A GaAs/AlGaAs quantum well with specific electron density and mobility is used.
3：List of Experimental Equipment and Materials:
Hall bar geometry for measuring resistivity, Ge/Ni/Au for ohmic contacts, and THz split ring resonators.
4：Experimental Procedures and Operational Workflow:
Magneto-transport measurements are performed with and without external illumination using a dilution refrigerator and a widely tunable single frequency sub-THz source.
5：Data Analysis Methods:
The data is analyzed using theoretical models based on the Hamiltonian of the coupled system and linear response (Kubo formula) perturbation theory.
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