研究目的
To review experimental and theoretical works on resonant tunneling spectroscopy applied to van der Waals heterostructures, focusing on angular matching of crystal lattices, conservation laws in tunneling, and multiparticle correlation effects.
研究成果
The review highlights key findings in resonant tunneling spectroscopy of van der Waals heterostructures, emphasizing the critical role of angular matching for momentum conservation, the observation of negative differential resistance and multiparticle effects like Wigner crystallization and exciton condensation. It underscores the potential for future applications in electronic devices and calls for further experimental and theoretical studies to fully understand these phenomena.
研究不足
The review is based on existing literature, so it may not cover all recent developments. Experimental limitations include difficulties in achieving precise angular alignment of layers, broadening of resonance peaks due to misorientation, and challenges in observing certain quantum effects like Wigner crystallization in graphene without magnetic fields. Theoretical models may not fully account for all multiparticle interactions.
1：Experimental Design and Method Selection:
The paper reviews various experimental setups involving van der Waals heterostructures, primarily using resonant tunneling spectroscopy to study tunneling phenomena. Theoretical models and calculations are employed to interpret results, including considerations of momentum conservation, angular misorientation, and multiparticle effects.
2：Sample Selection and Data Sources:
Samples include heterostructures made from materials like graphene, hexagonal boron nitride (h-BN), molybdenum disulfide (MoS2), and tungsten diselenide (WSe2). Data are sourced from cited experimental works, with details on fabrication methods such as mechanical detachment and transfer of flakes, and use of polymer hemispherical dies for improved angular alignment.
3：2). Data are sourced from cited experimental works, with details on fabrication methods such as mechanical detachment and transfer of flakes, and use of polymer hemispherical dies for improved angular alignment.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes heavily doped silicon substrates (Si/SiO2) serving as gates, tunneling transistors, measurement circuits for current-voltage characteristics, and magnetic field setups. Materials include graphene, h-BN, MoS2, WSe2, and various dielectrics.
4：Experimental Procedures and Operational Workflow:
Procedures involve fabricating heterostructures with controlled angular alignment, applying bias and gate voltages, measuring tunneling currents and conductances, and using magnetic fields perpendicular or parallel to layers. Data collection includes plotting current-voltage curves and conductance maps.
5：Data Analysis Methods:
Analysis involves numerical calculations based on theoretical models, comparison with experimental data, identification of resonance peaks, and interpretation of features using concepts like Landau levels, chirality conservation, and multiparticle correlations.
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