Quantum geometry enabled opto-electronics of the fermi surface

• Main Author: Zhang, Nuoya
• Other Authors: Justin Song Chien Wen
• Format: Final Year Project
• Language: English
• Published: Nanyang Technological University 2023
• Subjects: Science::Physics
• Online Access: https://hdl.handle.net/10356/166545
• Institution: Nanyang Technological University

This work studies the working principles of a quantum geometry based intraband solar cell. This study derives the group velocity and the anomalous velocity under the effect of electric field via wave packet analysis. Through the wave packet analysis, this work also derives the Berry curvature, Berry connection polarizability and their relating effects in the motion of electrons. Then this work derives various resulting rectified current perturbatively. After producting the the oscillating electric field from radiation and the applied constant electric field in the circuit, the input radiation power, the output circuit power, and the energy conversion efficiency in the energy harvester device is derived. Furthermore, this work investigates the performance of various powers under time reversal symmetry and parity-time symmetry. Lastly, this work examines the performance of a parity-time symmetric system via numerical computing and provides possible ways to improve the efficiency.