Tarr-Coyne Professor of Applied Physics and Electrical Engineering
John A. Paulson School of Engineering and Applied Sciences
“Where Imperfections Lead to Opportunities: “Defects” as Solid-State Qubits”
Monday, November 7, 2022 – 5:30 PM EDT
We often make the natural assumption that a “perfectly structured” material is required to produce “perfect functioning” of a device, where the function may relate to precision sensing, or the storing or transmission of information. Recently, however, there has been excitement about the performance of defects in crystalline semiconductors such as diamond and SiC. The defects, such as vacancies or “missing atoms” are deviations from perfect, periodic crystalline order. Yet such defects can manifest optical emission at a variety of wavelengths, distinctively coupled to long spin coherence times. With a general introduction to such “perfectly imperfect” materials, this talk will highlight our studies in 4H-SiC of defects (qubits), integrated within photonic amplifiers. This integrated system not only enhances the qubit signal, but also can serve as a “nanoscope” into the material, allowing us to learn about the details of their atomic environment. The correlated photonic and spin behavior of such defects will be discussed.