Thanks to the light-induced collective oscillations of free charges at the boundary between a conducting material and a dielectric, known as surface plasmon resonance, metallic nanostructures can exhibit strong light absorption and scattering. The sensitivity of these resonances to the local environment and shape of the metallic structures allows them to be used, for example, in chemical sensing and cancer therapy. Semiconductor and metal-oxide nanoparticles expand possible wavelengths of surface plasmon resonances into the infrared spectrum and can possibly allow for coupling of the surface plasmon resonances of the nanoparticle, which are of classical nature, to the particle’s semiconductor band structure, which arises from quantum states of the charge carriers. These charge carriers are the electron-hole pairs known as excitons in the semiconductor.
We have recently developed a new method to produce doped transparent-metal-oxide plasmonic nanocrystals and used these to demonstrate for the first time a plasmon-exciton coupling in any plasmonic semiconductor system. Our goal in this project is to further explore the plasmon-exciton coupling in semiconductor and metal-oxide nanostructures and to develop methods to use this coupling for plasmon control of the quantum states of single defects and for their entanglement. We expect this will open the door for these systems to be deployed in quantum sensing and computing applications. In particular, we believe our studies will lead to the design of inexpensive and highly sensitive magneto-optical sensors for thermal imaging and molecular sensing.
Distributing Multimode Entanglement with Microwave Photons
Microwaves have enabled numerous classical technologies, in part because they propagate through air with little energy loss.
March 6, 2017
Spin Generation and High-Frequency Detection via the Quantum Nonlinear Anomalous Hall Effect in Weyl Semimetals
In magnetic conductors, the passage of current yields an electric field in the transverse direction even without an external magnetic field – this is known as the anomalous Hall effect (AHE). This effect can act as a convenient probe of spin ordering, magnetic textures, spin-orbit coupling, and band topology in solids, and can be further […]
April 19, 2023
Reliably operating noisy quantum computers
Summary The overall goal of the project is to develop practical methods to be able to reliably run useful applications on near-term quantum computers. This requires identifying and overcoming the ubiquitous errors that currently limit quantum computing capabilities. Traditional methods of quantifying errors in quantum computers fail to predict how errors affect the output of […]
January 22, 2020
Combined momentum- and real-space photoelectric probes of dimensionality-tuned Weyl semimetals
Summary The library of two-dimensional (2D) materials has recently grown to include topological insulators and semimetals. Their incorporation in special device geometries may lead to novel quantum electronics with enhanced functionalities. Weyl semimetals, in particular, offer the most robust form of topological protection. Recent results from our group indicate that Weyl nodes should be […]
March 12, 2019