Atomically thin 2D materials constitute promising building blocks for quantum devices due to their exotic, layer-dependent electronic properties. The ability to stack these materials in alternating layers enables heterostructures to be built in almost limitless combinations and over small enough length scales to observe quantum phenomena. So far though, practical implementation of devices based on layered 2D materials has been limited by the challenges of depositing or transferring single atomically thin layers over large areas and of building multi-layers from different materials. In this project, we expand on our previously demonstrated scalable deposition techniques of films for electrochemical applications and control of defects in exfoliated 2D material flakes to build electronic and optoelectronic-based quantum devices in collaboration with Prof. Na Young Kim’s group. Our central goal is to create large area heterostructures of 2D materials built by sequential Langmuir-Blodgett (LB) deposition. We will use these heterostructures to construct simple proof-of-principle quantum devices such as resonant tunneling diodes (RTDs). The work will include finding optimized film parameters for dense, ultrathin tunneling barriers, development of patterning approaches compatible with sequential LB deposition, and ultimately demonstrating a working single, double, and multi-junction RTDs on flexible substrates. While the RTD is one of the simplest quantum devices that can be fabricated from heterostructures of 2D materials, the methodologies we establish in this project will pave the way for improved THz emitters and detectors, faster transistors and memories, and other devices that rely on similar heterostructures and design.
Entangled Photon Orbital Angular Momentum Arrays
Summary Arrays of orbital angular momentum (OAM) states of light are a new form of structured light so far relatively unexplored in quantum information science. Unlike spin angular momentum of light, which is related to light’s polarization and covers two dimensions, OAM states, sometimes described as ‘donut beams’ due to the shape of the field […]
September 19, 2019
Repurposing potential drug candidates for the treatment of COVID-19
Summary The main protease (Mpro) in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus responsible for the coronavirus disease (COVID-19), has emerged as a promising drug target. The scientific community has produced a large number of crystallographic structures of the protease, which mediates viral replication and transcription. These structures report several fragments with varied chemotypes […]
May 6, 2020
Qubits and Quantum Effects in Biology
It is unknown whether biological processes make direct use of quantum effects, as opposed to depending merely on the influence of quantum physics on chemical bonding and molecular structure.
June 1, 2017
Plasmon Control of Quantum States in Semiconductor Nanocrystals
Summary 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, […]
March 21, 2018