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8 papers · 2 filters
Theory of dynamic nuclear polarization and feedback in quantum dots
Sophia E. Economou, Edwin Barnes
An electron confined in a quantum dot interacts with its local nuclear spin environment through the hyperfine contact interaction. This interaction combined with external control a…
Graphene Nanoribbon Field-Effect Transistors on Wafer-Scale Epitaxial Graphene on SiC substrates
Wan Sik Hwang, Pei Zhao, Kristof Tahy +11
We report the realization of top-gated graphene nanoribbon field effect transistors (GNRFETs) of ~10 nm width on large-area epitaxial graphene exhibiting the opening of a band gap…
Photoluminescence in array of doped semiconductor nanocrystals
K. V. Reich, Tianran Chen, Al. L. Efros +1
We study the dependence of the quantum yield of photoluminescence of a dense, periodic array of semiconductor nanocrystals (NCs) on the level of doping and NC size. Electrons intro…
Strong Hyperfine-Induced Modulation of an Optically-Driven Hole Spin in an InAs Quantum Dot
Samuel G. Carter, Sophia E. Economou, Alex Greilich +4
Compared to electrons, holes in InAs quantum dots have a significantly weaker hyperfine interaction that leads to less dephasing from nuclear spins. Thus many recent studies have s…
Sensitive Room-Temperature Terahertz Detection via Photothermoelectric Effect in Graphene
Xinghan Cai, Andrei B. Sushkov, Ryan J. Suess +10
Terahertz (THz) radiation has uses from security to medicine; however, sensitive room-temperature detection of THz is notoriously difficult. The hot-electron photothermoelectric ef…
Polarization selection rules for inter-Landau level transitions in epitaxial graphene revealed by infrared optical Hall effect
P. Kühne, V. Darakchieva, J. D. Tedesco +8
We report on polarization selection rules of inter-Landau level transitions using reflection-type optical Hall effect measurements from 600 to 4000 cm-1 on epitaxial graphene grown…