Jonah Waissman, Maayan Honig, Sharon Pecker, Avishai Benyamini, Assaf Hamo, Shahal Ilani
Recent years have seen the development of several experimental systems capable of tuning local parameters of quantum Hamiltonians. Examples include ultracold atoms, trapped ions, superconducting circuits, and photonic crystals. Condensed matter analogues, where fermionic statistics and strong interactions occur naturally, remain challenging to implement due to the inevitable existence of electronic disorder in the solid state. Here, we demonstrate a new technology for deterministic creation of locally-tunable, ultra-low-disorder electron systems in carbon nanotubes suspended over circuits of unprecedented complexity. Using transport experiments we show that electrons can be localized at any position along the nanotube and smoothly shuttled from location to location. Nearly perfect mirror symmetry of transport characteristics about the center of the tube establishes the negligible effects of electronic disorder. Our system thus allows experiments in engineered one-dimensional potentials with spatial resolution limited only by the density of gates. We further demonstrate the ability to position multiple nanotubes at chosen separations, generalizing these devices to coupled one-dimensional systems. These new capabilities open the door to a broad spectrum of new experiments on electronics, mechanics, and spins in one dimension.
View original:
http://arxiv.org/abs/1302.2921
No comments:
Post a Comment