A new joint innovation by the National Physical Laboratory (NPL) and the University of Cambridge could pave the way for redefining the ampere in terms of fundamental constants of physics. The world's first graphene single-electron pump (SEP), described in Nature Nanotechnology, provides the speed of electron flow needed to create a new standard for electrical current based on electron charge.
The international system of units (SI) comprises seven base units. Ideally, these should be stable over time and universally reproducible. This requires definitions based on fundamental constants of nature which are the same wherever you measure them.
The present definition of the ampere, however, is vulnerable to drift and instability. This is not sufficient to meet the accuracy needs of present and certainly future electrical measurement. The highest global measurement authority, the Conférence Générale des Poids et Mesures, has proposed that the ampere be redefined in terms of the electron charge.
The front-runner in this race to redefine the ampere is the SEP. SEPs create a flow of individual electrons by shuttling them in to a quantum dot—a particle holding pen—and emitting them one at a time and at a well-defined rate. The paper in Nature Nanotechnology describes how a graphene SEP has been successfully produced and characterized for the first time, and confirms its properties are extremely well suited to this application.
A good SEP pumps precisely one electron at a time to ensure accuracy, and pumps them quickly to generate a sufficiently large current. Up to now the development of a practical electron pump has been a two-horse race. Tuneable barrier pumps use traditional semiconductors and have the advantage of speed, while the hybrid turnstile utilizes superconductivity and has the advantage that many can be put in parallel. Traditional metallic pumps, thought to be not worth pursuing, have been given a new lease of life by fabricating them out of the world's most famous super-material—graphene.
Previous metallic SEPs made of aluminum are very accurate, but pump electrons too slowly for making a practical current standard. Graphene's unique semi-metallic 2D structure has just the right properties to let electrons on and off the quantum dot very quickly, creating a fast enough electron flow—at near gigahertz frequency—to create a current standard. The Achilles' heel of metallic pumps, slow pumping speed, has thus been overcome by exploiting the unique properties of graphene.
More work is required to optimize the material and make more accurate measurements, but the paper in Nature Nanotechnology marks a major step forward in the road towards using graphene to redefine the ampere.
The realization of the ampere is currently derived indirectly from resistance or voltage, which can be realized separately using the quantum Hall effect and the Josephson Effect. A fundamental definition of the ampere would allow a direct realization that National Measurement Institutes around the world could adopt. This would shorten the chain for calibrating current-measuring equipment, saving time and money for industries billing for electricity and using ionizing radiation for cancer treatment.
Current, voltage and resistance are directly correlated. Because we measure resistance and voltage based on fundamental constants—electron charge and Planck's constant—being able to measure current would also allow us to confirm the universality of these constants on which many precise measurements rely.
Graphene is not the last word in creating an ampere standard. NPL and others are investigating various methods of defining current based on electron charge, but graphene SEPs could hold the answer. Also, any redefinition will have to wait until the kilogram has been redefined. This definition, due to be decided soon, will fix the value of electronic charge, on which any electron-based definition of the ampere will depend.
This innovation will also have important implications beyond measurement. Accurate SEPs operating at high frequency and accuracy can be used to make electrons collide and form entangled electron pairs. Entanglement is believed to be a fundamental resource for quantum computing, and for answering fundamental questions in quantum mechanics.
Source: National Physical Laboratory