Heidelberg physicists use ultracold atoms to imitate the behaviour of electrons in a solid
Researchers at Heidelberg University have devised a new way to study the phenomenon of magnetism. Using ultracold atoms at near absolute zero, they prepared a model that simulates the behaviour of electrons in a solid, which enables the investigation of magnetic properties.
Atoms (shown in green and blue) are held in a trap of laser light (red) in which they can move in one dimension only. The atoms can point either up (green) or down (blue), similar to a needle in a compass. When the atoms do not interact, they can move freely in the trap (top picture); they have no discernible order. When repulsive interactions between the atoms are strong (bottom picture), they arrange themselves in the trap, with each atom pointing in the opposite direction of its neighbour.
The findings of the team led by Prof. Selim Jochim of the Institute for Physics are expected to contribute to a better understanding of the fundamental processes in solids and lead to the development of new types of materials over the long term. The results of their quantum simulation research, conducted with physicists from Hannover and Lund (Sweden), appeared in the journal “Physical Review Letters”.
Magnetism has been known for over 2,000 years, and was used early on to develop the compass, whose needles align themselves with the earth's magnetic field. Nonetheless, the microscopic causes of magnetism were not understood until the development of quantum mechanics at the beginning of the 20th century.
One of the most important discoveries was that electrons in a solid behave like tiny compass needles that align themselves with an external magnetic field and also affect each other. The magnetic properties of a solid depend on how adjacent electrons arrange themselves relative to one another. For instance in ferromagnetic substances such as iron, all electrons point in the same direction. In antiferromagnetism, however, each electron points in the opposite direction of its neighbour.
The Heidelberg physicists used very few atoms, namely four, for their quantum simulation. “Precisely preparing such a small number of atoms is a major technical undertaking. It allows us, however, to control the state of the atoms with extreme precision,” explains Simon Murmann, Prof. Jochim’s doctoral student in charge of the experiments who has just completed his thesis on the subject.
The atoms are held in a laser light trap that allows movement in only one dimension. They are subject to virtually the same physical laws as electrons in a solid, but the physicists are able to precisely control the interactions of the atoms. “Initially, there is no interaction between the atoms. In this state, they can move freely inside the trap without any fixed arrangement. But when we introduce increasing repulsion between the atoms, they can no longer pass one another and end up forming a chain. Each atom in the chain points in the opposite direction of its neighbour, one up and one down. This brings about an antiferromagnetic state,” explains the Heidelberg scientist.
This observation is of great interest to the researchers because antiferromagnetism is connected to physical phenomenon that could lead to far-reaching applications. “Superconductivity, i.e. the lossless conduction of electricity, was observed in antiferromagnetic materials at relatively high temperatures of only minus 135 degrees Celsius,” continues Selim Jochim. “We hope that our experiments will contribute to the understanding of the fundamental processes in solids. One vision is to develop new materials that will remain superconductive even at room temperature”.
For their article published in the “Physical Review Letters”, the authors received the coveted “Editors’ Suggestion” distinction.
S. Murmann, F. Deuretzbacher, G. Zürn, J. Bjerlin, S. M. Reimann, L. Santos, T. Lompe, S. Jochim: Antiferromagnetic Heisenberg Spin Chain of a Few Cold Atoms in a One-Dimensional Trap. Physical Review Letters (published online on 19 November 2015), doi: 10.1103/PhysRevLett.115.215301
Prof. Dr. Selim Jochim
Center for Quantum Dynamics
Institute for Physics
Phone +49 6221 54-19472
Kommunikation und Marketing
Tel. +49 6221 54-2311
Group of Prof. Dr. Selim Jochim – http://ultracold.physi.uni-heidelberg.de
Marietta Fuhrmann-Koch | idw - Informationsdienst Wissenschaft
Novel light sources made of 2D materials
28.10.2016 | Julius-Maximilians-Universität Würzburg
OU-led team discovers rare, newborn tri-star system using ALMA
27.10.2016 | University of Oklahoma
Physicists from the University of Würzburg have designed a light source that emits photon pairs. Two-photon sources are particularly well suited for tap-proof data encryption. The experiment's key ingredients: a semiconductor crystal and some sticky tape.
So-called monolayers are at the heart of the research activities. These "super materials" (as the prestigious science magazine "Nature" puts it) have been...
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
28.10.2016 | Power and Electrical Engineering
28.10.2016 | Life Sciences
28.10.2016 | Life Sciences