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.
Physicists have used ultracold atoms to imitate the behavior of electrons in a solid. Researchers 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 behavior of electrons in a solid, which enables the investigation of magnetic properties.
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.
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 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. Eg 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 only 4 atoms, for their quantum simulation. The atoms are held in a laser light trap that allows movement in only 1 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, 1 up, 1 down. This brings about an antiferromagnetic state.”
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.” http://www.uni-heidelberg.de/presse/news2015/pm20151120_quantum_simulation_magnetism.html
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