Researchers have reported the creation of pseudo-magnetic fields far stronger than the strongest magnetic fields ever sustained in a laboratory - just by putting the right kind of strain onto a patch of graphene (a sheet made from a single layer of carbon atoms). The finding, reported in Science, adds to graphene's growing list of experimental surprises.

"We have shown experimentally that when graphene is stretched to form nanobubbles on a platinum substrate, electrons behave as if they were subject to magnetic fields in excess of 300 tesla, even though no magnetic field has actually been applied," says Michael Crommie, from Berkeley National Laboratory. "This is a completely new physical effect that has no counterpart in any other condensed matter system."

Previously, it was difficult to sustain tremendously strong magnetic fields in a laboratory setting. The current record is 85 tesla for a field that lasts only thousandths of a second. When stronger fields are created, the magnets blow themselves apart.

The ability to make electrons behave as if they were in magnetic fields of 300 tesla or more - just by stretching graphene - offers a new window on fundamental science made possible by graphene's electronic behavior, which is unlike any other material's.

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