Electrically charged particles, such as the electron, are ubiquitous. In contrast, no elementary particles with a net magnetic charge have ever been observed, despite intensive and prolonged searches ( see ref. 1 for example). We pursue an alternative strategy, namely that of realizing them not as elementary but rather as emergent particles - that is, as manifestations of the correlations present in a strongly interacting many- body system. The most prominent examples of emergent quasiparticles are the ones with fractional electric charge e/3 in quantum Hall physics(2). Here we propose that magnetic monopoles emerge in a class of exotic magnets known collectively as spin ice(3-5): the dipole moment of the underlying electronic degrees of freedom fractionalises into monopoles. This would account for a mysterious phase transition observed experimentally in spin ice in a magnetic field(6,7), which is a liquid - gas transition of the magnetic monopoles. These monopoles can also be detected by other means, for example, in an experiment modelled after the Stanford magnetic monopole search(8).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据