In Praise of Unstable Fixed Points: The Way Things Actually Work

Details In Praise of Unstable Fixed Points: The Way Things Actually Work In Praise of Unstable Fixed Points: The Way Things Actually Work

2002-01-23

arxiv.org/abs/cond-mat/0201431v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 figures

Scientific paper

10.1016/S0921-4526(02)00770-6

In recent years a fashion has grown up to ascribe great importance to ``quantum critical points'' at T=0, at the boundary between the basins of attraction to the stable fixed points of ordered ground states. I argue that more physical significance in connecting microscopic interactions with observed phenomena lies in the common phenomenon of partially ordered ``liquid'' states at higher temperatures, unstable phases which define the relevant degrees of freedom and may order in many different ways as the temperature is further lowered.

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