Dimensional reduction at a quantum critical point

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dc.creatorSebastian, S. E.
dc.creatorHarrison, N.
dc.creatorBatista, C. D.
dc.creatorBalicas, L.
dc.creatorJaime, M.
dc.creatorSharma, P. A.
dc.creatorKawashima, N.
dc.creatorFisher, I. R.
dc.date2006-06-01
dc.date.accessioned2026-07-07T07:12:21Z
dc.date.available2026-07-07T07:12:21Z
dc.descriptionCompetition between electronic ground states near a quantum critical point (QCP) - the location of a zero-temperature phase transition driven solely by quantum-mechanical fluctuations - is expected to lead to unconventional behaviour in low-dimensional systems. New electronic phases of matter have been predicted to occur in the vicinity of a QCP by two-dimensional theories, and explanations based on these ideas have been proposed for significant unsolved problems in condensed-matter physics, such as non-Fermi-liquid behaviour and high-temperature superconductivity. But the real materials to which these ideas have been applied are usually rendered three-dimensional by a finite electronic coupling between their component layers; a two-dimensional QCP has not been experimentally observed in any bulk three-dimensional system, and mechanisms for dimensional reduction have remained the subject of theoretical conjecture. Here we show evidence that the Bose-Einstein condensate of spin triplets in the three-dimensional Mott insulator BaCuSi2O6 provides an experimentally verifiable example of dimensional reduction at a QCP. The interplay of correlations on a geometrically frustrated lattice causes the individual two-dimensional layers of spin-1/2 Cu2+ pairs (spin dimers) to become decoupled at the QCP, giving rise to a two-dimensional QCP characterized by power law scaling distinctly different from that of its three-dimensional counterpart. Thus the very notion of dimensionality can be said to acquire an 'emergent' nature: although the individual particles move on a three-dimensional lattice, their collective behaviour occurs in lower-dimensional space.
dc.description14 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0606042
dc.identifierhttp://arxiv.org/abs/cond-mat/0606042
dc.identifierNature Vol. 441, pp 617-620 (2006)
dc.identifierdoi:10.1038/nature04732
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/112057
dc.subjectStrongly Correlated Electrons
dc.titleDimensional reduction at a quantum critical point
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