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Ferromagnetic spin coupling as the origin of 0.7 anomaly in quantum point contacts.
Phys Rev Lett
February 2009
Department of Physics, SUNY at Buffalo, Buffalo, New York 14260, USA.
We study one-dimensional itinerant electron models with ferromagnetic coupling to investigate the origin of the 0.7 anomaly in quantum point contacts. Linear conductance calculations from the quantum Monte Carlo technique for spin interactions of different spatial range suggest that 0.
View Article and Find Full Text PDFNonequilibrium quantum phase transition in itinerant electron systems.
Phys Rev Lett
October 2005
Department of Physics, Brown University, Providence, Rhode Island 02912, USA.
We study the effect of the voltage bias on the ferromagnetic phase transition in a one-dimensional itinerant electron system. The applied voltage drives the system into a nonequilibrium steady state with a nonzero electric current. The bias changes the universality class of the second order ferromagnetic transition.
View Article and Find Full Text PDFFerromagnetic transition in one-dimensional itinerant electron systems.
Phys Rev Lett
August 2004
Department of Physics, Florida State University, Tallahassee 32306, USA.
We use bosonization to derive the effective field theory that properly describes ferromagnetic transition in one-dimensional itinerant electron systems. The resultant theory is shown to have dynamical exponent z = 2 at tree level and upper critical dimension dc = 2. Thus one dimension is below the upper critical dimension of the theory, and the critical behavior of the transition is controlled by an interacting fixed point, which we study via epsilon expansion.
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