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Tapio Simula

As seen in: Physical Review B
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Articles

Fluctuation theorem anomaly in a point-vortex fluid

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By Rama Sharma, Tapio Simula, Andrew J. Groszek
| Physical Review B
The second law of thermodynamics posits that in closed macroscopic systems the rate of entropy production must be positive. However, small systems can exhibit negative entropy production over short timescales, seemingly in contradiction with this law. The fluctuation theorem quantitatively connects these two limits, predicting that entropy-producing trajectories become exponentially dominant as the system size and measurement time are increased.
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Two Nambu-Goldstone zero modes for rotating Bose-Einstein condensates

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By Tapio Simula
| Physical Review B
Abstract We consider rotating finite-size vortex arrays in Bose-Einstein condensates that are confined by cylindrically symmetric external potentials. We show that such systems possess two exact Nambu-Goldstone zero modes associated with two spontaneously broken continuous symmetries of the system. We verify our analytical result via direct numerical diagonalizations of the Bogoliubov–de Gennes equations.
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Geometric phases of a vortex in a superfluid

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By Andrew J. Groszek, St Lucia, Tapio Simula
| Physical Review B
Abstract We consider geometric phases of mobile quantum vortices in superfluid Bose–Einstein condensates (BECs). Haldane and Wu [Phys. Rev. Lett. 55, 2887 (1985)] showed that the geometric phase, γC=2πNC, of such a vortex is determined by the number of condensate atoms NC enclosed by the vortex trajectory. Considering an experimentally realistic freely orbiting vortex leads to an apparent disagreement with this prediction.
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