Physics of quantized vortices and "new" superfluid turbulence

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We study theoretically and experimentally quantum hydrodynamics in quantum condensed phases at low temperature, namely superfluid helium and atomic Bose-Einstein condensates (BECs). Quantum turbulence (QT) is a main topic in the studies of superfluid helium, in which the energy spectrum is shown numerically to obey the Kolmogorov law that is the most important statistical law in turbulence. The experiments using vibrating wires reveal the transition to QT free from remnant vortices, which was consistent with the numerical simulation using the vortex filament model. For atomic BECs, we study theoretically and numerically various kinds of hydrodynamic instability caused by topological defects (quantized vortices). Using two combined precessions, we show that QT can be created in this system too.