We have studied the tunability of the interaction between permanent dipoles in Bose-Einstein condensates. Based on time-dependent control of the anisotropy of the dipolar interaction, we show that even the very weak magnetic dipole coupling in alkali gases can be used to excite collective modes. Furthermore, we discuss how the effective dipolar coupling in a Bose-Einstein condensate can be tune...

The nitrogen nuclear quadrupole coupling in borazine is reported and interpreted in combina­ tion with the previously measured boron coupling. A novel Townes-Dailey type of analysis was employed to obtain the electron distribution in borazine. A calculated rc-donation of ~ 0.5 e from the nitrogen atom to the vacant rc-orbital of boron is accompanied by a strong polarisation of the er-skeleton, ...

Double meson production of the eta and pion at the threshold region is investigated in order to determine chiral property of the nucleon. The eta can be used as a probe for the negative parity nucleon N ≡ N(1535) produced in the intermediate state. The coupling of the low energy pion in the final state is then used to extract the sign of the Yukawa coupling, gπN∗N∗ , which distinguishes the two...

The first test of the Kugo-Ojima colour confinement criterion by the lattice Landau gauge QCD simulation is performed. The parameter u which is expected to be −1δ b in the continuum theory was found to be −0.7δ b in the strong coupling region. The data is analysed in connection with the theory of Zwanziger. In the weak coupling region, the expectation value of the horizon function is negative o...

At a critical “chiral” coupling, topologically massive gravity with a negative cosmological constant exhibits several unusual features, including the emergence of a new logarithmic branch of solutions and a linearization instability for certain boundary conditions. I show that at this coupling, the linearized theory may be parametrized by a free scalar field at the Breitenlohner-Freedman bound,...

Patients: One hundred one healthy subjects of both sexes. Results: We found that the met allele was associated with a dose-dependent increase in hippocampal formation and ventrolateral prefrontal cortex activation during viewing of faces displaying negative emotion. In met/met homozygotes, limbic and prefrontal regions showed increased functional coupling. Moreover, in these same subjects, the ...

Abstract The two-dimensional van der Waals (vdW) magnets retaining magnetic order in atomically thin limit demonstrate challenging physical phenomena and they are considered as prospective building blocks for construction of advanced spintronics nanoelectronics devices. Here, we present experimental evidence negative thermal expansion lattice volume vdW layers strong spin–phonon coupling effect...