Unexpected magnetism explained in Cu/Cu2O-rGO nanocomposite

The observation of room temperature ferromagnetism along with a low temperature paramagnetic counterpart in undoped Cu-Cu2O-rGO nanocomposite was demonstrated. A phenomenological approach was taken to explain the observations based on 3D Ising model for arbitrary spins generated due to Cu vacancy in the Cu2O system preferably at the interface

Electromagnetically Induced Transparency (EIT) aided cooling of strontium atoms

The presence of ultra-narrow inter-combination spectroscopic lines in alkaline earth elements places them as promising candidates for optical atomic clocks, quantum computation, and for probing fundmental physics. Doppler cooling of these atoms is typically achieved through two subsequent stages: the initial cooling is on the 1s0-1p1 transition followed by cooling using the narrow-line 1s0-3p1 transition. However, due to significantly lower linewidth of the second stage cooling transition, efficient transfer of atoms into the second stage becomes technically challenging. The velocity distribution of the atoms after the first stage of cooling is too broad for atoms to be captured efficiently in the second stage cooling. As a result, the capture efficiency of atoms into the second stage Magneto-Optical Trap is low, even if the linewidth of the second stage cooling laser is artificially broadened.Comment: 7 pages, 3 figure

Comparative analysis of phase noise for different configurations of Bragg lattice for an atomic gravimeter with Bose–Einstein condensate

We perform a comparative study of the phase noise induced in the lasers used for Bragg diffraction in a Bose–Einstein condensate-based quantum gravimeter where the Bragg beams are generated using two different configurations. In one of the configurations, the Bragg beams that form the moving optical lattice are generated using two different acousto-optic modulators. In the second configuration, the Bragg beams are generated using a single acousto-optic modulator carrying two phase-locked frequencies. The second configuration shows a suppression of the phase noise by a factor of 4.7 times in the frequency band up to 10 kHz, the primary source of noise, which is the background acoustic noise picked up by optical components and the optical table. We report a short-term sensitivity of 1360μGal/Hz and upon integration over 200 s, achieve a resolution of 99.7 μGal for an interferometric duration of 10 ms