1,186 research outputs found
Phase separation and pair condensation in a spin-imbalanced 2D Fermi gas
We study a two-component quasi-two-dimensional Fermi gas with imbalanced spin
populations. We probe the gas at different interaction strengths and
polarizations by measuring the density of each spin component in the trap and
the pair momentum distribution after time of flight. For a wide range of
experimental parameters, we observe in-trap phase separation characterized by
the appearance of a spin-balanced condensate surrounded by a polarized gas. Our
momentum space measurements indicate pair condensation in the imbalanced gas
even for large polarizations where phase separation vanishes, pointing to the
presence of a polarized pair condensate. Our observation of zero momentum pair
condensates in 2D spin-imbalanced gases opens the way to explorations of more
exotic superfluid phases that occupy a large part of the phase diagram in lower
dimensions
Evolution of Fermion Pairing from Three to Two Dimensions
We follow the evolution of fermion pairing in the dimensional crossover from
3D to 2D as a strongly interacting Fermi gas of Li atoms becomes confined
to a stack of two-dimensional layers formed by a one-dimensional optical
lattice. Decreasing the dimensionality leads to the opening of a gap in
radio-frequency spectra, even on the BCS-side of a Feshbach resonance. The
measured binding energy of fermion pairs closely follows the theoretical
two-body binding energy and, in the 2D limit, the zero-temperature mean-field
BEC-BCS theory.Comment: 5 pages, 4 figure
Probing quench dynamics across a quantum phase transition into a 2D Ising antiferromagnet
Simulating the real-time evolution of quantum spin systems far out of
equilibrium poses a major theoretical challenge, especially in more than one
dimension. We experimentally explore the dynamics of a two-dimensional Ising
spin system with transverse and longitudinal fields as we quench it across a
quantum phase transition from a paramagnet to an antiferromagnet. We realize
the system with a near unit-occupancy atomic array of over 200 atoms obtained
by loading a spin-polarized band insulator of fermionic lithium into an optical
lattice and induce short-range interactions by direct excitation to a low-lying
Rydberg state. Using site-resolved microscopy, we probe the correlations in the
system after a sudden quench from the paramagnetic state and compare our
measurements to exact calculations in the regime where it is possible. We
achieve many-body states with longer-range antiferromagnetic correlations by
implementing a near-adiabatic quench and study the buildup of correlations as
we cross the quantum phase transition at different rates
Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
The coupling of the spin of electrons to their motional state lies at the
heart of recently discovered topological phases of matter. Here we create and
detect spin-orbit coupling in an atomic Fermi gas, a highly controllable form
of quantum degenerate matter. We reveal the spin-orbit gap via spin-injection
spectroscopy, which characterizes the energy-momentum dispersion and spin
composition of the quantum states. For energies within the spin-orbit gap, the
system acts as a spin diode. To fully inhibit transport, we open an additional
spin gap, thereby creating a spin-orbit coupled lattice whose spinful band
structure we probe. In the presence of s-wave interactions, such systems should
display induced p-wave pairing, topological superfluidity, and Majorana edge
states
Determination of the anti-diabetic effect of methanolic extract of Sphaeranthus indicus L. on alloxan induced diabetic rabbits
The aim of present study was to determine the anti-diabetic effect of methanolic extract of Sphaeranthus indicus L. (SMe) in alloxan induced diabetic rabbits. It was further aimed to determine the effect of SMe on various biochemical parameters, namely blood glucose levels, total cholesterol, lipoproteins (HDL and LDL), liver functions (SGOT and SGPT), serum creatinine and urea level in alloxan induced diabetic rabbits. Rabbits were divided into five groups: one non-diabetic control, treated with vehicle and four experimental (diabetic) groups. The experimental groups can be described as diabetic negative control, treated with vehicle, diabetic positive control, treated with 80 mg/kg of diamicron, a reference drug; and diabetic treated with 150 or 300 mg/kg of SMe. Pre- and post-experimental lipid profile, liver function and kidney function of rabbits was determined. The SMe at the dose of 300 mg/Kg body weight significantly (p 0.05).Colegio de Farmacéuticos de la Provincia de Buenos Aire
Determination of the anti-diabetic effect of methanolic extract of Sphaeranthus indicus L. on alloxan induced diabetic rabbits
The aim of present study was to determine the anti-diabetic effect of methanolic extract of Sphaeranthus indicus L. (SMe) in alloxan induced diabetic rabbits. It was further aimed to determine the effect of SMe on various biochemical parameters, namely blood glucose levels, total cholesterol, lipoproteins (HDL and LDL), liver functions (SGOT and SGPT), serum creatinine and urea level in alloxan induced diabetic rabbits. Rabbits were divided into five groups: one non-diabetic control, treated with vehicle and four experimental (diabetic) groups. The experimental groups can be described as diabetic negative control, treated with vehicle, diabetic positive control, treated with 80 mg/kg of diamicron, a reference drug; and diabetic treated with 150 or 300 mg/kg of SMe. Pre- and post-experimental lipid profile, liver function and kidney function of rabbits was determined. The SMe at the dose of 300 mg/Kg body weight significantly (p 0.05).Colegio de Farmacéuticos de la Provincia de Buenos Aire
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