scholarly journals Phases and collective modes of a hardcore Bose-Fermi mixture in an optical lattice

2009 ◽  
Vol 79 (11) ◽  
Author(s):  
S. Sinha ◽  
K. Sengupta
Keyword(s):  
Optical Lattice ◽  
Collective Modes

scholarly journals Collective Modes of an Ultracold6Li-40K Mixture in an Optical Lattice

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Z. G. Koinov
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Optical Lattice ◽  
Random Phase ◽  
Fermi Gas ◽  
Functional Integral ◽  
Low Energy ◽  
Collective Modes ◽  
Legendre Transform ◽  
Goldstone Mode

A low-energy theory of the Nambu-Goldstone excitation spectrum and the corresponding speed of sound of an interacting Fermi mixture of Lithium-6 and Potassium-40 atoms in a two-dimensional optical lattice at finite temperatures with the Fulde-Ferrell order parameter has been formulated. It is assumed that the two-species interacting Fermi gas is described by the one-band Hubbard Hamiltonian with an attractive on-site interaction. The discussion is restricted to the BCS side of the Feshbach resonance where the Fermi atoms exhibit superfluidity. The quartic on-site interaction is decoupled via a Hubbard-Stratonovich transformation by introducing a four-component boson field which mediates the Hubbard interaction. A functional integral technique and a Legendre transform are used to give a systematic derivation of the Schwinger-Dyson equations for the generalized single-particle Green’s function and the Bethe-Salpeter equation for the two-particle Green’s function and the associated collective modes. The numerical solution of the Bethe-Salpeter equation in the generalized random phase approximation shows that there exist two distinct sound velocities in the long-wavelength limit. In addition to low-energy (Goldstone) mode, the two-species Fermi gas has a superfluid phase revealed by two roton-like minima in the asymmetric collective-mode energy.

Density waves in disk galaxies

1967 ◽  
Vol 31 ◽  
pp. 313-317 ◽  
Author(s):  
C. C. Lin ◽  
F. H. Shu
Keyword(s):  
Mathematical Analysis ◽  
Spiral Structure ◽  
Stellar System ◽  
Collective Modes ◽  
Disk Galaxies ◽  
Spiral Pattern ◽  
Density Waves ◽  
The Galaxy ◽  
Detailed Mathematical Analysis

Density waves in the nature of those proposed by B. Lindblad are described by detailed mathematical analysis of collective modes in a disk-like stellar system. The treatment is centered around a hypothesis of quasi-stationary spiral structure. We examine (a) the mechanism for the maintenance of this spiral pattern, and (b) its consequences on the observable features of the galaxy.

Dynamics and spatial order of atoms confined in an optical lattice

1997 ◽  
Vol 44 (10) ◽  
pp. 1853-1862
Author(s):  
A. GORLITZ , T. HANSCH and A. HEMMERIC
Keyword(s):  
Optical Lattice ◽  
Spatial Order

COLLECTIVE MODES IN ARRAYS OF SUPERCONDUCTING BRIDGES

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-588-C6-590 ◽  
Author(s):  
S. N. Artemenko ◽  
A. F. Volkov ◽  
A. V. Zaitsev
Keyword(s):  
Collective Modes

Prediction of momentum distribution of supercooled atoms in optical lattice using convolutional-recurrent network

2020 ◽  
Vol 28 (7) ◽  
pp. 1480-1484
Author(s):  
Yun-hong LI ◽  
◽  
Hong-hao LI ◽  
Da WEN ◽  
Fan-su WEI ◽  
...  
Keyword(s):  
Momentum Distribution ◽  
Optical Lattice ◽  
Recurrent Network

Probing Bloch oscillations using a slow-light sensor

2020 ◽  
Vol 9 (5) ◽  
pp. 243-246
Author(s):  
Pei-Chen Kuan ◽  
Chang Huang ◽  
Shau-Yu Lan
Keyword(s):  
Phase Shift ◽  
Optical Lattice ◽  
Cold Atoms ◽  
Slow Light ◽  
Internal State ◽  
Electromagnetically Induced Transparency ◽  
Bloch Oscillations ◽  
Bloch Oscillation ◽  
Induced Transparency ◽  
Transparency Condition

AbstractWe implement slow-light under electromagnetically induced transparency condition to measure the motion of cold atoms in an optical lattice undergoing Bloch oscillation. The motion of atoms is mapped out through the phase shift of light without perturbing the external and internal state of the atoms. Our results can be used to construct a continuous motional sensor of cold atoms.

scholarly journals Quantum droplets of bosonic mixtures in a one-dimensional optical lattice

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Ivan Morera ◽  
Grigori E. Astrakharchik ◽  
Artur Polls ◽  
Bruno Juliá-Díaz
Keyword(s):  
Optical Lattice ◽  
One Dimensional
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