scholarly journals Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose–Einstein condensate

Nature ◽  
2006 ◽  
Vol 443 (7109) ◽  
pp. 312-315 ◽  
Author(s):  
L. E. Sadler ◽  
J. M. Higbie ◽  
S. R. Leslie ◽  
M. Vengalattore ◽  
D. M. Stamper-Kurn
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Spontaneous symmetry breaking in persistent currents of spinor polaritons

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Evgeny Sedov ◽  
Sergey Arakelian ◽  
Alexey Kavokin
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Degrees Of Freedom ◽  
Continuous Wave ◽  
Rotational Symmetry ◽  
Einstein Condensate ◽  
Persistent Currents ◽  
Optical Pump ◽  
Bose Einstein Condensate ◽  
Bose Einstein

AbstractWe predict the spontaneous symmetry breaking in a spinor Bose–Einstein condensate of exciton-polaritons (polaritons) caused by the coupling of its spin and orbital degrees of freedom. We study a polariton condensate trapped in a ring-shaped effective potential with a broken rotational symmetry. We propose a realistic scheme of generating controllable spinor azimuthal persistent currents of polaritons in the trap under the continuous wave optical pump. We propose a new type of half-quantum circulating states in a spinor system characterized by azimuthal currents in both circular polarizations and a vortex in only one of the polarizations. The spontaneous symmetry breaking in the spinor polariton condensate that consists in the switching from co-winding to opposite-winding currents in opposite spin states is revealed. It is characterized by the change of the average orbital angular momentum of the condensate from zero to non-zero values. The radial displacement of the pump spot and the polarization of the pump act as the control parameters. The considered system exhibits a fundamental similarity to a superconducting flux qubit, which makes it highly promising for applications in quantum computing.

scholarly journals Spontaneous Symmetry Breaking of Solitons Trapped in a Double-Gauss Potentials

2018 ◽  
Vol 28 (4) ◽  
pp. 301
Author(s):  
Cuong Duy Nguyen ◽  
Khoa Xuan Dinh ◽  
Van Long Cao ◽  
Trippenbach M. ◽  
Thuan Dinh Bui ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Chemical Potential ◽  
Propagation Constant ◽  
Pseudospectral Method ◽  
Einstein Condensate ◽  
Extended Model ◽  
Bose Einstein Condensate ◽  
The Stability ◽  
Bose Einstein

We consider an extended model of the model considered before with double-square potential, namely one-dimensional (1D) nonlinear Schrödinger equation (NLSE) with self-focusing nonlinearity and a 1D double-gauss potential. Spontaneous symmetry breaking has been presented in terms of the control parameter which is propagation constant in the case of optics and chemical potential in the of Bose-Einstein Condensate (BEC), correspondingly. The numerical simulations predict a bifurcation breaking the symmetry of 1D trapped in the double-gauss potential of the supercritical type as in the case of double-square potential. Furthermore we have constructed bifurcation diagrams considering the stability of solitons with three methods: the method using Vakhitov–Kolokolov (V-K) Stability Criterion, Pseudospectral Method and Method for Linear-Stability Eigenvalues. It will be shown that for our model the results obtained are the same for these three methods but the third one is the fastest.

scholarly journals Symmetry breaking and tunneling dynamics of a dipolar Bose–Einstein condensate in a double-well potential

2018 ◽  
Vol 96 (6) ◽  
pp. 622-626 ◽  
Author(s):  
Yuan Sheng Wang ◽  
Ping Long ◽  
Bo Zhang ◽  
Hong Zhang
Keyword(s):  
Symmetry Breaking ◽  
Long Range ◽  
Three Dimensional ◽  
Dipolar Interaction ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Symmetry Properties ◽  
Tunneling Dynamics ◽  
Bose Einstein ◽  
Double Well Potential

We investigate the properties of a three-dimensional (3D) dipolar Bose–Einstein condensate (BEC) in a double-well potential (DWP). Symmetry breaking and tunneling dynamics phenomena are demonstrated for 164Dy atoms in the 3D DWP using an effective two-mode model. The results show that the symmetry properties of the dynamics are affected markedly by the long-range nature and anisotropy of the dipolar interaction and the isotropic contact interaction.

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