Ground state phases in Rashba-Dresselhaus spin-orbit-coupled Bose-Einstein condensates

2020 ◽  
Author(s):  
R. Ravisankar ◽  
T. Sriraman ◽  
P. Muruganandam
Keyword(s):  
Ground State ◽  
Spin Orbit ◽  
Bose Einstein ◽  
Ground State Phases

scholarly journals Influence of Rashba spin-orbit and Rabi couplings on the spin-mixing and ground state phases of binary Bose-Einstein condensates

2021 ◽  
Author(s):  
Ravisankar Rajamanickam ◽  
Sriraman Thangarasu ◽  
Ramavarmaraja Kishor Kumar ◽  
Muruganandam Paulsamy ◽  
Pankaj Kumar Mishra
Keyword(s):  
Phase Transition ◽  
Plane Wave ◽  
Parameter Space ◽  
Ground State ◽  
Coupling Strength ◽  
Coupling Parameter ◽  
Spin Orbit ◽  
Interspecies Interactions ◽  
Bose Einstein ◽  
Ground State Phases

Abstract We study the miscibility properties and ground state phases of two-component spin-orbit (SO) coupled Bose-Einstein condensates (BECs) in a harmonic trap with strong axial confinement. By numerically solving the coupled Gross-Pitaevskii equations in the two-dimensional setting, we analyze the SO-coupled BECs for two possible permutations of the intra- and interspecies interactions, namely (i) weak intra- and weak interspecies interactions (W-W) and (ii) weak intra- and strong interspecies interactions (W-S). Considering the density overlap integral as a miscibility order parameter, we investigate the miscible-immiscible transition by varying the coupling parameters. We obtain various ground state phases, including plane wave, half quantum vortex, elongated plane wave, and different stripe wave patterns for W-W interactions. For finite Rabi coupling, an increase in SO coupling strength leads to the transition from the fully miscible to the partially miscible state. We also characterize different ground states in the coupling parameter space using the root mean square sizes of the condensate. The spin density vector for the ground state phases exhibits density, quadrupole and dipole like spin polarizations. For the W-S interaction, in addition to that observed in the W-W case, we witness semi vortex, mixed mode, and shell-like immiscible phases. We notice a wide variety of spin polarizations, such as density, dipole, quadrupole, symbiotic, necklace, and stripe-like patterns for the W-S case. A detailed investigation in the coupling parameter space indicates immiscible to miscible state phase transition upon varying the Rabi coupling for a fixed Rashba SO coupling. The critical Rabi coupling for the immiscible-miscible phase transition decreases upon increasing the SO coupling strength.

scholarly journals Ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates

2018 ◽  
Vol 97 (2) ◽  
Author(s):  
Naoki Irikura ◽  
Yujiro Eto ◽  
Takuya Hirano ◽  
Hiroki Saito
Keyword(s):  
Ground State ◽  
Bose Einstein ◽  
Ground State Phases
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