Article
Unconventional BoseEinstein condensations from spinorbit coupling
Chinese Physics Letters (Impact Factor: 0.92). 09/2008; DOI: 10.1088/0256307X/28/9/097102
Source: arXiv

Article: Two and threedimensional topological insulators with isotropic and paritybreaking Landau levels
[Show abstract] [Hide abstract]
ABSTRACT: We investigate topological insulating states in both two and three dimensions with the harmonic potential and strong spinorbit couplings breaking the inversion symmetry. Landaulevellike quantization appear with the full two and threedimensional rotational symmetry and timereversal symmetry. Inside each band, states are labeled by their angular momenta over which energy dispersions are strongly suppressed by spinorbit coupling, to being nearly flat. The radial quantization generates energy gaps between neighboring bands at the order of the harmonic frequency. Helical edge or surface states appear on open boundaries characterized by the Z2 index. These Hamiltonians can be viewed from the dimensional reduction of the highdimensional quantum Hall states in three and fourdimensional flat spaces. These states can be realized with ultracold fermions inside harmonic traps with synthetic gauge fields.Physical review. B, Condensed matter 03/2012; 85(12). · 3.77 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In recent pioneer experiment, a strong spinorbit coupling, with equal Rashba and Dresselhaus strengths, has been created in a trapped BoseEinstein condensate. Moreover, many exotic superfluid phenomena induced by this strong spinorbit coupling have been predicted. In this report, we show that this novel spinorbit coupling has important applications in quantum metrology, such as spin squeezing. We first demonstrate that an effective spinspin interaction, which is the heart for producing spin squeezing, can be generated by controlling the orbital degree of freedom (i.e., the momentum) of the ultracold atoms. Compared with previous schemes, this realized spinspin interaction has advantages of no dissipation, high tunability, and strong coupling. More importantly, a giant squeezing factor (lower than 30 dB) can be achieved by tuning a pair of Raman lasers in current experimental setup. Finally, we find numerically that the phase factor of the prepared initial state affects dramatically on spin squeezing.Scientific Reports 01/2013; 3:3166. · 5.08 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this paper, we prove analytically that the planewave BoseEinstein condensates with spinorbit coupling are stable in two dimensions at zero temperature. The SOC induced extra breaking of the O(2) symmetry of the ground state makes the goldstone modes more divergent in the infrared limit. But the depletions are still finite, which means the condensates are stable.The European Physical Journal D 67(3). · 1.51 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.