ar X iv : c on d - m at / 9 80 22 47 v 1 2 4 Fe b 19 98 Excitation spectrum and instability of a two - species Bose - Einstein condensate

نویسنده

  • D. Gordon
چکیده

We numerically calculate the density profile and excitation spectrum of a two-species Bose-Einstein condensate for the parameters of recent experiments. We find that the ground state density profile of this system becomes unstable in certain parameter regimes, which leads to a phase transition to a new stable state. This state displays spontaneously broken cylindrical symmetry. This behavior is reflected in the excitation spectrum: as we approach the phase transition point, the lowest excitation frequency goes to zero, indicating the onset of instability in the density profile. Following the phase transition, this frequency rises again.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

ar X iv : n uc l - th / 9 80 20 74 v 1 2 4 Fe b 19 98 Partial U A ( 1 ) Restoration from Bose - Einstein Correlations

The effective intercept parameter of the two-pion Bose-Einstein Correlation function, λ * , is found to be sensitive to partial restoration of U A (1) symmetry in ultra-relativistic nuclear collisions. An increase in the yield of the η ′ meson, proposed earlier as a signal of partial U A (1) restoration, is shown to create a " hole " in the low p t region of λ *. A comparison with NA44 data [1]...

متن کامل

ar X iv : c on d - m at / 9 80 53 27 v 1 2 5 M ay 1 99 8 Measurements of Relative Phase in Binary Mixtures of Bose - Einstein Condensates

We have measured the relative phase of two Bose-Einstein condensates (BEC) using a time-domain separated-oscillatory-field condensate interferometer. A single two-photon coupling pulse prepares the double condensate system with a well-defined relative phase; at a later time, a second pulse reads out the phase difference accumulated between the two condensates. We find that the accumulated phase...

متن کامل

ar X iv : c on d - m at / 0 40 40 80 v 1 [ co nd - m at . s of t ] 4 A pr 2 00 4 Bogoliubov excitation spectrum in anharmonic traps

We study the linearized Bogoliubov excitation spectrum of infinitely long anharmonically trapped Bose-Einstein condensates, with the aim of overcoming inhomogeneous broadening. We compare the Bogoliubov spectrum of a harmonic trap with that of a theoretical flat-bottom trap and find a dramatic reduction in the inhomogeneous broadening of the lineshape of Bogoliubov excitations. While the Bragg ...

متن کامل

ar X iv : c on d - m at / 0 50 22 99 v 2 1 7 Fe b 20 05 Depletion of the Bose - Einstein condensate in Bose - Fermi mixtures

We describe the properties of a mixture of fermionic and bosonic atoms, as they are tuned across a Feshbach resonance associated with a fermionic molecular state. Provided the number of fermionic atoms exceeds the number of bosonic atoms, we argue that there is a critical detuning at which the Bose-Einstein condensate (BEC) is completely depleted. The phases on either side of this quantum phase...

متن کامل

ar X iv : c on d - m at / 0 40 73 63 v 3 2 9 Ju n 20 05 Einstein - Podolsky - Rosen correlations via dissociation of a molecular Bose - Einstein condensate

Recent experimental measurements of atomic intensity correlations through atom shot noise suggest that atomic quadrature phase correlations may soon be measured with a similar precision. We propose a test of local realism with mesoscopic numbers of massive particles based on such measurements. Using dissociation of a Bose-Einstein condensate of diatomic molecules into bosonic atoms, we demonstr...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1998