Macroscopic Klein tunneling in spin-orbit-coupled Bose-Einstein condensates
Abstract
We propose an experimental scheme to detect macroscopic Klein tunneling with spin-orbit-coupled Bose-Einstein condensates (BECs). We show that a nonlinear Dirac equation with tunable parameters can be realized with such BECs. Through numerical calculations, we demonstrate that macroscopic Klein tunneling can be clearly detected under realistic conditions. Macroscopic quantum coherence in such relativistic tunneling is clarified and a BEC with a negative energy is shown to be able to transmit transparently through a wide Gaussian potential barrier.
- Publication:
-
Physical Review A
- Pub Date:
- January 2012
- DOI:
- 10.1103/PhysRevA.85.013628
- arXiv:
- arXiv:1104.0444
- Bibcode:
- 2012PhRvA..85a3628Z
- Keywords:
-
- 03.75.Mn;
- 03.65.Pm;
- 03.75.Lm;
- 71.70.Ej;
- Multicomponent condensates;
- spinor condensates;
- Relativistic wave equations;
- Tunneling Josephson effect Bose-Einstein condensates in periodic potentials solitons vortices and topological excitations;
- Spin-orbit coupling Zeeman and Stark splitting Jahn-Teller effect;
- Condensed Matter - Quantum Gases;
- Quantum Physics
- E-Print:
- 6 pages