Kuklov A B, Svistunov B V
The College of Staten Island, CUNY, Staten Island, New York 10314, USA.
Phys Rev Lett. 2003 Mar 14;90(10):100401. doi: 10.1103/PhysRevLett.90.100401. Epub 2003 Mar 12.
In the Mott-insulator regime, two species of ultracold atoms in an optical lattice can exhibit the low-energy counterflow motion. We construct effective Hamiltonians for the three classes of the two-species (fermion-fermion, boson-boson, and boson-fermion-type) insulators and reveal the conditions when the resulting ground state supports super-counter-fluidity (SCF), with the alternative being phase segregation. We emphasize a crucial role of breaking the isotopic symmetry between the species for realizing the SCF phase.
在莫特绝缘体状态下，光学晶格中的两种超冷原子可以表现出低能反向流动运动。我们为两类（费米子 - 费米子、玻色子 - 玻色子和玻色子 - 费米子型）绝缘体构建了有效哈密顿量，并揭示了所得基态支持超逆流态（SCF）的条件，另一种情况是相分离。我们强调了打破物种间同位素对称性对于实现SCF相的关键作用。
