论文标题
远程跳跃和互动中无处不在的光真实空间配对
Ubiquitous light real-space pairing from long-range hopping and interactions
论文作者
论文摘要
我们系统地检查了多距离跳跃及其与扩展相互作用的协同作用会导致光对。对稀释的扩展哈伯德型号确定了一对属性，该模型具有较大的现场排斥（$ U $），以及近邻居和最新的邻居跳跃（$ t $和$ t'$）和吸引力（$ v $和$ v'$），用于立方和四方lattices。 $ t'$和$ v'$的存在促进了光对。对于四方晶格，$ t'<0 $对可以比非相互作用的颗粒和$ d $ -smmetric对的表格更轻。 Close packing transition temperatures, $T^{\ast}$ are estimated for the Bose-Einstein condensation (BEC) of pairs to be $k_{B}T^{\ast}\sim\overline{t} 0.1$, where $\overline{t}$ is the geometric mean of the hoppings on the Cartesian axes.当对具有$ d $ - 米对称时，冷凝物具有$ d $ - 波角色。因此，$ t'u $和$ v'$的存在会导致无处不在的很小的对成对的成对，其逆质量是线性的，这可能会导致高温BEC。
We systematically examine how long-range hopping and its synergy with extended interactions leads to light bound pairs. Pair properties are determined for a dilute extended Hubbard model with large on-site repulsion ($U$) and both near- and next-nearest neighbour hopping ($t$ and $t'$) and attraction ($V$ and $V'$), for cubic and tetragonal lattices. The presence of $t'$ and $V'$ promotes light pairs. For tetragonal lattices, $t'<0$ pairs can be lighter than non-interacting particles, and $d$-symmetric pairs form. Close packing transition temperatures, $T^{\ast}$ are estimated for the Bose-Einstein condensation (BEC) of pairs to be $k_{B}T^{\ast}\sim\overline{t} 0.1$, where $\overline{t}$ is the geometric mean of the hoppings on the Cartesian axes. When pairs have $d$-symmetry, the condensate has $d$-wave character. Thus, the presence of both $t'$ and $V'$ leads ubiquitously to small strongly bound pairs with an inverse mass that is linear in hopping, which could lead to high temperature BECs.
