论文标题
$ t $ - $ t'$ - $ t''$ - $ j $型号的配对属性
Pairing Properties of the $t$-$t'$-$t''$-$J$ model
论文作者
论文摘要
我们研究了二维$ t $ - $ t'$ - $ t''$ - $ j $型号的配对属性，其中$ t'$和$ t''$是第二和第三个邻居跳，以兴奋剂级别的$ x \ x \0.1 $。最近对$ t $ - $ t'$ - $ j $型号的研究找到了与电子掺杂相关的$ t'> 0 $的强壮配对，但是与$ t'<0 $相关的配对与孔掺杂相关。这与丘比特形成鲜明对比的是，孔掺杂的过渡温度最高。 Cuprates的模型参数估计a $ t''$可与$ t'$相当，从原则上讲，这可能会解决此差异。但是，我们发现它没有。我们观察到对孔掺杂系统配对的抑制（$ t'<0，t''> 0 $），而电子掺杂系统（$ t'> 0，t'> 0，t''<0 $）$ d $ - 波配对是强大的。扩展的跳只是不足以使一频$ t $ - $ t'$ - $ j $型号能够描述孔掺杂系统中的配对。
We study the pairing properties of the two-dimensional $t$-$t'$-$t''$-$J$ model, where $t'$ and $t''$ are second and third neighbor hoppings, at a doping level $x\approx0.1$. Recent studies of the $t$-$t'$-$J$ model find strong pairing for $t'>0$, associated with electron doping, but an absence of pairing for $t'<0$ associated with hole doping. This is in contrast to the cuprates, where the highest transition temperatures appear for hole doping. Model parameterizations for the cuprates estimate a $t''$ comparable to $t'$, which, in principle, might fix this discrepancy. However, we find that it does not; we observe a suppression of pairing for the hole-doped system ($t'<0, t''>0$) while for the electron-doped system ($t'>0, t''<0$) $d$-wave pairing is robust. Extended hoppings appear to be insufficient to make the one-band $t$-$t'$-$J$ model capable of describing the pairing in the hole doped system.
