Ultrabosonic behavior in photoexcited one-dimensional Mott insulators in the region of weak intersite Coulombic interaction
Ultrabosonic behavior in photoexcited one-dimensional Mott insulators in the region of weak intersite Coulombic interaction
复制标题
光激发一维莫特绝缘体在弱位点间库仑相互作用区域的超声波行为
DOI：
10.1103/physrevb.102.245114
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发表时间：
2021
影响因子：
3.7
通讯作者：
and H. Okamoto
中科院分区：
文献类型：
--
作者：
K. Iwano;T. Yamaguchi;and H. Okamoto
本文报道了一维Mott绝缘体中光激发的一种独特行为。当两个基元电荷激发之间的库仑吸引不起作用时，一个doublon和一个霍隆，最低的光激发被描述为它们的一个未结合的对，由于在同一位置上的禁止双重占据，仍然具有有限的相互关联。我们发现，在这种情况下，对服从的粒子统计，超过了普通玻色子。这一特点最直接地表现在对光生矩阵元素的增强因子中。我们讨论了可能的机制thissultrabosonicbehavior，也表明，这种行为是保持，即使我们包括少量的库仑相互作用。最后，这个增强因子几乎与普通玻色子一致，当格点间相互作用的程度超过一定值时，就会形成一个束缚的doublon-holon对。
This paper reports a unique behavior expected for the optical excitations in one-dimensional Mott insulators. When the intersite Coulombic attraction does not work between two elementary charge excitations, i.e., a doublon and a holon, the lowest optical excitations are described as an unbound pair of them, still having finite mutual correlation due to the forbidden double occupancy on the same site. We find that, in such a situation, the pairs obey a particle statistics that exceeds that of ordinary bosons. This feature appears most directly in the enhancement factor of the matrix element for the pair photocreation. We discuss the possible mechanism for thisultrabosonicbehavior and also demonstrate that this behavior is maintained even if we include a small amount of interiste Coulomibic interaction. Lastly, this enhancement factor almost coincides with that for ordinary bosons when the degree of the intersite interaction exceeds a certain value that switches on the formation of a bound doublon-holon pair.