论文标题
超导体 - Quantum抗Fiferromagnet界面中的词素内间隙模式
Solitonic in-gap modes in a superconductor-quantum antiferromagnet interface
论文作者
论文摘要
超导体和其他材料之间界面处的界面是表征所涉及系统性质的强大工具，并为无法设计的量子激发而设计。常规S波超导体的缝隙激发例如，在具有净磁矩破坏时反转对称性的磁杂质处发生。在这里，我们表明超导体和量子抗fiferromagnet之间的界面可以托管强大的缝隙激发，而不会破坏时间反向对称性。我们在一维模型系统中说明了这种现象，在常规的S波超导体和标准哈伯德模型描述的一维莫特绝缘子之间具有接口。这种真正的多体问题可以通过使用内核多项式和张量网络技术来解决。我们通过证明它们可以绝热地连接到超导体和经典抗fiferromagnet之间的孤子溶液，从而揭示了这种零模式的性质。我们的结果提出了超导体和无序量子自旋相之间的一类新的差距激发，这与更广泛的异质结构有关。
Bound states at interfaces between superconductors and other materials are a powerful tool to characterize the nature of the involved systems, and to engineer elusive quantum excitations. In-gap excitations of conventional s-wave superconductors occur, for instance, at magnetic impurities with net magnetic moment breaking time-reversal symmetry. Here we show that interfaces between a superconductor and a quantum antiferromagnet can host robust in-gap excitations, without breaking time-reversal symmetry. We illustrate this phenomenon in a one-dimensional model system with an interface between a conventional s-wave superconductor and a one-dimensional Mott insulator described by a standard Hubbard model. This genuine many-body problem is solved exactly by employing a combination of kernel polynomial and tensor network techniques. We unveil the nature of such zero modes by showing that they can be adiabatically connected to solitonic solutions between a superconductor and a classical antiferromagnet. Our results put forward a new class of in-gap excitations between superconductors and a disordered quantum spin phase can be relevant for a wider range of heterostructures.
