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Hidden-symmetry decoupling of Majorana bound states in topological superconductors

机译:拓扑超导体中Majorana束缚态的隐对称解耦

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Multiple zero-energy Majorana fermions (MFs) with spatially overlapping wave functions can survive only if their splitting is prevented by an underlying symmetry. Here we show that, in quasi-one-dimensional (Q1D) time-reversal-invariant topological superconductors (class DIII), a realistic model for superconducting lithium molybdenum purple bronze (Li_(0.9)Mo_6O_(17)) and certain families of organic superconductors, multiple Majorana-Kramers pairs with strongly overlapping wave functions persist at zero energy even in the absence of an easily identifiable symmetry. We find that similar results hold in the case of Q1D semiconductor-superconductor heterostructures (class D) with t_⊥ « t, where t_⊥ and t are the transverse and longitudinal hoppings, respectively. Our results, explained in terms of special properties of the Hamiltonian and wave functions, underscore the importance of hidden accidental symmetries in topological superconductors.
机译:具有空间重叠波函数的多个零能量马约拉那费米子(MF)仅在通过基本对称性阻止分裂的情况下才能生存。在这里,我们表明,在准一维(Q1D)时变不变拓扑超导体(DIII类)中,一个超导锂钼紫铜(Li_(0.9)Mo_6O_(17))和某些有机族的现实模型超导体,具有强烈重叠的波函数的多对Majorana-Kramers对,即使在没有易于识别的对称性的情况下也保持零能量。我们发现,在Q_D半导体-超导体异质结构(D类)的情况下,t_⊥«t,t_⊥和t分别是横向和纵向跳变,也得到了相似的结果。用汉密尔顿函数和波函数的特殊性质来解释我们的结果,强调了拓扑超导体中隐藏的意外对称性的重要性。

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