Slowly decaying zero mode in a weakly nonintegrable boundary impurity model

Slowly decaying zero mode in a weakly nonintegrable boundary impurity model
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弱不可积边界杂质模型中缓慢衰减的零模式

DOI:
10.1103/physrevb.108.165143
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发表时间:
2023
期刊:
影响因子:
3.7
通讯作者:
Mitra, Aditi
Mitra, Aditi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yeh, Hsiu-Chung;Cardoso, Gabriel;Korneev, Leonid;Sels, Dries;Abanov, Alexander G.;Mitra, Aditi

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半无限链上的横向场Ising模型(TFIM)具有边零模式。这项工作考虑了一个杂质模型:TFIM受边界可积性破坏相互作用的扰动。对于足够大的横场,但在TFIM的有序相位,观察到零模式衰减。这种衰减在性质上不同于零模式,在零模式中,可积破缺相互作用沿链都是非零的。结果表明,对于杂质模型,零模式通过弛豫到非局部准守恒算子而衰减,当链的对边没有非交换扰动时,后者是精确守恒的,从而保证了谱的完全简并。在热力学极限下,准守恒算子消失,零模式的衰变遵循费米黄金法则。在克雷洛夫空间中构造了一个衰变的玩具模型,并强调了如何从这个玩具模型中恢复费米的黄金法则。
The transverse field Ising model (TFIM) on the half-infinite chain possesses an edge zero mode. This work considers an impurity model: TFIM perturbed by a boundary integrability-breaking interaction. For sufficiently large transverse field, but in the ordered phase of the TFIM, the zero mode is observed to decay. The decay is qualitatively different from zero modes where the integrability-breaking interactions are nonzero all along the chain. It is shown that for the impurity model, the zero mode decays by relaxing to a nonlocal quasiconserved operator, the latter being exactly conserved when the opposite edge of the chain has no noncommuting perturbations so as to ensure perfect degeneracy of the spectrum. In the thermodynamic limit, the quasiconserved operator vanishes, and a regime is identified where the decay of the zero mode obeys Fermi's golden rule. A toy model for the decay is constructed in Krylov space and it is highlighted how Fermi's golden rule may be recovered from this toy model.
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