Non-Hermitian adiabatic transport in spaces of exceptional points

Non-Hermitian adiabatic transport in spaces of exceptional points
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特异点空间中的非厄米绝热输运

DOI:
10.1103/physreva.102.032216
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发表时间:
2020
期刊:
影响因子:
2.9
通讯作者:
Harris, J. G.
Harris, J. G.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Höller, J.;Read, N.;Harris, J. G.

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我们考虑等效于单个约旦块的非厄米哈密顿量(,3,…)的空间。我们关注的是在这个空间内沿着封闭路径(即环路)的绝热传输,在极限情况下,当时间尺度T=1/ /时,遍历环路趋于无穷大。我们证明了,对于某一类循环和初始状态的选择,状态返回到自身并获得一个复相,该复相等于乘以以1/n的幂次展开。因此,oforder项的指数(相当于“几何”或Berry相位模)与ε(如ε→0)无关;它只依赖于循环的同伦类,是的整数次幂。这些结果成立的条件之一是,对于环路上的所有点,传输的状态都是衰变最慢的状态。
We consider the space ofnon-Hermitian Hamiltonians (, 3, ...) that are equivalent to a singleJordan block. We focus on adiabatic transport around a closed path (i.e., a loop)withinthis space, in the limit as the time scale T=1/ɛ taken to traverse the loop tends to infinity. We show that, for a certain class of loops and a choice of initial state, the state returns to itself and acquires a complex phase that is ɛ−1 times an expansion in powers of ɛ1/n. The exponential of the term oforder (which is equivalent to the “geometric” or Berry phase modulo) is thus independent of ɛ as ɛ→0; it depends only on the homotopy class of the loop and is an integer power of. One of the conditions under which these results hold is that the state being transported is, for all points on the loop, that of slowest decay.
非厄米哈密顿量的几何相位因子(勘误表)
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发表时间: 1990
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