分子中的非厄米拓扑：分数量子数的预测
Non-Hermitian topology in molecules: Prediction of fractional quantum number
摘要：
我们给出了一个简单的玩具模型来研究一个著名的Jahn-Teller型分子。由于非绝热耦合和有限温度效应的有限寿命导致有效哈密顿量是非厄米的。这种效应将一个圆锥相交点拉成一对相连的外尔点，由费米弧桥接。费米弧的长度取决于非厄米性的强度。这是一个独特的功能，非埃尔米特拓扑没有埃尔米特类似。我们预言了分子中存在Weyl点，这些Weyl点导致了反常的Jahn-Teller效应和分数量子数。
英文摘要：
We give a simple toy model to study a famous Jahn-Teller type molecule. Finite lifetime due to non-adiabatic coupling and finite temperature effect results in the effective Hamiltonian to be non-Hermitian. This effect pulls a conical intersection into a pair of connected Weyl points, bridged by a Fermi arc. The length of the Fermi arc depends on the strength of non-hermicity. This is a unique feature of non-Hermitian topology with no Hermitian analogue. We predict the existence of Weyl points in molecules which cause anomalous Jahn-Teller effects and fractional quantum number.
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