Yongxu Fu

Quench dynamics in nonreciprocal Aubry-André-Harper model

Zhiyu Pei, Yongxu Fu, Gao Xianlong

The critical phase of a non-Hermitian quasicrystal can support stronger transport than its surrounding delocalized phase. We demonstrate this anomalous behavior in the one-dimensional nonreciprocal Aubry-André-Harper model through a combined study of dynamical quantum phase transitions (DQPTs) and wavepacket diffusion. Using a …

Cultural and social innovations in southwestern China during the Pleistocene-Holocene transition

Yongxu Fu, Yuqing Wang, Xinglong Zhang, Valentine Arnaud et autres

cn, fr, es (code pays fourni par la source)

Paleogenomics retraces the ancient population history of Southwestern East Asia for the past 12 000 years

Fan Bai, Xi Zhang, Yongxu Fu, Hongliang Lu et autres

ABSTRACT Southwestern East Asia, a key intersection linking southern East Asia, Southeast Asia, and the Tibetan Plateau, is a crucial area for the study of early human migrations. However, ancient DNA studies in the eastern part of the region, particularly in Guizhou, …

cn, bo, fr, lk, us (code pays fourni par la source)

$\mathbb{Z}_{2}$ Skin Channels and Effective Dynamical Quantum Phase Transitions

Yongxu Fu

We analytically describe the dynamically separated $\mathbb{Z}_{2}$ skin channels (wavepacket evolutions) under periodic boundary condition (PBC) in non-Hermitian systems with anomalous time-reversal symmetry (ATRS), by combining the semiclassical worldline perspective with an enhanced understanding of skin effects. These channels, tied to the …

$\mathbb{Z}_{2}$ Skin Channels and Effective Dynamical Quantum Phase Transitions

Yongxu Fu

We analytically describe the dynamically separated $\mathbb{Z}_{2}$ skin channels (wavepacket evolutions) under periodic boundary condition (PBC) in non-Hermitian systems with anomalous time-reversal symmetry (ATRS), by combining the semiclassical worldline perspective with an enhanced understanding of skin effects. These channels, tied to the …

Anatomy of non-Hermitian dynamical quantum phase transitions

Yongxu Fu, Gao Xianlong

We establish a unified framework for dynamical quantum phase transitions (DQPTs) in non-Hermitian systems that encompasses both biorthogonal and self-norm nonbiorthogonal formulations for pure and mixed states under quantum quench protocols. Our framework provides explicit expressions for the Loschmidt amplitude, Loschmidt echo, …

cn (code pays fourni par la source)

Characterizing Topological Phase Transition in Non-Hermitian Systems

ZhaoXiang Fang, Yongxu Fu, Guang-Can Guo, Long Xiong

We propose and present a concept of Topological Distance (TD), obtained from the integration of trace distance over the generalized Brillouin zone, in order to characterize the topological transitions of non-Hermitian systems. Specifically, such a quantity is used to measure the overall …

Non-Hermitian delocalization induced by residue imaginary velocity

Shi-Xin Hu, Yongxu Fu, Yi Zhang

The dichotomy of localization versus delocalization is a historic topic central to and widespread in quantum and condensed matter physics. Behind the complex scene, a few mechanisms are known to dominate the physics. Here, we show a delocalization mechanism attributed to a …

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Hermitian and Non-Hermitian Topological Transitions Characterized by Manifold Distance

ZhaoXiang Fang, Ming Gong, Guang-Can Guo, Yongxu Fu et autres

Topological phases are generally characterized by topological invariants denoted by integer numbers. However, different topological systems often require different topological invariants to measure, and theses definition usually fail at critical points. Therefore, it's challenging to predict what would occur during the transformation …

Braiding topology of non-Hermitian open-boundary bands

Yongxu Fu, Yi Zhang

There has been much recent interest and progress on topological structures of the non-Hermitian Bloch bands. Here, we study the topological structures of non-Bloch bands of non-Hermitian multiband quantum systems under open boundary conditions, which has received limited attention in prior studies. …

cn (code pays fourni par la source)

Braiding Topology of Non-Hermitian Open-Boundary Bands

Yongxu Fu, Yi Zhang

There has been much recent interest and progress on topological structures of the non-Hermitian Bloch bands. Here, we study the topological structures of non-Bloch bands of non-Hermitian multiband quantum systems under open boundary conditions, which has received limited attention in prior studies. …

Distance between two manifolds, topological phase transitions and scaling laws

ZhaoXiang Fang, Ming Gong, Guang-Can Guo, Yongxu Fu et autres

Topological phases are generally characterized by topological invariants denoted by integer numbers. However, different topological systems often require different topological invariants to measure, such as geometric phases, topological orders, winding numbers, etc. Moreover, geometric phases and its associated definitions usually fail at …