With a motivation to understand the geometric phases for mixed states, we discuss finite temperature analysis of Hermitian and non-Hermitian topological models with extended range of couplings. To understand the geometric phases for the mixed states, we use Uhlmann phase and discuss the merit-...
It is noted that our model integrates non-Hermitian couplings, nonlinearity, and topological states, as illustrated in the bottom chart of Fig. 1a, offering a multi-degree-of-freedom platform to manipulate non-Hermitian topological synchronization....
Figure 1g also displays À 1 2 ghxyi, which has non-zero values, indicating the presence of non-Hermitian couplings between the x and y motions. Due to the axial symmetry, À 1 2 ghxyi = 0 under circular polarization (ζ = 45°), despite non-Hermitian coupling still being present....
Thus, for relatively small couplings the evolutions of the calculated values of σ z (t) and n (t) clearly show [29] a (quasi-)periodic exchange of energy between the atom and the field. Nevertheless, as g is increased, the restriction on the maximum SUB-N level that can be attained...
We study the scattering problem for the non-Hermitian scattering center, which consists of two Hermitian clusters with anti-Hermitian couplings between them. Counterintuitively, it is shown that it acts as a Hermitian scattering center, satisfying $|r| ^{2}+|t| ^{2}=1$, i.e., the Dirac...
Furthermore, we consider that there are resonances (couplings) between the s and t modes. The corresponding expressions are: Kst(as+at+at+as) and KDD(as+as+atat+at+at+asas) The former shows the 1:1 resonance while the latter the 2:2 resonance, which is also called the Darling—Dennis...
题目:Quantum Non-Hermitian Phenomena with Open Baths | 北京大学量子材料科学中心 时间:2024-04-17 15:00 报告人:胡颖 山西大学 主办方:北京大学量子材料科学中心 直播链接:蔻享学术 摘要:While enchanti…
Phase transitions connect different states of matter and are often concomitant with the spontaneous breaking of symmetries. An important category of phase transitions is mobility transitions, among which is the well known Anderson localization1, where in
Here, we attempt to explore the non-Hermitian Hopf bundle by visualizing the global linking structure of spinor strings in the momentum space of a two-dimensional electric circuit. By exploiting the flexibility of reconfigurable couplings between circuit nodes, we study the non-Hermitian topological ...
Non-Hermitian photonics and topological photonics, as new research fields in optics, have attracted much attention in recent years, accompanying by a great deal of new physical concepts and novel effects emerging. The two fields are gradually crossed during the development process and the non-Hermiti...