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Articles by Congwei Lu
Exceptional deficiency of non-Hermitian systems
Abstract Exceptional points are non-Hermitian singularities associated with the coalescence of individual eigenvectors accompanied by the degeneracy of their complex energies. Since their discovery, exceptional points have attracted much interest and enabled numerous advanced applications, including sensing. However, accessing exceptional points generally requires delicate parameter tuning, and any related phenomena are intrinsically restricted to a very narrow bandwidth.
Sudden death of entanglement with a Hamiltonian ensemble assisted by auxiliary qubits
Abstract In this paper, we theoretically propose a method to simulate the longitudinal relaxation of a single qubit by coupling it to an auxiliary qubit. In order to mimic the finite-temperature relaxation, we utilize the Hamiltonian-ensemble approach [C. M. Kropf, C. Gneiting, and A. Buchleitner, Phys. Rev. X 6, 031023 (2016)]. The longitudinal relaxation arises as a consequence of the ensemble average and the interaction between the working qubit and the auxiliary qubit.
Effects of disorder on Thouless pumping in higher-order topological insulators
Abstract We investigate the effects of random onsite disorder on higher-order Thouless pumping of noninteracting fermionic Benalcazar–Bernevig–Hughes (BBH) model. The interplay of disorder-induced topological phase transition and delocalization-localization transition is extensively explored.
Topological quantum transition driven by charge-phonon coupling in higher-order topological insulators
Abstract We investigate a second-order topological quantum transition of a modified Kane-Mele model driven by an electron-phonon interaction. The results show that the system parameters of the bare modified Kane-Mele model are renormalized by the electron-phonon interaction. Starting from the second-order topological phase for the bare model, the increasing electron-phonon coupling strength can drive the second-order topological insulator into a semimetal phase.
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