From the 3 of 64 papers with an AI index.
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4 papers · 1 filter
The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation
GergŠPintér, György Frank, Dániel Varjas +1
In quantum mechanics, the Schrieffer--Wolff (SW) transformation (also called quasi-degenerate perturbation theory) is known as an approximative method to reduce the dimension of th…
Multi-block exceptional points in open quantum systems
Aysel Shiralieva, Grigory A. Starkov, Björn Trauzettel
Open quantum systems can be approximately described by non-Hermitian Hamiltonians (NHHs) and Liouvillian superoperators. The two approaches differ by quantum jump terms correspondi…
Real critical exponents from the -expansion in an interacting model with non-Hermitian anisotropy
Eduard Naichuk, Jeroen van den Brink, Flavio S. Nogueira
In quantum optics and condensed matter physics non-Hermitian phenomena are often studied under the assumption of an open physical system. However, there are examples of intrinsical…
Asymptotic Exceptional Steady States in Dissipative Dynamics
Yu-Min Hu, Jan Carl Budich
Spectral degeneracies in Liouvillian generators of dissipative dynamics generically occur as exceptional points, where the corresponding non-Hermitian operator becomes non-diagonal…