Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Starkov, Grigory A."'
Autor:
Starkov, Grigory A.
In this letter, we study how the spectrum of pseudo-Hermitian systems is influenced by the ambiguity in the choice of the pseudo-metric operator. In particular, we analyze the case when different parameter-independent choices of pseudo-metric are pos
Externí odkaz:
http://arxiv.org/abs/2402.07690
Publikováno v:
Phys. Rev. B 108, 235417 (2023)
Combining non-hermiticity and interactions yields novel effects in open quantum many-body systems. Here, we develop the generalized Schrieffer-Wolff transformation and derive the effective Hamiltonian suitable for various quasi-degenerate \textit{non
Externí odkaz:
http://arxiv.org/abs/2309.09829
Publikováno v:
Phys. Rev. A 108, 022206 (2023)
Motivated by the recent growing interest in the field of $\mathcal{P}\mathcal{T}$-symmetric Hamiltonian systems we theoretically study the emergency of singularities called Exceptional Points ($\textit{EP}$s) in the eigenspectrum of pseudo-Hermitian
Externí odkaz:
http://arxiv.org/abs/2302.14672
Publikováno v:
Annals of Physics, 169268 (2023)
We present a theoretical study of quantum phases and quantum phase transitions occurring in non-Hermitian $\mathcal{P}\mathcal{T}$-symmetric superconducting qubits chains described by a transverse-field Ising spin model. A non-Hermitian part of the H
Externí odkaz:
http://arxiv.org/abs/2211.00679
Instanton crystal is a fascinating phase which is encountered when the minimum of the free energy corresponds to a configuration with an imaginary-time-dependent order parameter in the form of a chain of alternating instantons and anti-instantons. We
Externí odkaz:
http://arxiv.org/abs/2111.02346
Publikováno v:
Phys. Rev. B 103, 075121 (2021)
We propose a class of models exhibiting instanton crystal phase. In this phase, the minimum of the free energy corresponds to a configuration with an imaginary-time-dependent order parameter in a form of a chain of alternating instantons and antiinst
Externí odkaz:
http://arxiv.org/abs/2011.12157
Publikováno v:
In Annals of Physics September 2023 456
Autor:
Starkov, Grigory A., Fine, Boris V.
Publikováno v:
Phys. Rev. B 101, 024428 (2020)
Nuclear spin-1/2 lattices where each spin has a small effective number of interacting neighbors represent a particular challenge for first-principles calculations of free induction decays (FIDs) observed by nuclear magnetic resonance (NMR). The chall
Externí odkaz:
http://arxiv.org/abs/1911.00990
Classical simulations of high-temperature nuclear spin dynamics in solids are known to accurately predict relaxation for spin 1/2 lattices with a large number of interacting neighbors. Once the number of interacting neighbors becomes four or smaller,
Externí odkaz:
http://arxiv.org/abs/1812.02155
Autor:
Starkov, Grigory A., Fine, Boris V.
Publikováno v:
Phys. Rev. B 98, 214421 (2018)
First-principles calculations of high-temperature spin dynamics in solids in the context of nuclear magnetic resonance (NMR) is a long-standing problem, whose conclusive solution can significantly advance the applications of NMR as a diagnostic tool
Externí odkaz:
http://arxiv.org/abs/1806.09355