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69 papers · 1 filter
Circuit analog of quadratic optomechanics
Eun-jong Kim, J. R. Johansson, Franco Nori
We propose a superconducting electrical circuit that simulates a quadratic optomechanical system. A capacitor placed between two transmission-line (TL) resonators acts like a semi-…
Fragment Model Study of Molecular Multi-Orbital System [Pd(dmit)]
Hitoshi Seo, Takao Tsumuraya, Masahisa Tsuchiizu +2
Electronic properties of quasi-two-dimensional molecular conductors [Pd(dmit)] are studied theoretically. We construct an effective model based on the fragment molecular…
Squeezed Optomechanics with Phase-matched Amplification and Dissipation
Xin-You Lü, Ying Wu, J. R. Johansson +3
We investigate the nonlinear interaction between a squeezed cavity mode and a mechanical mode in an optomechanical system (OMS) that allows us to selectively obtain either a radiat…
Structure of Lefschetz thimbles in simple fermionic systems
Takuya Kanazawa, Yuya Tanizaki
The Picard-Lefschetz theory offers a promising tool to solve the sign problem in QCD and other field theories with complex path-integral weight. In this paper the Lefschetz-thimble…
Density-matrix renormalization group study of third harmonic generation in one-dimensional Mott insulator coupled with phonon
Shigetoshi Sota, Seiji Yunoki, Takami Tohyama
We examine the third-order non-linear optical response of a one-dimensional Mott insulator coupled with phonons. The Mott insulator is described by an extended Hubbard-Holstein mod…
Iterative solutions to the steady state density matrix for optomechanical systems
P. D. Nation, J. R. Johansson, M. P. Blencowe +1
We present a sparse matrix permutation from graph theory that gives stable incomplete Lower-Upper (LU) preconditioners necessary for iterative solutions to the steady state density…