Zobrazeno 1 - 10
of 90
pro vyhledávání: '"Maeshima, Nobuya"'
Autor:
Maeshima, Nobuya, Hino, Ken-ichi
We study low-lying spin-singlet excitations of two-leg Hubbard ladders with site-dependent potentials. Using general formulas of the charge disproportionation induced by the site-dependent potentials, we derive the contributions of spin degrees of fr
Externí odkaz:
http://arxiv.org/abs/2403.17412
Publikováno v:
Phys. Rev. B 108, 155308 (2023)
We investigate optically induced magnetization in Floquet-Weyl semimetals generated by irradiation of a circularly-polarized continuous-wave laser from the group II-V narrow gap semiconductor Zn$_3$As$_2$ in a theoretical manner. Here, this trivial a
Externí odkaz:
http://arxiv.org/abs/2306.15522
Floquet-Weyl semimetals (FWSMs) generated by irradiation of a continuous-wave laser with left-hand circular polarization (rotating in counterclockwise sense with time) on the group II-V narrow gap semiconductor Zn$_3$As$_2$ are theoretically investig
Externí odkaz:
http://arxiv.org/abs/2201.01578
Band crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles. Despite rapid progress in this field, the exploration of non-equilibri
Externí odkaz:
http://arxiv.org/abs/2008.06198
Autor:
Komaki, Yuhei, Iwase, Yuma, Yanagimatsu, Shogo, Muta, Yoshiyuki, Maeshima, Nobuya, Hino, Ken-ichi
Publikováno v:
J. Phys. Soc. Jpn. 88, 054709 (2019)
We present a numerical study of the charge dynamical structure factor N(k,omega) of a one-dimensional (1D) ionic Hubbard model in the Mott insulator phase. We show that the low-energy spectrum of N(k,omega) is expressed in terms of the spin operators
Externí odkaz:
http://arxiv.org/abs/1810.13106
Publikováno v:
Phys. Rev. B 99, 174304 (2019)
We investigate the spectral profiles of time signals attributed to coherent phonon generation in an undoped Si crystal. Here, the retarded longitudinal-optical (LO) phonon Green function relevant to the temporal variance of induced charge density of
Externí odkaz:
http://arxiv.org/abs/1808.08693
Publikováno v:
Phys. Rev. B 96, 125204 (2017)
Coherent phonon (CP) generation in an undoped Si crystal is theoretically investigated to shed light on unexplored quantum-mechanical effects in the early-time region immediately after the irradiation of ultrashort laser pulse. One examines time sign
Externí odkaz:
http://arxiv.org/abs/1705.07257
We examine a resonance structure of Floquet state in dynamic fractional Stark ladder (DFSL) realized in biased semiconductor superlattices driven by a terahertz cw laser on the basis of the R-matrix Floquet theory. To do this, we calculate an excess
Externí odkaz:
http://arxiv.org/abs/1511.08719
Publikováno v:
Phys. Rev. B 95, 014301 (2017)
We examine generation dynamics of coherent phonons (CPs) in both of polar and non-polar semiconductors -- such as GaAs and Si -- based on a polaronic-quasiparticle (PQ) model. In the model concerned, the PQ operator is composed of two kinds of operat
Externí odkaz:
http://arxiv.org/abs/1510.00263
Publikováno v:
J. Phys. Soc. Jpn. 80, 084710 (2011)
We theoretically study pump-photon-energy-dependent pathways of a photoinduced dimer-Mott-insulator-to-metal transition, on the basis of numerical solutions to the time-dependent Schr\"odinger equation for the exact many-body wave function of a two-d
Externí odkaz:
http://arxiv.org/abs/1106.2648