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Neudert, R.; Knupfer, M.; Golden, M. S.; Fink, J.; Stephan, W.; Penc, Karlo; Motoyama, N.; Eisaki, H.; Uchida, S.

doi:10.1103/physrevlett.81.657

Cited by 113 publications

(122 citation statements)

References 15 publications

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“…4,6 This feature was interpreted as an exciton in Ref. 4, expected from the strong coupling theory for the extended Hubbard model, but as a broad twoholon resonance in Ref. 6.…”

Section: Discussionmentioning

confidence: 99%

“…While the spin and η-spin symmetries account for an SO(4) = [SU (2) × SU (2)]/Z 2 symmetry, the global symmetry of the Hubbard model was recently found to be larger and given by [SO (4) …”

Section: A Modelmentioning

confidence: 99%

“…38,39 The results are also useful as an approximation to condensed matter systems where the integrability-breaking perturbations to the Hubbard model, such as the nearest neighbour interaction in the extended Hubbard model, are small. In this context the DSF has served to interpret electron energy loss spectroscopy 4 and inelastic x-ray experiments. 5,6 Since the Shiba transformation 40 maps the charge DSF for U > 0 to the spin DSF for U < 0, our results also apply to the spin DSF of the spin-gapped phase for the attractive Hubbard model.…”

Section: Introductionmentioning

confidence: 99%

“…One motivation for this is that questions about features of the excitation spectrum of 1D systems, such as the persistence of spin-charge separation at high energies, have become relevant with the improvement in the resolution of momentum-resolved experiments. [4][5][6][7][8] In addition, ultracold atoms trapped in optical lattices have emerged as a new means to study coherent dynamics of 1D models, including integrable ones which are not realizable in condensed matter systems. 9 At the same time, significant progress has been achieved in developing analytical [10][11][12][13][14][15][16][17][18][19][20][21][22] and numerical [23][24][25] techniques to study dynamical correlation functions in the high energy regime where conventional Luttinger liquid theory 26,27 does not apply.…”

Section: Introductionmentioning

confidence: 99%

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Charge dynamics in half-filled Hubbard chains with finite on-site interaction

et al. 2012

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We study the charge dynamic structure factor of the one-dimensional Hubbard model with finite on-site repulsion U at half filling. Numerical results from the time-dependent density matrix renormalization group are analyzed by comparison with the exact spectrum of the model. The evolution of the line shape as a function of U is explained in terms of a relative transfer of spectral weight between the two-holon continuum that dominates in the limit U → ∞ and a subset of the two-holontwo-spinon continuum that reconstructs the electron-hole continuum in the limit U → 0. Power-law singularities along boundary lines of the spectrum are described by effective impurity models that are explicitly invariant under spin and η-spin SU (2) rotations. The Mott-Hubbard metal-insulator transition is reflected in a discontinuous change of the exponents of edge singularities at U = 0. The sharp feature observed in the spectrum for momenta near the zone boundary is attributed to a Van Hove singularity that persists as a consequence of integrability.

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“…4,6 This feature was interpreted as an exciton in Ref. 4, expected from the strong coupling theory for the extended Hubbard model, but as a broad twoholon resonance in Ref. 6.…”

Section: Discussionmentioning

confidence: 99%

Section: A Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Charge dynamics in half-filled Hubbard chains with finite on-site interaction

et al. 2012

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“…Mapping the Zhang-Rice band onto the lower Hubbard band, the parameters in eq. (1) for Sr 2 CuO 3 have been estimated to be U/t = 10 and V /t = 1.5 ∼ 2.0 [4,21]. The parameters correspond to those used in Fig.…”

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confidence: 99%

Dynamical density matrix renormalization group study of photoexcited states in one-dimensional Mott insulators

2004

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One-dimensional Mott insulators exhibit giant nonlinear optical response. Based on the dynamical density matrix renormalization group method, photoexcited states and optical response in the insulators are studied as functions of the on-site and the nearest neighbor Coulomb interactions, U and V , respectively. We find that the lowest optically allowed and forbidden excited states across the Mott gap, which have odd and even parities, respectively, are degenerate for V /t < ∼ 2 with t being the hopping integral of an electron between nearest neighbor sites. For V /t > ∼ 2, the bound states with odd and even parities occur and are not degenerate. The nature of the degeneracy and its effect on the optical response are examined.PACS numbers: 71.10. Fd, 72.80.Sk, 78.30.Am In one-dimensional Mott insulators with strong onsite Coulomb interaction U , the ultrafast and gigantic nonlinear optical response have been observed [1,2]. The third-order nonlinear susceptibilities in the typical one-dimensional Mott insulators of charge transfer type, such as cuprates and halogen-bridged Ni-halides, are a thousand times larger than those of band insulators or Peierls insulators [2]. In the previous theoretical investigations [3,4], it has been pointed out that the anomalous enhancement of the nonlinear susceptibilities in the onedimensional Mott insulators originates in the large transition dipole moment between an optically allowed state with odd parity and an optically forbidden (two-photon allowed) state with even parity due to the degeneracy of these states.In the large-U limit, only the charge degree of freedom survives in the photoexcited states due to the spincharge separation [5], and the system is well described by an effective two particle model, called the holon-doublon model, which is composed of a holon representing one photoinduced empty site and a doublon representing one doubly occupied site with the attractive Coulomb interaction −V between them. When V exceeds a critical value V = 2t, these paricles form an excitonic bound state [6]. Since these two particles cannot exchange each other, the photoexcited states with odd and even parities are degenerate regardless of the magnitude of V . By using this model, the experimentally obtained optical spectra for the cuprates have been analyzed. However, the optical gap in the compounds is finite (∼ 2 eV) and thus the holon-doublon model, which is obtained in the limit of large U , may be re-examined. Under a finite-U condition, there is an intermediate process that these particles recombine, while this process is prohibited in the large-U limit. Since, in the finite-U condition, these particle can exchange their positions through the intermediate process, the eigenenergies of the odd-and even-parity states * Electronic address: matsueda@imr.tohoku.ac.jp may be different. Therefore, it is indispensable to clarify the optical response in Mott insulators with finite U .The minimal model to describe photoexcitation in the Mott insulators is the single-band extended Hubba...

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Imaging Beam‐Sensitive Materials by Electron Microscopy

et al. 2020

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Electron microscopy allows the extraction of multidimensional spatiotemporally correlated structural information of diverse materials down to atomic resolution, which is essential for figuring out their structureproperty relationships. Unfortunately, the high-energy electrons that carry this important information can cause damage by modulating the structures of the materials. This has become a significant problem concerning the recent boost in materials science applications of a wide range of beam-sensitive materials, including metal-organic frameworks, covalent-organic frameworks, organicinorganic hybrid materials, 2D materials, and zeolites. To this end, developing electron microscopy techniques that minimize the electron beam damage for the extraction of intrinsic structural information turns out to be a compelling but challenging need. This article provides a comprehensive review on the revolutionary strategies toward the electron microscopic imaging of beamsensitive materials and associated materials science discoveries, based on the principles of electron-matter interaction and mechanisms of electron beam damage. Finally, perspectives and future trends in this field are put forward. he worked as a postdoctoral fellow and research scientist at King Abdullah University of Science and Technology. His research interests now focus on low-dose electron microscopy and structural elucidation of beam-sensitive materials for applications such as catalysis, gas separation, and energy conversion/storage.

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Manifestation of Spin-Charge Separation in the Dynamic Dielectric Response of One-DimensionalSr2CuO3

Abstract: Manifestation of spin-charge separation in the dynamic dielectric response of onedimensional Sr2CuO3 Neudert, R.; Knupfer, M.; Golden, M.S.; Fink, J.; Stephan, W.; Penc, K.; Motoyama, N.; Eisaki, H.; Uchida, S.

Cited by 113 publications

References 15 publications

Charge dynamics in half-filled Hubbard chains with finite on-site interaction

Charge dynamics in half-filled Hubbard chains with finite on-site interaction

Dynamical density matrix renormalization group study of photoexcited states in one-dimensional Mott insulators

Imaging Beam‐Sensitive Materials by Electron Microscopy

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