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Huang HX, Chen J, Ren W, Gao Y, Li W, Chen Y. Insulator-metal transition and quasi-flat-band of Shastry-Sutherland lattice. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:345402. [PMID: 31096201 DOI: 10.1088/1361-648x/ab2228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Insulator-metal transition is investigated self-consistently on the frustrated Shastry-Sutherland lattice in the framework of Slave-Boson mean-field theory. Due to the presence of quasi-flat band structure characteristic, the system displays a spin-density-wave (SDW) insulating phase at the weak doping levels, which is robust against frustration, and it will be transited into an SDW metallic phase at high doping levels. As further increasing the doping, the temperature or the frustration on the diagonal linking bonds, the magnetic order m will be monotonically suppressed, resulting in the appearance of a paramagnetic metallic phase. Although the Fermi surface of the SDW metallic phase may be immersed by temperature, the number of mobile charges is robust against temperature at weak doping levels.
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Affiliation(s)
- Huai-Xiang Huang
- Department of Physics and Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
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Voo KK. Order and excitation in partially Gutzwiller projected t-t'-t"-J-U models. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:495602. [PMID: 22101308 DOI: 10.1088/0953-8984/23/49/495602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Extended t-t'-t"-J-U models in which the second-nearest-neighbor hopping (t') and third-nearest-neighbor hopping (t") are included are studied using renormalized mean field theory. The models are meant to be low-energy effective models for the Hubbard models, and hence the Heisenberg exchange integral J and Hubbard repulsion U are related by J = 4t(2)/U. The trial wavefunctions for the ground states are partially Gutzwiller projected Hartree-Fock states. The Gutzwiller projection is implemented by means of a Gutzwiller approximation, and the site double occupancy d is taken as a variational parameter. It is found that a large |t'/t| narrows the band filling range that sustains antiferromagnetism (AFM) in the ground state, enhances the d-wave singlet superconductivity (dSC) in hole overdoped systems, but suppresses the dSC in electron overdoped systems. For a system that has large |t'/t| and |t"/t'|, the superconductivity (SC) at the onset of AFM in hole doped band filling is strongly suppressed. On the excitation occurring, when an electron doped system simultaneously contains SC and AFM, the system is found to have a nodeless gap at the Fermi level. Finally, the result of this study is related to experiments on the superconducting cuprates.
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Affiliation(s)
- Khee-Kyun Voo
- Department of Communication Engineering, Oriental Institute of Technology, Banqiao Area, New Taipei City 22061, Taiwan.
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Zhou T. Theoretical investigation of the four-layered self-doped high-Tc superconductors: evidence of the pair tunneling effect. PHYSICAL REVIEW LETTERS 2011; 106:167001. [PMID: 21599401 DOI: 10.1103/physrevlett.106.167001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Indexed: 05/30/2023]
Abstract
Based on a four-layered self-doped t-J type model and the slave-boson mean-field approach, we study theoretically the superconductivity in the electron-doped and hole-doped layers. The neighbor layers are coupled through both the single electron interlayer hopping and pair tunneling effect. The superconducting gap magnitude for the electron-doped band is nearly twice that of the hole-doped one, which contrasts with our previous understanding of the electron-hole asymmetry in high-T(c) superconductors but is consistent with recent angle-resolved photoemission spectroscopy experiments in four-layered materials Ba2Ca3Cu4O8F2. Our results propose that the pair tunneling effect is important to examine the multilayered superconducting materials.
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Affiliation(s)
- Tao Zhou
- College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, China
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Mishchenko AS. Electron - phonon coupling in underdoped high-temperature superconductors. ACTA ACUST UNITED AC 2009. [DOI: 10.3367/ufnr.0179.200912b.1259] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Yin WG, Ku W. A novel first-principles approach to effective Hamiltonians for high Tcsuperconducting cuprates. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/108/1/012032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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6
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Macridin A, Jarrell M, Maier T, Kent PRC, D'Azevedo E. Pseudogap and antiferromagnetic correlations in the hubbard model. PHYSICAL REVIEW LETTERS 2006; 97:036401. [PMID: 16907520 DOI: 10.1103/physrevlett.97.036401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2005] [Indexed: 05/11/2023]
Abstract
Using the dynamical cluster approximation and quantum Monte Carlo simulations we calculate the single-particle spectra of the Hubbard model with next-nearest neighbor hopping . In the underdoped region, we find that the pseudogap along the zone diagonal in the electron doped systems is due to long-range antiferromagnetic correlations. The physics in the proximity of (0, pi) is dramatically influenced by t' and determined by the short range correlations. The effect t' of on the low-energy angle-resolved photoemission spectroscopy spectra is weak except close to the zone edge. The short range correlations are sufficient to yield a pseudogap signal in the magnetic susceptibility and produce a concomitant gap in the single-particle spectra near (pi, pi/2), but not necessarily at a location in the proximity of the Fermi surface.
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Civelli M, Capone M, Kancharla SS, Parcollet O, Kotliar G. Dynamical breakup of the fermi surface in a doped Mott insulator. PHYSICAL REVIEW LETTERS 2005; 95:106402. [PMID: 16196948 DOI: 10.1103/physrevlett.95.106402] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2004] [Revised: 05/12/2005] [Indexed: 05/04/2023]
Abstract
The evolution from an anomalous metallic phase to a Mott insulator within the two-dimensional Hubbard model is investigated by means of the cellular dynamical mean-field theory. We show that approaching the density-driven Mott metal-insulator transition the Fermi surface is strongly renormalized and the quasiparticle description breaks down in a very anisotropic fashion. Regions where the quasiparticles are strongly scattered (hot spots) and regions where the scattering rate is relatively weak (cold spot) form irrespective of whether the parent insulator has antiferromagnetic long-range order, while their location is not universal and is determined by the interplay of the renormalization of the scattering rate and the Fermi surface shape.
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Affiliation(s)
- M Civelli
- Physics Department and Center for Materials Theory, Rutgers University, Piscataway, New Jersey USA
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Ribeiro TC, Wen XG. New mean-field theory of the tt't''J model applied to high-T(c) superconductors. PHYSICAL REVIEW LETTERS 2005; 95:057001. [PMID: 16090908 DOI: 10.1103/physrevlett.95.057001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2004] [Indexed: 05/03/2023]
Abstract
We introduce a new mean-field approach to the tt't''J model that incorporates both electron-like quasiparticle and spinon excitations as suggested by some experiments and numerical studies. It leads to a mean-field phase diagram which is consistent with that of hole and electron doped cuprates. Moreover, it provides a framework to describe the observed evolution of the electron spectral function from the undoped insulator to the overdoped Fermi metal for both hole and electron doping. The theory also provides a new non-BCS mechanism leading to superconductivity.
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Affiliation(s)
- Tiago C Ribeiro
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Tsutsui K, Tohyama T, Maekawa S. Mott gap excitations and resonant inelastic x-ray scattering in doped cuprates. PHYSICAL REVIEW LETTERS 2003; 91:117001. [PMID: 14525453 DOI: 10.1103/physrevlett.91.117001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2003] [Indexed: 05/24/2023]
Abstract
Predictions are made for the momentum- and carrier-dependent degradation of the Mott gap upon doping in high-T(c) cuprates as would be observed in Cu K-edge resonant inelastic x-ray scattering (RIXS). The two-dimensional Hubbard model with second- and third-nearest-neighbor hopping terms has been studied by numerical exact diagonalization. Special emphasis is placed on the particle-hole asymmetry of the Mott gap excitations. We argue that the Mott gap excitations observed by RIXS are significantly influenced by the interaction between charge carriers and antiferromagnetic correlations.
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Affiliation(s)
- Kenji Tsutsui
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Lee WC, Lee TK, Ho CM, Leung PW. Low-energy spectra in t-J-type models at low doping levels. PHYSICAL REVIEW LETTERS 2003; 91:057001. [PMID: 12906623 DOI: 10.1103/physrevlett.91.057001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2003] [Indexed: 05/24/2023]
Abstract
Based on a variational approach, we propose that there are two kinds of low-energy states in the t-J-type models at low doping. In a quasiparticle state an unpaired spin bound to a hole with a well-defined momentum can be excited with spin waves. The resulting state shows a suppression of antiferromagnetic order around the hole with the profile of a spin bag. These spin-bag states with spin and charge or hole separated form a continuum of low-energy excitations. Very different properties predicted by these two kinds of states explain a number of anomalous results observed in the exact diagonalization studies on small clusters up to 32 sites.
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Affiliation(s)
- Wei-Cheng Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan 11529
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Lee TK, Ho CM, Nagaosa N. Theory for slightly doped antiferromagnetic mott insulators. PHYSICAL REVIEW LETTERS 2003; 90:067001. [PMID: 12633317 DOI: 10.1103/physrevlett.90.067001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2002] [Indexed: 05/24/2023]
Abstract
New trial wave functions, constructed explicitly from the unique Mott insulating state with antiferromagnetic order, are proposed to describe the ground state of a Mott insulator slightly doped with holes or electrons. A rigid band is observed as charged quasiparticles with well-defined momenta being realized in these states. These states have much less superconducting correlations than previously studied ones. Small Fermi patches obtained are consistent with recent experiments on high T(c) cuprates doped lightly with holes or electrons.
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Affiliation(s)
- T K Lee
- Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan 11529
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Xiang T, Wheatley JM. Quasiparticle energy dispersion in doped two-dimensional quantum antiferromagnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R12653-R12656. [PMID: 9985211 DOI: 10.1103/physrevb.54.r12653] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kyung B, Ferrell RA. Quasiparticle dispersion of the insulating copper oxide Sr2CuO2Cl2 by employing vertical and horizontal double hoppings. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10125-10130. [PMID: 9984752 DOI: 10.1103/physrevb.54.10125] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bala J, Oles AM, Zaanen J. Quasiparticles in the spin-fermion model for CuO2 planes. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10161-10174. [PMID: 9984757 DOI: 10.1103/physrevb.54.10161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Bala J, Oles AM. Quasiparticle band in the frustrated t-t'-J model. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:3495-3498. [PMID: 9986251 DOI: 10.1103/physrevb.54.3495] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Feiner LF, Jefferson JH, Raimondi R. Intrasublattice Hopping in the Extended t-J Model and Tmaxc in the Cuprates. PHYSICAL REVIEW LETTERS 1996; 76:4939-4942. [PMID: 10061418 DOI: 10.1103/physrevlett.76.4939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Raimondi R, Jefferson JH, Feiner LF. Effective single-band models for the high-Tc cuprates. II. Role of apical oxygen. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:8774-8788. [PMID: 9982390 DOI: 10.1103/physrevb.53.8774] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Feiner LF, Jefferson JH, Raimondi R. Effective single-band models for the high-Tc cuprates. I. Coulomb interactions. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:8751-8773. [PMID: 9982389 DOI: 10.1103/physrevb.53.8751] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Belinicher VI, Chernyshev AL, Shubin VA. Generalized t-t'-J model: Parameters and single-particle spectrum for electrons and holes in copper oxides. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:335-342. [PMID: 9981982 DOI: 10.1103/physrevb.53.335] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kampf AP. Collective excitations in itinerant spiral magnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:747-757. [PMID: 9983029 DOI: 10.1103/physrevb.53.747] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Duffy D, Moreo A. Influence of next-nearest-neighbor electron hopping on the static and dynamical properties of the two-dimensional Hubbard model. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:15607-15616. [PMID: 9980922 DOI: 10.1103/physrevb.52.15607] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Batista CD, Lema F, Aligia AA. Superconductivity from correlated hopping. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:6223-6226. [PMID: 9981849 DOI: 10.1103/physrevb.52.6223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Simón ME, Aligia AA. Derivation and numerical study of the singlet-triplet model for cuprate superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:7701-7707. [PMID: 9979715 DOI: 10.1103/physrevb.52.7701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bala J, Oles AM, Zaanen J. Spin polarons in the t-t'-J model. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:4597-4606. [PMID: 9981597 DOI: 10.1103/physrevb.52.4597] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Haas S. Doping dependence of the Fermi surface in the t-J model. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:11748-11752. [PMID: 9977914 DOI: 10.1103/physrevb.51.11748] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nazarenko A, Vos KJ, Haas S, Dagotto E, Gooding RJ. Photoemission spectra of Sr2CuO2Cl2: A theoretical analysis. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8676-8679. [PMID: 9977499 DOI: 10.1103/physrevb.51.8676] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Schiller A, Kumar P, Strack R, Vollhardt D. Effects of next-nearest-neighbor hopping on the hole motion in an antiferromagnetic background. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8337-8346. [PMID: 9977443 DOI: 10.1103/physrevb.51.8337] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Deeg M, Fehske H. Slave-boson study of the t-t'-J model: Phase diagram, spin susceptibility, and Hall resistivity. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:17874-17880. [PMID: 9976220 DOI: 10.1103/physrevb.50.17874] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Gooding RJ, Vos KJ, Leung PW. Theory of electron-hole asymmetry in doped CuO2 planes. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:12866-12875. [PMID: 9975455 DOI: 10.1103/physrevb.50.12866] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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