Hole photoproduction in insulating copper oxide

Sushkov, O. P.; Sawatzky, G. A.; Eder, R.; Eskes, Henk

doi:10.1103/physrevb.56.11769

Cited by 72 publications

(122 citation statements)

References 28 publications

(36 reference statements)

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“…5c); the exciton QP displays a steep drop in intensity as (p/2,p/2) is crossed. This is a generic feature predicted for a hole in a t-J model within an SCBA approach 41 and indirectly inferred from ARPES measurements on cuprates 42 . Although some deviations from the cuprate physics might have been expected on general grounds due to fundamentally different nature of a hole and an exciton, and material-specific differences between Sr 2 IrO 4 and cuprates, the striking agreement down to a level of fine details with theories constructed for hole dynamics in cuprates demonstrates excellent parallel between the low-energy physics of Sr 2 IrO 4 and the cuprates.…”

Section: Article Nature Communications | Doi: 101038/ncomms5453mentioning

confidence: 99%

Excitonic quasiparticles in a spin–orbit Mott insulator

et al. 2014

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In condensed matter systems, out of a large number of interacting degrees of freedom emerge weakly coupled quasiparticles (QPs), in terms of which most physical properties are described. The lack of identification of such QPs is a major barrier for understanding myriad exotic properties of correlated electrons, such as unconventional superconductivity and non-Fermi liquid behaviours. Here we report the observation of a composite particle in a quasi-two-dimensional spin-1/2 antiferromagnet Sr 2 IrO 4 -an exciton dressed with magnons-that propagates with the canonical characteristics of a QP: a finite QP residue and a lifetime longer than the hopping time scale. The dynamics of this charge-neutral excitation mirrors the fundamental process of the analogous one-hole propagation in the background of spins-1/2, and reveals the same intrinsic dynamics that is obscured for a single, charged-hole doped into two-dimensional cuprates.

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Section: Article Nature Communications | Doi: 101038/ncomms5453mentioning

confidence: 99%

Excitonic quasiparticles in a spin–orbit Mott insulator

et al. 2014

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“…Refs. [7,8,9]), but basically it is the t − J model. Superconducting pairing in the t − J model induced by spin-wave exchange has been considered in the papers [10,11].…”

Section: Introductionmentioning

confidence: 99%

The role of g-wave pairing and Josephson tunneling in high-Tc cuprate superconductors

Shevchenko¹,

Sushkov²

1998

Physica C: Superconductivity

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The implications of the two-pocket Fermi surface for macroscopic quantum phenomena are considered. We demonstrate that in the case of the two-pocket Fermi surface the g-wave pairing is closely related to the d-wave one. As a result two macroscopic condensates arise. The Josephson tunneling for such twocomponent system has very special properties. We prove that the presence of the g-wave does not contradict the existing experimental data on tunneling. We also discuss the possible ways to experimentally reveal the g-wave component.

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“…However, there is no sign of such electron pockets in our ARPES data from underdoped YBCOK2, nor are there signs of extra zonefolding due to the kinds of density wave instabilities that might give rise to such a Fermi surface reconstruction 8,9,15 . If any pocket had to be postulated on the basis of the present ARPES data, the most obvious possibility would be that the Fermi arcs are in fact hole-like nodal Fermi pockets, as obtained for light doping of the antiferromagnetic parent compound in selfconsistent Born calculations 26 and already speculated from the study of other underdoped cuprates [4][5][6] . The lack of a finite ARPES intensity on the outer side of the pockets would be consistent with the strong drop in the quasiparticle coherence Z k expected beyond the antiferromagnetic zone boundary 13,27 .…”

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confidence: 99%

In situ doping control of the surface of high-temperature superconductors

et al. 2008

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Central to the understanding of high-temperature superconductivity is the evolution of the electronic structure as doping alters the density of charge carriers in the CuO 2 planes. Superconductivity emerges along the path from a normal metal on the overdoped side to an antiferromagnetic insulator on the underdoped side. This path also exhibits a severe disruption of the overdoped normal metal's Fermi surface 1-3 . Angle-resolved photoemission spectroscopy (ARPES) on the surfaces of easily cleaved materials such as Bi 2 Sr 2 CaCu 2 O 8+δ shows that in zero magnetic field the Fermi surface breaks up into disconnected arcs 4-6 . However, in high magnetic field, quantum oscillations 7 at low temperatures in YBa 2 Cu 3 O 6.5 indicate the existence of small Fermi surface pockets [8][9][10][11][12][13][14][15][16][17][18] . Reconciling these two phenomena through ARPES studies of YBa 2 Cu 3 O 7−δ (YBCO) has been hampered by the surface sensitivity of the technique [19][20][21] . Here, we show that this difficulty stems from the polarity and resulting self-doping of the YBCO surface. Through in situ deposition of potassium atoms on cleaved YBCO, we can continuously control the surface doping and follow the evolution of the Fermi surface from the overdoped to the underdoped regime. The present approach opens the door to systematic studies of hightemperature superconductors, such as creating new electrondoped superconductors from insulating parent compounds.In the heavily overdoped regime, angular magnetoresistance oscillation 1 and angle-resolved photoemission spectroscopy (ARPES) experiments 2,3 on Tl 2 Ba 2 CuO 6+δ have arrived at a quantitative consensus in observing a large hole-like Fermi surface. On reducing the number of holes in the CuO 2 planes, the Fermi surface volume decreases in the manner expected by Luttinger's theorem, but below optimal doping the single-particle Fermi surface seems to reduce to four disconnected nodal Fermi arcs. This scenario was suggested from ARPES studies of Bi cuprates 4,5 and Ca 2−x Na x CuO 2 Cl 2 (ref. 6), and is thought to be connected to the existence of the pseudogap. The detection of quantum oscillations in oxygen-ordered ortho-II YBa 2 Cu 3 O 6.5 (YBCO6.5) suggests a different scenario involving Fermi surface reconstruction into hole and/or electron pockets 7,9,10 . These two pictures are derived from quite different measurement techniques, carried out on different materials, and under conditions of high magnetic field in one case, but zero field in the other. Owing to the complex multiband and correlated character of the electronic structure of YBCO6.5 (ref. 11), the determination of the nature of these pockets and their generality to the underdoped cuprates requires connecting transport and single-particle spectroscopy information on the same underdoped system. The study of YBCO6.5 by ARPES is thus crucial. Unfortunately, this material is complicated by the lack of a natural [001] cleavage plane (Fig. 1a)

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Hole photoproduction in insulating copper oxide

Abstract: Basing on t-J model we calculate the k-dependence of a single hole photoproduction probability for CuO2 plane at zero doping. We also discuss the radiation of spin-waves which can substantially deform the shape of photoemission spectra.Comment: latex 8 pages, 3 figure

Cited by 72 publications

References 28 publications

Excitonic quasiparticles in a spin–orbit Mott insulator

Excitonic quasiparticles in a spin–orbit Mott insulator

The role of g-wave pairing and Josephson tunneling in high-Tc cuprate superconductors

In situ doping control of the surface of high-temperature superconductors

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