Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor*

Ai, Ping; Gao, Qiang; Liu, Jing; Zhang, Yuxiao; Liu, Cong; Huang, Jiangwei; Song, Chunyao; Yan, Hongtao; Zhao, Lin; Liu, Guodong; Gu, Genda; Zhang, Fengfeng; Yang, Feng; Peng, Qinjun; Zu, Zuyan; Zhou, Xianghui

doi:10.1088/0256-307x/36/6/067402

Cited by 21 publications

(9 citation statements)

References 57 publications

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“…indicates that it is a Bi2212 specific phenomenon. Compared with Bi2201, the unique features of Bi2212 lie in the presence of two CuO 2 planes in one structural unit that gives rise to bilayer splitting [41][42][43][44][45][46][47][48][49]. Although there is only one main Fermi surface that is observed during our measurements, there are actually two Fermi surface sheets, bonding and antibonding, that are present.…”

Section: The Observation Of the Unusual Band Hybridization In Bi2212 ...mentioning

confidence: 99%

“…Another feature of Bi2212 is that there are two CuO 2 planes in one structural unit separated by calcium (Ca). The interaction between these two structurally equivalent CuO 2 planes gives rise to bilayer splitting, i.e., two Fermi surface sheets, bonding and antibonding, which correspond to different doping levels with distinct superconducting gap [41][42][43][44][45][46][47][48][49]. While most ARPES measurements focus on the main band, little attention has been paid on the interaction between the main and superstructure bands, and between the bonding and antibonding bands.…”

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Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

et al. 2020

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High-resolution laser-based angle-resolved photoemission measurements have been carried out on Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) and Bi 2 Sr 2−x La x CuO 6+δ (Bi2201) superconductors. Unexpected hybridization between the main band and the superstructure band in Bi2212 is clearly revealed. In the momentum space where one main Fermi surface intersects with one superstructure Fermi surface, four bands are observed instead of two. The hybridization exists in both superconducting state and normal state, and in Bi2212 samples with different doping levels. Such a hybridization is not observed in Bi2201. This phenomenon can be understood by considering the bilayer splitting in Bi2212, the selective hybridization of two bands with peculiar combinations, and the altered matrix element effects of the hybridized bands. These observations provide strong evidence on the origin of the superstructure band which is intrinsic to the CuO 2 planes. Therefore, understanding physical properties and superconductivity mechanism in Bi2212 should consider the complete Fermi surface topology which involves the main bands, the superstructure bands and their interactions.

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Section: The Observation Of the Unusual Band Hybridization In Bi2212 ...mentioning

confidence: 99%

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confidence: 99%

Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

et al. 2020

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“…Recent generation laser-based ARPES and VUV synchrotron-based ARPES (Berntsen et al, 2011;Harter et al, 2012;He et al, 2016c;Kiss et al, 2005;Liu et al, 2008) have mapped the k-dependent superconducting gap ∆(k) in the vicinity of the node (Fig. 19, 20) (Ai et al, 2019;Kondo et al, 2015a;Sakamoto et al, 2017Sakamoto et al, , 2016Vishik et al, 2012Vishik et al, , 2010. The measured ∆(k) can be fitted to the d-wave momentum form ∆(k) = 0.5 × v ∆ |cos k x − cos k y |, where v ∆ is the gap velocity (dashed line in Fig.…”

Section: Momentum Dependencementioning

confidence: 99%

Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy

Sobota,

He,

Shen

2020

Preprint

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The physics of quantum materials is dictated by many-body interactions and mathematical concepts such as symmetry and topology that have transformed our understanding of matter. Angle-resolved photoemission spectroscopy (ARPES), which directly probes the electronic structure in momentum space, has played a central role in the discovery, characterization, and understanding of quantum materials ranging from strongly-correlated states of matter to those exhibiting non-trivial topology. Over the past two decades, ARPES as a technique has matured dramatically with ever-improving resolution and continued expansion into the space-, time-, and spin-domains. Simultaneously, the capability to synthesize new materials and apply non-thermal tuning parameters in-situ has unlocked new dimensions in the study of all quantum materials. We review these developments, and survey the scientific contributions they have enabled in contemporary quantum materials research. IV. Copper-based superconductorsA. Overview B. Normal state 1. Doping evolution of the electronic structure

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“…In this context, the prediction of the electronic properties of such strongly correlated electron systems using band theory is far more challenging, in contrast to the case of conventional semiconductors, which can be well described by one-electron theories. However, angle-resolved photoemission spectroscopy (ARPES) has been proven to be a reliable tool to experimentally probe the fine electronic properties of these correlated materials [6][7][8] . Specifically, this technique can provide straightforward information on the momentum-resolved low-energy electronic structure of matter in the vicinity of the Fermi level, which is vital to detecting various properties of solids.…”

Section: Introductionmentioning

confidence: 99%

High-resolution ARPES endstation for in situ electronic structure investigations at SSRF

Yang

Liu

et al. 2021

NUCL SCI TECH

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Angle-resolved photoemission spectroscopy (ARPES) is one of the most powerful experimental techniques in condensed matter physics. Synchrotron ARPES, which uses photons with high flux and continuously tunable energy, has become particularly important. However, an excellent synchrotron ARPES system must have features such as a small beam spot, super-high energy resolution, and a user-friendly operation interface. A synchrotron beamline and an endstation (BL03U) were designed and constructed at the Shanghai Synchrotron Radiation Facility. The beam spot size at the sample position is 7.5 (V) lm 9 67 (H) lm, and the fundamental photon range is 7-165 eV; the ARPES system enables photoemission with an energy resolution of 2.67 meV at 21.2 eV. In addition, the ARPES system of this endstation is equipped with a six-axis cryogenic sample manipulator (the lowest temperature is 7 K) and is integrated with an oxide molecular beam epitaxy system and a scanning tunneling microscope, which can provide an advanced platform for in situ characterization of the fine electronic structure of condensed matter.

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Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi₂Sr₂CaCu₂O_8+δ Superconductor*

Cited by 21 publications

References 57 publications

Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

Selective hybridization between the main band and the superstructure band in the Bi2Sr2CaCu2O8+δ superconductor

Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy

High-resolution ARPES endstation for in situ electronic structure investigations at SSRF

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