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Sui, XH; Wang, HT; Tang, H; Su, ZB; Wang, HT (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
Quasiparticle density of states by inversion with maximum entropy method
Source PublicationPHYSICAL REVIEW B
Language英语
AbstractWe propose to extract the quasiparticle density of states (DOS) of the superconductor directly from the experimentally measured superconductor-insulator-superconductor junction tunneling data by applying the maximum entropy method to the nonlinear systems. It merits the advantage of model independence with minimum a priori assumptions. Various components of the proposed method have been carefully investigated, including the meaning of the targeting function, the mock function, as well as the role and the designation of the input parameters. The validity of the developed scheme is shown by two kinds of tests for systems with known DOS. As a preliminary application to a Bi2Sr2CaCu2O8+delta sample with its critical temperature T-c = 89 K, we extract the DOS from the measured intrinsic Josephson junction current data at temperatures of T = 4.2 K, 45 K, 55 K, 95 K, and 130 K. The energy gap decreases with increasing temperature below T-c, while above T-c, a kind of energy gap survives, which provides an angle to investigate the pseudogap phenomenon in high-T-c superconductors. The developed method itself might be a useful tool for future applications in various fields.
2016
Volume94Issue:14Pages:144505
Subject AreaPhysics
DOIhttp://dx.doi.org/10.1103/PhysRevB.94.144505
Indexed BySCI
Funding OrganizationNatural Science Foundation of China [11121403, 11434015] ; Natural Science Foundation of China [11121403, 11434015] ; Natural Science Foundation of China [11121403, 11434015] ; Natural Science Foundation of China [11121403, 11434015] ; 973 projects [2010CB922904, 2011CB921500] ; 973 projects [2010CB922904, 2011CB921500] ; 973 projects [2010CB922904, 2011CB921500] ; 973 projects [2010CB922904, 2011CB921500]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21508
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWang, HT (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Sui, XH,Wang, HT,Tang, H,et al. Quasiparticle density of states by inversion with maximum entropy method[J]. PHYSICAL REVIEW B,2016,94(14):144505.
APA Sui, XH,Wang, HT,Tang, H,Su, ZB,&Wang, HT .(2016).Quasiparticle density of states by inversion with maximum entropy method.PHYSICAL REVIEW B,94(14),144505.
MLA Sui, XH,et al."Quasiparticle density of states by inversion with maximum entropy method".PHYSICAL REVIEW B 94.14(2016):144505.
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