Photo-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates

被引：34

作者：

Cilento, F. ^{[1
]}

Dal Conte, S. ^{[2
,3
]}

Coslovich, G. ^{[4
]}

Peli, S. ^{[2
,5
]}

Nembrini, N. ^{[2
,5
]}

Mor, S. ^{[2
]}

Banfi, F. ^{[2
,3
]}

Ferrini, G. ^{[2
,3
]}

Eisaki, H. ^{[6
]}

Chan, M. K. ^{[7
]}

Dorow, C. J. ^{[7
]}

Veit, M. J. ^{[7
]}

Greven, M. ^{[7
]}

van der Marel, D. ^{[8
]}

Comin, R. ^{[9
,10
]}

Damascelli, A. ^{[9
,10
]}

Rettig, L. ^{[11
,12
]}

Bovensiepen, U. ^{[11
,12
]}

Capone, M. ^{[13
,14
]}

Giannetti, C. ^{[2
,3
]}

Parmigiani, F. ^{[1
,4
]}

机构：

[1] Elettra Sincrotrone Trieste SCpA, I-34149 Basovizza, Italy

[2] Univ Cattolica Sacro Cuore, Dept Phys, I-25121 Brescia, Italy

[3] Univ Cattolica Sacro Cuore, I LAMP, I-25121 Brescia, Italy

[4] Univ Trieste, Dept Phys, I-34127 Trieste, Italy

[5] Univ Milan, Dept Phys, I-20133 Milan, Italy

[6] Natl Inst Adv Ind Sci & Technol, Nanoelect Res Inst, Tsukuba, Ibaraki 3058568, Japan

[7] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[8] Univ Geneva, Dept Phys Mat Condensee, CH-1211 Geneva, Switzerland

[9] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[10] Univ British Columbia, Quantum Matter Inst, Vancouver, BC V6T 1Z4, Canada

[11] Univ Duisburg Essen, Fak Phys, D-47048 Duisburg, Germany

[12] Univ Duisburg Essen, Zentrum Nanointegrat CENIDE, D-47048 Duisburg, Germany

[13] CNR IOM Democritos Natl Simulat Ctr, I-34136 Trieste, Italy

[14] SISSA, I-34136 Trieste, Italy

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

加拿大自然科学与工程研究理事会; 欧洲研究理事会; 瑞士国家科学基金会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTOR; PHASE-DIAGRAM; FLUCTUATIONS; ENERGY; ORDER; GAP;

D O I：

10.1038/ncomms5353

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A major challenge in understanding the cuprate superconductors is to clarify the nature of the fundamental electronic correlations that lead to the pseudogap phenomenon. Here we use ultrashort light pulses to prepare a non-thermal distribution of excitations and capture novel properties that are hidden at equilibrium. Using a broadband (0.5-2 eV) probe, we are able to track the dynamics of the dielectric function and unveil an anomalous decrease in the scattering rate of the charge carriers in a pseudogap-like region of the temperature (T) and hole-doping (p) phase diagram. In this region, delimited by a well-defined T*(neq)(p) line, the photoexcitation process triggers the evolution of antinodal excitations from gapped (localized) to delocalized quasiparticles characterized by a longer lifetime. The novel concept of photo-enhanced antinodal conductivity is naturally explained within the singleband Hubbard model, in which the short-range Coulomb repulsion leads to a k-space differentiation between nodal quasiparticles and antinodal excitations.

引用

页数：10

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