Femtosecond electron-phonon lock-in by photoemission and x-ray free-electron laser

被引：210

作者：

Gerber, S. ^{[1
,2
,3
,4
]}

Yang, S. -L. ^{[1
,2
,5
]}

Zhu, D. ^{[6
]}

Soifer, H. ^{[1
,2
]}

Sobota, J. A. ^{[1
,2
,7
]}

Rebec, S. ^{[1
,2
,5
]}

Lee, J. J. ^{[1
,2
,5
]}

Jia, T. ^{[1
,2
,5
]}

Moritz, B. ^{[1
,2
]}

Jia, C. ^{[1
,2
]}

Gauthier, A. ^{[1
,2
,5
]}

Li, Y. ^{[1
,2
]}

Leuenberger, D. ^{[1
,2
]}

Zhang, Y. ^{[8
]}

Chaix, L. ^{[1
,2
]}

Li, W. ^{[1
,2
]}

Jang, H. ^{[9
]}

Lee, J. -S. ^{[9
]}

Yi, M. ^{[10
]}

Dakovski, G. L. ^{[6
]}

Song, S. ^{[6
]}

Glownia, J. M. ^{[6
]}

Nelson, S. ^{[6
]}

Kim, K. W. ^{[11
]}

Chuang, Y. -D. ^{[7
]}

Hussain, Z. ^{[7
]}

Moore, R. G. ^{[1
,2
]}

Devereaux, T. P. ^{[1
,2
]}

Lee, W. -S. ^{[1
,2
]}

Kirchmann, P. S. ^{[1
,2
]}

Shen, Z. -X. ^{[1
,2
,5
]}

机构：

[1] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[2] Stanford Univ, Menlo Pk, CA 94025 USA

[3] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland

[4] Paul Scherrer Inst, Lab Micro & Nanotechnol, CH-5232 Villigen, Switzerland

[5] Stanford Univ, Dept Phys & Appl Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[6] SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA

[7] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[8] Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

[9] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA

[10] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[11] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, South Korea

来源：

SCIENCE | 2017年 / 357卷 / 6346期

基金：

瑞士国家科学基金会; 新加坡国家研究基金会;

关键词：

IRON PNICTIDES; SUPERCONDUCTIVITY; CHALCOGENIDES; STATES; FILMS; FESE;

D O I：

10.1126/science.aak9946

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：

The interactions that lead to the emergence of superconductivity in iron-based materials remain a subject of debate. It has been suggested that electron-electron correlations enhance electron-phonon coupling in iron selenide (FeSe) and related pnictides, but direct experimental verification has been lacking. Here we show that the electron-phonon coupling strength in FeSe can be quantified by combining two time-domain experiments into a "coherent lock-in" measurement in the terahertz regime. X-ray diffraction tracks the light-induced femtosecond coherent lattice motion at a single phonon frequency, and photoemission monitors the subsequent coherent changes in the electronic band structure. Comparison with theory reveals a strong enhancement of the coupling strength in FeSe owing to correlation effects. Given that the electron-phonon coupling affects superconductivity exponentially, this enhancement highlights the importance of the cooperative interplay between electron-electron and electron-phonon interactions.

引用

页码：71 / 74

页数：4

共 30 条

[1]

[Anonymous], 2008, MAT METHODS ARE AVAI

[2] Coherent excitations and electron-phonon coupling in Ba/EuFe2As2 compounds investigated by femtosecond time-and angle-resolved photoemission spectroscopy [J].

Avigo, I. ;

Cortes, R. ;

Rettig, L. ;

Thirupathaiah, S. ;

Jeevan, H. S. ;

Gegenwart, P. ;

Wolf, T. ;

Ligges, M. ;

Wolf, M. ;

Fink, J. ;

Bovensiepen, U. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2013, 25 (09)

[3] THEORY OF SUPERCONDUCTIVITY [J].

BARDEEN, J ;

COOPER, LN ;

SCHRIEFFER, JR .

PHYSICAL REVIEW, 1957, 108 (05) :1175-1204

[4] Linac Coherent Light Source: The first five years [J].

Bostedt, Christoph ;

Boutet, Sebastien ;

Fritz, David M. ;

Huang, Zhirong ;

Lee, Hae Ja ;

Lemke, Henrik T. ;

Robert, Aymeric ;

Schlotter, William F. ;

Turner, Joshua J. ;

Williams, Garth J. .

REVIEWS OF MODERN PHYSICS, 2016, 88 (01)

[5] Direct characterization of photoinduced lattice dynamics in BaFe2As2 [J].

Gerber, S. ;

Kim, K. W. ;

Zhang, Y. ;

Zhu, D. ;

Plonka, N. ;

Yi, M. ;

Dakovski, G. L. ;

Leuenberger, D. ;

Kirchmann, P. S. ;

Moore, R. G. ;

Chollet, M. ;

Glownia, J. M. ;

Feng, Y. ;

Lee, J. -S. ;

Mehta, A. ;

Kemper, A. F. ;

Wolf, T. ;

Chuang, Y. -D. ;

Hussain, Z. ;

Kao, C. -C. ;

Moritz, B. ;

Shen, Z. -X. ;

Devereaux, T. P. ;

Lee, W. -S. .

NATURE COMMUNICATIONS, 2015, 6

[6] Interplay between lattice and spin states degree of freedom in the FeSe superconductor: Dynamic spin state instabilities [J].

Gnezdilov, Vladimir ;

Pashkevich, Yurii G. ;

Lemmens, Peter ;

Wulferding, Dirk ;

Shevtsova, Tatiana ;

Gusev, Alexander ;

Chareev, Dmitry ;

Vasiliev, Alexander .

PHYSICAL REVIEW B, 2013, 87 (14)

[7]

Grimvall G., 1981, ELECT PHONON INTERAC

[8] Why Does Undoped FeSe Become a High-Tc Superconductor under Pressure? [J].

Imai, T. ;

Ahilan, K. ;

Ning, F. L. ;

McQueen, T. M. ;

Cava, R. J. .

PHYSICAL REVIEW LETTERS, 2009, 102 (17)

[9] The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides [J].

Johnston, David C. .

ADVANCES IN PHYSICS, 2010, 59 (06) :803-1061

[10]

Kim KW, 2012, NAT MATER, V11, P497, DOI [10.1038/NMAT3294, 10.1038/nmat3294]

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