Real-Time Observation of Phonon-Mediated σ-π Interband Scattering in MgB2

被引：16

作者：

Baldini, E. ^{[1
,2
]}

Mann, A. ^{[1
]}

Benfatto, L. ^{[3
,4
]}

Cappelluti, E. ^{[3
,4
]}

Acocella, A. ^{[5
]}

Silkin, V. M. ^{[6
,7
,8
]}

Eremeev, S. V. ^{[9
,10
]}

Kuzmenko, A. B. ^{[11
]}

Borroni, S. ^{[1
]}

Tan, T. ^{[12
]}

Xi, X. X. ^{[12
]}

Zerbetto, F. ^{[5
]}

Merlin, R. ^{[13
]}

Carbone, F. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland

[3] Univ Roma La Sapienza, CNR, Inst Complex Syst, I-00185 Rome, Italy

[4] Univ Roma La Sapienza, Phys Dept, I-00185 Rome, Italy

[5] Univ Bologna, Dept Chem G Ciamician, I-40126 Bologna, Italy

[6] Univ Basque Country, Dept Fis Mat, San Sebastian 20080, Spain

[7] Donostia Int Phys Ctr, San Sebastian 20080, Spain

[8] Basque Fdn Sci, Ikerbasque, Bilbao 48011, Spain

[9] Inst Strength Phys & Mat Sci, Tomsk 634055, Russia

[10] Tomsk State Univ, Tomsk 634050, Russia

[11] Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva 4, Switzerland

[12] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[13] Univ Michigan, Ctr Photon & Multiscale Nanomat, Dept Phys, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 09期

关键词：

DIELECTRIC-CONSTANT; ION DYNAMICS; ELECTRON; ENERGY; SUPERCONDUCTIVITY; PSEUDOPOTENTIALS; CONDUCTIVITY; FEMTOSECOND; MULTIBAND; ORIGIN;

D O I：

10.1103/PhysRevLett.119.097002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In systems having an anisotropic electronic structure, such as the layered materials graphite, graphene, and cuprates, impulsive light excitation can coherently stimulate specific bosonicmodes, with exotic consequences for the emergent electronic properties. Here we show that the population of E-2g phonons in the multiband superconductorMgB(2) can be selectively enhanced by femtosecond laser pulses, leading to a transient control of the number of carriers in the sigma-electronic subsystem. The nonequilibrium evolution of the material optical constants is followed in the spectral region sensitive to both the a- and c-axis plasma frequencies andmodeled theoretically, revealing the details of the sigma-pi interband scattering mechanism in MgB2.

引用

页数：6

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