Photoinduced Enhancement of the Charge Density Wave Amplitude

被引：48

作者：

Singer, A. ^{[1
]}

Patel, S. K. K. ^{[1
,2
]}

Kukreja, R. ^{[1
,2
]}

Uhlir, V. ^{[2
]}

Wingert, J. ^{[1
]}

Festersen, S. ^{[3
]}

Zhu, D. ^{[4
]}

Glownia, J. M. ^{[4
]}

Lemke, H. T. ^{[4
,6
]}

Nelson, S. ^{[4
]}

Kozina, M. ^{[4
]}

Rossnagel, K. ^{[3
]}

Bauer, M. ^{[3
]}

Murphy, B. M. ^{[3
,5
]}

Magnussen, O. M. ^{[3
,5
]}

Fullerton, E. E. ^{[2
]}

Shpyrko, O. G. ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Ctr Memory & Recording Res, La Jolla, CA 92093 USA

[3] Univ Kiel, Inst Expt & Appl Phys, D-24098 Kiel, Germany

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

[5] Univ Kiel, Ruprecht Haensel Lab, D-24098 Kiel, Germany

[6] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 05期

关键词：

ELECTRON; CHROMIUM; PHASE; ORDER; SUPERCONDUCTIVITY; EXCITATION; STATE;

D O I：

10.1103/PhysRevLett.117.056401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Symmetry breaking and the emergence of order is one of the most fascinating phenomena in condensed matter physics. It leads to a plethora of intriguing ground states found in antiferromagnets, Mott insulators, superconductors, and density-wave systems. Exploiting states of matter far from equilibrium can provide even more striking routes to symmetry-lowered, ordered states. Here, we demonstrate for the case of elemental chromium that moderate ultrafast photoexcitation can transiently enhance the charge-density-wave (CDW) amplitude by up to 30% above its equilibrium value, while strong excitations lead to an oscillating, large-amplitude CDW state that persists above the equilibrium transition temperature. Both effects result from dynamic electron-phonon interactions, providing an efficient mechanism to selectively transform a broad excitation of the electronic order into a well-defined, long-lived coherent lattice vibration. This mechanism may be exploited to transiently enhance order parameters in other systems with coupled degrees of freedom.

引用

页数：6

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