Ultrafast terahertz field control of electronic and structural interactions in vanadium dioxide

被引：55

作者：

Gray, A. X. ^{[1
,2
]}

Hoffmann, M. C. ^{[3
]}

Jeong, J. ^{[4
]}

Aetukuri, N. P. ^{[4
]}

Zhu, D. ^{[3
]}

Hwang, H. Y. ^{[5
]}

Brandt, N. C. ^{[5
]}

Wen, H. ^{[6
]}

Sternbach, A. J. ^{[7
,8
]}

Bonetti, S. ^{[1
]}

Reid, A. H. ^{[1
]}

Kukreja, R. ^{[1
,9
]}

Graves, C. ^{[1
,10
]}

Wang, T. ^{[1
,9
]}

Granitzka, P. ^{[1
,11
]}

Chen, Z. ^{[1
,12
]}

Higley, D. J. ^{[1
,10
]}

Chase, T. ^{[1
,10
]}

Jal, E. ^{[1
]}

Abreu, E. ^{[7
,13
]}

Liu, M. K. ^{[7
,14
]}

Weng, T-C ^{[15
]}

Sokaras, D. ^{[15
]}

Nordlund, D. ^{[15
]}

Chollet, M. ^{[3
]}

Alonso-Mori, R. ^{[3
]}

Lemke, H. ^{[3
]}

Glownia, J. M. ^{[3
]}

Trigo, M. ^{[1
]}

Zhu, Y. ^{[6
]}

Ohldag, H. ^{[15
]}

Freeland, J. W. ^{[6
]}

Samant, M. G. ^{[4
]}

Berakdar, J. ^{[16
]}

Averitt, R. D. ^{[7
,8
]}

Nelson, K. A. ^{[5
]}

Parkin, S. S. P. ^{[4
]}

Durr, H. A. ^{[1
,17
]}

机构：

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

[2] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

[3] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

[4] IBM Almaden Res Ctr, San Jose, CA 95120 USA

[5] MIT, Dept Chem, Cambridge, MA 02139 USA

[6] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[7] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA

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

[9] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[10] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[11] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands

[12] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[13] Swiss Fed Inst Technol, Inst Quantum Elect, CH-8006 Zurich, Switzerland

[14] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

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

[16] Martin Luther Univ Halle Wittenberg, Inst Phys, D-06099 Halle, Germany

[17] Uppsala Univ, Dept Phys & Astron, POB 516, S-75120 Uppsala, Sweden

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 04期

基金：

美国国家科学基金会;

关键词：

METAL-INSULATOR-TRANSITION; VO2; PHASE; LOCALIZATION; EXCITATION; PULSES; LIGHT;

D O I：

10.1103/PhysRevB.98.045104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Vanadium dioxide (VO2), an archetypal correlated-electron material, undergoes an insulator-metal transition near room temperature that exhibits electron-correlation-driven and structurally driven physics. Using ultrafast temperature- and fluence-dependent optical spectroscopy and x-ray scattering, we show that multiple interrelated electronic and structural processes in the nonequilibrium dynamics in VO2 can be disentangled in the time domain. Specifically, following intense subpicosecond terahertz (THz) electric-field excitation, a partial collapse of the insulating gap occurs within the first picosecond. At temperatures sufficiently close to the transition temperature and for THz peak fields above a threshold of approximately 1 MV/cm, this electronic reconfiguration initiates a change in lattice symmetry taking place on a slower timescale. We identify the kinetic energy increase of electrons tunneling in the strong electric field as the driving force, illustrating a promising method to control electronic and structural interactions in correlated materials on an ultrafast timescale.

引用

页数：11

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