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

Gray, A. X.; Hoffmann, Matthias C.; Jeong, Jaewoo; Aetukuri, Nagaphani; Zhu, D.; Hwang, Harold Y.; Brandt, Nathaniel C.; Wen, HH; Sternbach, Aaron; Bonetti, Stefano; Reid, Alex; Kukreja, Roopali; Graves, Catherine E.; Wang, T.; Granitzka, Patrick W.; Chen, Z.; Higley, Daniel J.; Chase, T.; Jal, Emmanuelle; Abreu, Elsa; Liu, M. K.; Weng, T. L.; Sokaras, Dimosthenis; Nordlund, Dennis; Chollet, M.; Alonso‐Mori, R.; Lemke, Henrik T.; Glownia, James M.; Trigo, M.; Zhu, Ying; Ohldag, Hendrik; Freeland, J. W.; Samant, Mahesh G.; Berakdar, Jamal; Averitt, R. D.; Nelson, Keith A.; Parkin, Stuart S. P.; Dürr, H. A.

doi:10.1103/physrevb.98.045104

Cited by 58 publications

(41 citation statements)

References 55 publications

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“…Therefore, we conclude that after PIPT the VO 2 film expands along the rutile axis during a short time~a/s and then slowly shrinks. Such non-monotonic behavior has been observed earlier in some electron diffraction experiments [46][47][48][49][50][51] .…”

Section: Discussionsupporting

confidence: 76%

Large non-thermal contribution to picosecond strain pulse generation using the photo-induced phase transition in VO2

et al. 2020

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Picosecond strain pulses are a versatile tool for investigation of mechanical properties of meso-and nano-scale objects with high temporal and spatial resolutions. Generation of such pulses is traditionally realized via ultrafast laser excitation of a light-to-strain transducer involving thermoelastic, deformation potential, or inverse piezoelectric effects. These approaches unavoidably lead to heat dissipation and a temperature rise, which can modify delicate specimens, like biological tissues, and ultimately destroy the transducer itself limiting the amplitude of generated picosecond strain. Here we propose a non-thermal mechanism for generating picosecond strain pulses via ultrafast photo-induced first-order phase transitions (PIPTs). We perform experiments on vanadium dioxide VO 2 films, which exhibit a firstorder PIPT accompanied by a lattice change. We demonstrate that during femtosecond optical excitation of VO 2 the PIPT alone contributes to ultrafast expansion of this material as large as 0.45%, which is not accompanied by heat dissipation, and, for excitation density of 8 mJ cm −2 , exceeds the contribution from thermoelastic effect by a factor of five.

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Section: Discussionsupporting

confidence: 76%

Large non-thermal contribution to picosecond strain pulse generation using the photo-induced phase transition in VO2

et al. 2020

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“…Electrons and/or phonons may also form a nonequilibrium distribution within the respective subsystem, which cannot be characterized by an effective temperature [19][20][21]. Significant progress has been recently achieved in the understanding of nonequilibrium states of electrons and phonons at nanoscale [22][23][24][25][26]. However, a comprehensive microscopic understanding of current-induced thermal energy generation and transport has not yet emerged.…”

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confidence: 99%

Observation of Anomalous Non-Ohmic Transport in Current-Driven Nanostructures

et al. 2020

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Sufficiently large electric current applied to metallic nanostructures can bring them far out of equilibrium, resulting in non-Ohmic behaviors characterized by current-dependent resistance. We experimentally demonstrate a linear dependence of resistance on current in microscopic thin-film metallic wires at cryogenic temperatures, and show that our results are inconsistent with common non-Ohmic mechanisms such as Joule heating. As the temperature is increased, the linear dependence becomes smoothed out, resulting in the crossover to behaviors consistent with Joule heating. A plausible explanation for the observed behaviors is the strongly nonequilibrium distribution of phonons generated by the current. Analysis based on this interpretation suggests that the observed anomalous current-dependent resistance can provide information about phonon transport and electron-phonon interaction at nanoscale. The ability to control the properties of phonons generated by current can lead to new routes for the optimization of thermal properties of electronic nanodevices.

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“…The ultrafast IMT triggered by the fs pump laser extensively broadens the applications based on VO 2 , making VO 2 a promising candidate for high-speed THz modulators [ 58 ]. Except for the mentioned thermal and fs laser-based approach, recent efforts have shown that electrical field [ 59 , 60 , 61 , 62 , 63 ], continuous-wave (CW) laser [ 64 , 65 , 66 ], intense THz field [ 67 , 68 , 69 ] and electrochemical modification [ 70 , 71 , 72 ] can also provide effective control of IMT, and all these approaches can be integrated into THz devices.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Manipulation of THz Waves Enabled by Phase-Transition VO2 Thin Film

Lü

Gao

et al. 2021

Nanomaterials

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The reversible and multi-stimuli responsive insulator-metal transition of VO2, which enables dynamic modulation over the terahertz (THz) regime, has attracted plenty of attention for its potential applications in versatile active THz devices. Moreover, the investigation into the growth mechanism of VO2 films has led to improved film processing, more capable modulation and enhanced device compatibility into diverse THz applications. THz devices with VO2 as the key components exhibit remarkable response to external stimuli, which is not only applicable in THz modulators but also in rewritable optical memories by virtue of the intrinsic hysteresis behaviour of VO2. Depending on the predesigned device structure, the insulator-metal transition (IMT) of VO2 component can be controlled through thermal, electrical or optical methods. Recent research has paid special attention to the ultrafast modulation phenomenon observed in the photoinduced IMT, enabled by an intense femtosecond laser (fs laser) which supports “quasi-simultaneous” IMT within 1 ps. This progress report reviews the current state of the field, focusing on the material nature that gives rise to the modulation-allowed IMT for THz applications. An overview is presented of numerous IMT stimuli approaches with special emphasis on the underlying physical mechanisms. Subsequently, active manipulation of THz waves through pure VO2 film and VO2 hybrid metamaterials is surveyed, highlighting that VO2 can provide active modulation for a wide variety of applications. Finally, the common characteristics and future development directions of VO2-based tuneable THz devices are discussed.

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

Cited by 58 publications

References 55 publications

Large non-thermal contribution to picosecond strain pulse generation using the photo-induced phase transition in VO2

Large non-thermal contribution to picosecond strain pulse generation using the photo-induced phase transition in VO2

Observation of Anomalous Non-Ohmic Transport in Current-Driven Nanostructures

Dynamic Manipulation of THz Waves Enabled by Phase-Transition VO2 Thin Film

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