Ultrafast photocarrier dynamics in a 3D Dirac semimetal Cd3As2 film studied with terahertz spectroscopy

Zhang, Wenjie; Yang, Yunkun; Suo, Peng; Zhao, Wanying; Guo, Jiajia; Lü, Qi; Lin, Xian; Jin, Zuanming; Wang, Lin; Chen, Gang; Xiu, Faxian; Liu, Weimin; Zhang, Chao; Ma, Guohong

doi:10.1063/1.5086085

Cited by 50 publications

(48 citation statements)

References 59 publications

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“…In the case of Cd 3 As 2 , we also include the estimate of the lifetime of the transient excitonic state,

τ \approx 6

ps based on experimental results of ref. [].…”

Section: Discussion and Experimental Feasibilitymentioning

confidence: 99%

“…The overall lifetime of photoexcited carriers was found to be of the order of few picoseconds . A recent study by Zhang et al . showed evidence of population inversion in Cd 3 As 2 DSM on the timescale of 6 ps.…”

Section: Introductionmentioning

confidence: 97%

“…Ultrafast spectroscopies have been used extensively to study electron dynamic in 2D DMs, for example, graphene and 3D TIs . Ultrafast dynamics of the recently discovered 3D DMs, that is, DSM and WSM, is a less explored topic but pump‐probe studies similar to 2D DMs have recently appeared in the literature . In particular, relaxation dynamics was studied in TaAs, NbP and NbAs WSMs, and in Cd 3 As 2 DSM …”

Section: Introductionmentioning

confidence: 99%

“…Prominent recent examples include novel dynamical states in periodically driven systems, such as Floquet topological recently appeared in the literature. [55][56][57][58][59][60][61] In particular, relaxation dynamics was studied in TaAs, [57,59] NbP [59] and NbAs [60] WSMs, and in Cd 3 As 2 DSM. [61,62] An important result of the pump-probe studies in DMs is the possibility of creating a broadband population inversion.…”

Section: Introductionmentioning

confidence: 99%

“…[55][56][57][58][59][60][61] In particular, relaxation dynamics was studied in TaAs, [57,59] NbP [59] and NbAs [60] WSMs, and in Cd 3 As 2 DSM. [61,62] An important result of the pump-probe studies in DMs is the possibility of creating a broadband population inversion. [46,63] In the context of optical pumping, population inversion is a situation when after initial rapid thermalization two independent Fermi-Dirac distributions are established, with distinct chemical potentials for the non-equilibrium electron and hole populations (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Pertsova

Balatsky

2020

Annalen der Physik

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Driven and non‐equilibrium quantum states of matter have attracted growing interest in both theoretical and experimental studies in condensed matter physics. Recent progress in realizing transient collective states in driven or pumped Dirac materials (DMs) is reviewed herein. In particular, the focus is on optically pumped DMs which are a promising platform for transient excitonic instabilities. Optical pumping combined with the linear (Dirac) dispersion of the electronic spectrum offers a knob for tuning the effective interaction between the photoexcited electrons and holes, and thus provides a way of reducing the critical coupling for excitonic instability. As a result, a transient excitonic condensate could be achieved in a pumped DM while it is not feasible in equilibrium. A unifying theoretical framework is provided for describing transient collective states in 2D and 3D DMs. The experimental signatures are described and numerical estimates of the size of the dynamically induced excitonic gaps and the values of the critical temperatures for several specific systems, are summarized. In addition, general guidelines for identifying promising material candidates are discussed. Finally, comments are provided regarding recent experimental efforts in realizing transient excitonic condensate in pumped DMs, and outstanding issues and possible future directions are outlined.

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“…In the case of Cd 3 As 2 , we also include the estimate of the lifetime of the transient excitonic state,

τ \approx 6

ps based on experimental results of ref. [].…”

Section: Discussion and Experimental Feasibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Pertsova

Balatsky

2020

Annalen der Physik

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Second‐Harmonic and Third‐Harmonic Generations in2DLayered Materials

Jin,

Zhao

2023

Two‐Dimensional Materials for Nonlinear Optics

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High Mobility 3D Dirac Semimetal (Cd₃As₂) for Ultrafast Photoactive Terahertz Photonics

Dai

Manjappa

Yang

et al. 2021

Adv Funct Materials

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The Dirac semimetal cadmium arsenide (Cd3As2), a 3D electronic analog of graphene, has sparked renewed research interests for its novel topological phases and excellent optoelectronic properties. The gapless nature of its 3D electronic band facilitates strong optical nonlinearity and supports Dirac plasmons that are of particular interest to realize high‐performance electronic and photonic devices at terahertz (1 THz = 4.1 meV) frequencies, where the performance of most dynamic materials are limited by the tradeoff between power‐efficiency and switching speed. Here, all‐optical, low‐power, ultrafast broadband modulation of terahertz waves using an ultrathin film (100 nm, λ/3000) of Cd3As2 are experimentally demonstrated through active tailoring of the photoconductivity. The measurements reveal the photosensitive metallic behavior of Cd3As2 with high terahertz electron mobility of 7200 cm2 (Vs)−1. In addition, optical fluence dependent ultrafast charge carrier relaxation (15.5 ps), terahertz mobility, and long momentum scattering time (157 fs) comparable to superconductors that invoke kinetic inductance at terahertz frequencies are demonstrated. These remarkable properties of 3D Dirac topological semimetal envision a new class of power‐efficient, high speed, compact, tunable electronic, and photonic devices.

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Ultrafast photocarrier dynamics in a 3D Dirac semimetal Cd3As2 film studied with terahertz spectroscopy

Abstract: The topological three-dimensional Dirac semimetal Cd3As2 has drawn great attention for the novel physics and promising applications in optoelectronic devices operating in the infrared and THz regimes. Among the extensive studies in the past

Cited by 50 publications

References 59 publications

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Second‐Harmonic and Third‐Harmonic Generations in2DLayered Materials

High Mobility 3D Dirac Semimetal (Cd₃As₂) for Ultrafast Photoactive Terahertz Photonics

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Ultrafast photocarrier dynamics in a 3D Dirac semimetal Cd3As2 film studied with terahertz spectroscopy

Abstract: The topological three-dimensional Dirac semimetal Cd3As2 has drawn great attention for the novel physics and promising applications in optoelectronic devices operating in the infrared and THz regimes. Among the extensive studies in the past

Cited by 50 publications

References 59 publications

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Second‐Harmonic and Third‐Harmonic Generations in2DLayered Materials

High Mobility 3D Dirac Semimetal (Cd3As2) for Ultrafast Photoactive Terahertz Photonics

Contact Info

Product

Resources

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High Mobility 3D Dirac Semimetal (Cd₃As₂) for Ultrafast Photoactive Terahertz Photonics