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Lu, Wei; Ge, Shaofeng; Liu, Xuefeng; Lu, Hong; Li, Caizhen; Lai, Jiawei; Zhao, Chen; Liao, Zhi-Min; Jia, Shuang; Sun, Dong

doi:10.1103/physrevb.95.024303

Cited by 48 publications

(37 citation statements)

References 78 publications

(58 reference statements)

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“…It is worth noting that in semimetals, the excited carriers can relax fast to the equilibrium state near the Fermi level via intraband processes like electron–electron and electron–phonon scattering. The relaxation time around Fermi surface is only about several picoseconds for semimetals like graphene (4–11 ps) and Cd 3 As 2 (≈4 ps) . Therefore, in our case, it is reasonable to deduce that the sudden drop of the interband relaxation time indicates the disappearing of the slow interband relaxation process and thus the transition from semiconductor to semimetal.…”

Section: Resultsmentioning

confidence: 57%

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe₂

Wang

Zhang

McEvoy

et al. 2019

Laser & Photonics Reviews

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The demand for an ultrabroad optical material with a bandgap tunable from zero to at least 1-2 eV has been one of the driving forces for exploring new 2D materials since the emergence of graphene, transition metal dichalcogenides, and black phosphorus. As an ultra-broadband 2D material with energy bandgap ranging from 0 to 1.2 eV, PtSe 2 shows much better air stability than its analogue, black phosphorous. In this work, the superior nonlinear optical performance and ultrafast dynamics of layered PtSe 2 , and signatures of the transition from semiconductor to semimetal are systematically studied. Combining with rate equations, first-principles calculation, and electrical measurements, a comprehensive understanding about the evolution of nonlinear absorption and carrier dynamics with increasing layer thickness is provided, indicating its promising potential in nanophotonic devices such as infrared detectors, optical switches, and saturable absorbers.

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Section: Resultsmentioning

confidence: 57%

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe₂

Wang

Zhang

McEvoy

et al. 2019

Laser & Photonics Reviews

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“…These latter experiments show that a hot carrier distribution is obtained after 400-500 fs, after which the charge carriers relax by two processes. Subsequent pump-probe experiments using mid-infrared [98] and THz probe [99] confirm this two-process relaxation, which can be qualitatively reproduced using a two temperature model. The energies of cyclotron resonance excitations observed in Ref.…”

Section: Optical Propertiesmentioning

confidence: 66%

“…The renewed interest in Cd 3 As 2 motivated several groups to take a fresh look at the optical, magnetooptical, and ultra fast optical properties of this material [37,46,51,54,77,92,[95][96][97][98][99]. Thanks to this, to the best of our knowledge, the optical conductivity of Cd 3 As 2 (Fig.…”

Section: Optical Propertiesmentioning

confidence: 99%

3D Dirac semimetal Cd3As2 : A review of material properties

Crassee

Sankar

Lee

et al. 2018

Phys. Rev. Materials

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Cadmium arsenide (Cd3As2) -a time-honored and widely explored material in solid-state physics -has recently attracted considerable attention. This was triggered by a theoretical prediction concerning the presence of 3D symmetry-protected massless Dirac electrons, which could turn Cd3As2 into a 3D analogue of graphene. Subsequent extended experimental studies have provided us with compelling experimental evidence of conical bands in this system, and revealed a number of interesting properties and phenomena. At the same time, some of the material properties remain the subject of vast discussions despite recent intensive experimental and theoretical efforts, which may hinder the progress in understanding and applications of this appealing material. In this review, we focus on the basic material parameters and properties of Cd3As2, in particular those which are directly related to the conical features in the electronic band structure of this material. The outcome of experimental investigations, performed on Cd3As2 using various spectroscopic and transport techniques within the past sixty years, is compared with theoretical studies. These theoretical works gave us not only simplified effective models, but more recently, also the electronic band structure calculated numerically using ab initio methods.

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“…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%

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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Ultrafast relaxation dynamics of photoexcited Dirac fermions in the three-dimensional Dirac semimetalCd3As2

Cited by 48 publications

References 78 publications

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe₂

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe₂

3D Dirac semimetal Cd3As2 : A review of material properties

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

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Ultrafast relaxation dynamics of photoexcited Dirac fermions in the three-dimensional Dirac semimetalCd3As2

Cited by 48 publications

References 78 publications

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe2

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe2

3D Dirac semimetal Cd3As2 : A review of material properties

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

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Product

Resources

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Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe₂

Nonlinear Optical Signatures of the Transition from Semiconductor to Semimetal in PtSe₂