Enhancing the Hot-Phonon Bottleneck Effect in a Metal Halide Perovskite by Terahertz Phonon Excitation

Sekiguchi, Fumiya; Hirori, Hideki; Yumoto, Go; Shimazaki, Ai; Nakamura, Tomoya; Wakamiya, Atsushi; Kanemitsu, Yoshihiko

doi:10.1103/physrevlett.126.077401

Cited by 42 publications

(35 citation statements)

References 48 publications

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“…The enhanced hot-phonon bottleneck can explain this general carrier density dependence of HC cooling dynamics, which is widely observed in semiconductors and LHPs. 6,10,39,42,43 It is mainly induced by the presence of a non-equilibrium LO-phonon population in the phonon pool that reduces the net LO-phonon emission and enhances the cold carrier reheating, which consequently slows down the cooling process. 6,39,44 Excitation energy-dependent role of Mn doping in HC dynamics…”

Section: Sample Characterizationmentioning

confidence: 99%

Optimizing the quasi-equilibrium state of hot carriers in all-inorganic lead halide perovskite nanocrystals through Mn doping: fundamental dynamics and device perspectives

et al. 2022

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Section: Sample Characterizationmentioning

confidence: 99%

Optimizing the quasi-equilibrium state of hot carriers in all-inorganic lead halide perovskite nanocrystals through Mn doping: fundamental dynamics and device perspectives

et al. 2022

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“…The presence and an active role of hot phonons is also commonly revealed in the analysis of the time dependence of electronic properties upon nonequilibrium conditions. Given the plethora of ultrafast pump-probe experiments nowadays accessible, the physical properties under investigation can vary in a wide range, from optical probes (transmission [77,84,85,87,150,151], reflectivity [13,89,[110][111][112][152][153][154], absorption [91,[155][156][157][158]) to non-linear optics [86], time-resolved photoelectron spectroscopy [108,132,133,[159][160][161][162], photoluminescence [83,163], time-dependent Raman probes [164], ultrafast diffraction [6,44,109,126,[165][166][167][168][169][170][171].…”

Section: Detecting Hot Phononsmentioning

confidence: 99%

Properties and challenges of hot-phonon physics in metals: MgB$_2$ and other compounds

Cappelluti,

Caruso,

Novko

2022

Preprint

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The ultrafast dynamics of electrons and collective modes in systems out of equilibrium is crucially governed by the energy transfer from electronic degrees of freedom, where the energy of the pump source is usually absorbed, to lattice degrees of freedom. In conventional metals such process leads to an overall heating of the lattice, usually described by an effective lattice temperature T ph , until final equilibrium with all the degrees of freedom is reached. In specific materials, however, few lattice modes provide a preferential channel for the energy transfer, leading to a non-thermal distribution of vibrations and to the onset of hot phonons, i.e., lattice modes with a much higher population than the other modes. Hot phonons are usually encountered in semiconductors or semimetal compounds, like graphene, where the preferential channel towards hot modes is dictated by the reduced electronic phase space. Following a different path, the possibility of obtaining hot-phonon physics also in metals has been however also recently prompted in literature, as a result of a strong anisotropy of the electron-phonon (el-ph) coupling. In the present paper, taking MgB 2 as a representative example, we review the physical conditions that allow a hot-phonon scenario in metals with anisotropic el-ph coupling, and we discuss the observable fingerprints of hot phonons. Novel perspectives towards the prediction and experimental observation of hot phonons in other metallic compounds are also discussed. Contents 1 Introduction 32 Energy transfer and relaxation processes in time-resolved pump-probe experiments 7

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“…However, the thermalization process of some materials can be hindered by the so-called phonon bottleneck [2,3,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] that quenches the energy transfer between electron and lattice degrees of freedom. Such a physical phenomenon is usually encountered in semiconductors and semimetals where the pump-driven particle-hole excitations are restricted to few single points (valleys) in the Brillouin zone.…”

Section: Introductionmentioning

confidence: 99%

Fingerprints of hot-phonon physics in time-resolved correlated quantum lattice dynamics

Cappelluti,

Novko

2021

Preprint

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The time dynamics of the energy flow from electronic to lattice degrees of freedom in pump-probe setups could be strongly affected by the presence of a hot-phonon bottleneck, which can sustain longer coherence of the optically excited electronic states. Recently, hot-phonon physics has been experimentally observed and theoretically described in MgB 2 , the electron-phonon based superconductor with T c ≈ 39 K. By employing a combined ab-initio and quantum-field-theory approach and by taking MgB 2 as an example, here we propose a novel path for revealing the presence and characterizing the properties of hot phonons through a direct analysis of the information encoded in the lattice inter-atomic correlations. Such method exploits the underlying symmetry of the E 2g hot modes characterized by a out-of-phase in-plane motion of the two boron atoms. Since hot phonons occur typically at high-symmetry points of the Brillouin zone, with specific symmetries of the lattice displacements, the present analysis is quite general and it could aid in revealing the hot-phonon physics in other promising materials, such as graphene, boron nitride, or black phosphorus.

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Enhancing the Hot-Phonon Bottleneck Effect in a Metal Halide Perovskite by Terahertz Phonon Excitation

Cited by 42 publications

References 48 publications

Optimizing the quasi-equilibrium state of hot carriers in all-inorganic lead halide perovskite nanocrystals through Mn doping: fundamental dynamics and device perspectives

Optimizing the quasi-equilibrium state of hot carriers in all-inorganic lead halide perovskite nanocrystals through Mn doping: fundamental dynamics and device perspectives

Properties and challenges of hot-phonon physics in metals: MgB$_2$ and other compounds

Fingerprints of hot-phonon physics in time-resolved correlated quantum lattice dynamics

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