Attosecond Inter- and Intra-Band Charge Carrier Dynamics in Germanium

Inzani, Giacomo; Adamska, Lyudmyla; D’Onofrio, Luciano Jacopo; Moio, Bruno; Dolso, Gian Luca; Palo, Nicola Di; Eskandari-asl, Amir; Lamperti, Alessio; Molle, Alessandro; Rozzi, Carlo Andrea; Borrego-Varillas, Rocío; Nisoli, M.; Pittalis, Stefano; Avella, Adolfo; Lucchini, Matteo

doi:10.1364/up.2022.w4a.32

Cited by 3 publications

(12 citation statements)

References 7 publications

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“…A detailed description of the experimental setup is reported elsewhere. 12,13 An intense (∼ 7.75 V/nm), fewfemtosecond (∼ 10 fs) IR pulse ( ω IR 1.55 eV) promotes electrons from the valence to the conduction band of Ge (Fig. 1(a), top panel).…”

Section: Resultsmentioning

confidence: 99%

“…A systematic investigation of the above-absorptionedge features allows directly relating them to peaks in the conduction band density of states. 12,14 When the IR light excites the sample, its reflectivity changes as a function of the XUV photon energy, E, and the relative delay between the pump and the probe, τ . Figure 1…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…This apparent charge redistribution from one side to the other of the first Brillouin zone is related to intra-band motion. 12 However, for any of these groups, different pairs of bands can also be resonant with a larger number of IR photons, making different multi-photon transitions contribute to their number of excited electrons. For the single-photon groups and yellow in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…We demonstrate that photoinjection in Ge arises from the combination of multi-photon transitions, intra-band motion, and band dressing while tunnelling at the minimum direct energy gap only has a transient character. 12 In addition, we surprisingly found that intra-band motion hinders charge injection. By unveiling photoinjection in a realistic scenario, this work is a first step towards optically controlling charges in semiconductors, which would be a breakthrough in information technology.…”

Section: Introductionmentioning

confidence: 88%

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Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy

Inzani,

Adamska,

Eskandari-asl

et al. 2024

Ultrafast Phenomena and Nanophotonics XXVIII

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Light fields can sculpt the optical and electronic properties of solids by injecting charge carriers from the valence to the conduction band. The photoinjection process typically unfolds on time scales shorter than the period of the driving radiation, thus being -for visible and near-infrared light -below one femtosecond. Despite being pervasive, only a few experiments investigated the photoinduced charge excitation produced by an intense, ultrashort laser pulse with attosecond temporal resolution. Here we used attosecond transient reflection spectroscopy in combination with a two-fold, advanced theoretical approach to demonstrate that there is not a single photoexcitation mechanism responsible for charge injection in germanium. Instead, it stems from multi-photon absorption and band dressing, while intra-band motion has a hindering effect.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

See 3 more Smart Citations

Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy

Inzani,

Adamska,

Eskandari-asl

et al. 2024

Ultrafast Phenomena and Nanophotonics XXVIII

View full text Add to dashboard Cite

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Out-of-equilibrium Hubbard dimer within DPOA

Eskandari-asl,

Avella

2024

Advances in Ultrafast Condensed Phase Physics IV

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We have studied the Hubbard model on a dimer under the effect of an intense ultra-short laser pulse using the Dynamical Projective Operatorial Approach (DPOA). This shows how DPOA, stemming from the Composite Operator Method, can effectively tackle strongly correlated systems and real materials. To study the effect of the pump pulse on the anti-ferromagnetic-like order, we have analyzed the behavior of the double occupancy. It turns out that the pulse, in a specific range of its parameters, can drive the system in and out of the otherwise very robust anti-ferromagnetic-like phase that naturally emerges at half-filling and low temperatures. In such a situation, the system undergoes Rabi-like oscillations.

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Dynamical projective operatorial approach (DPOA) for pump-probe setups in the ultrafast regime

Eskandariasl,

Avella

2024

Advances in Ultrafast Condensed Phase Physics IV

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Recent experimental advancements in ultrafast pump-probe setups drive a growing need for efficient and insightful theoretical methods. This study will delve into the intricacies of our newly developed approach, the Dynamical Projective Operatorial Approach (DPOA). DPOA stands out as a highly efficient model-Hamiltonian method capable of calculating a wide range of single/multi-time single/multi-particle properties, such as excitation populations, out-of-equilibrium Green's functions, TR-ARPES signals, and various response functions. When dealing with transient optical properties, utilizing the DPOA formulation and capitalizing on the weak intensity of the probe pulse, we efficiently compute the linear response of the pumped system to a generic probe pulse, significantly accelerating calculations. Alongside the theoretical framework, we present noteworthy results that experimentalists can utilize to establish connections between observed effects and their underlying physical phenomena.

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Attosecond Inter- and Intra-Band Charge Carrier Dynamics in Germanium

Abstract: The interplay between intra-band motion and inter-band transitions in photoexcited germanium is investigated by attosecond transient reflection spectroscopy. Advanced theoretical simulations interpret the sub-femtosecond optical response as charge carrier dynamics in the band structure.

Cited by 3 publications

References 7 publications

Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy

Photoexcitation in germanium probed by attosecond transient reflectivity spectroscopy

Out-of-equilibrium Hubbard dimer within DPOA

Dynamical projective operatorial approach (DPOA) for pump-probe setups in the ultrafast regime

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