Ultrafast field-resolved semiconductor spectroscopy utilizing quantum interference control of currents

Ruppert, Claudia; Lohrenz, J.; Thunich, Sebastian; Betz, M.

doi:10.1364/ol.37.003879

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…By adjusting τ beyond the cross-correlation envelope, one might expect the two-color injection current to be completely suppressed, allowing the possibility of independently measuring a shift current and comparing it to the injection current. However, it has been shown before [37], and confirmed below, that this is not the case; an individual shift current can be reliably measured only by blocking the second pump.…”

Section: Methodsmentioning

confidence: 82%

Identification of photocurrents in topological insulators

Bas¹,

Muniz²,

Babakiray³

et al. 2016

Opt. Express

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Optical injection and detection of charge currents can complement conventional transport and photoemission measurements without the necessity of invasive contact that may disturb the system being examined. This is a particular concern for the surface states of a topological insulator. In this work one-and two-color sources of photocurrents are examined in epitaxial, thin films of Bi2Se3. We demonstrate that optical excitation and terahertz detection simultaneously captures one-and twocolor photocurrent contributions, as previously not required in other material systems. A method is devised to isolate the two components, and in doing so each can be related to surface or bulk excitations through symmetry. This strategy allows surface states to be examined in a model system, where they have independently been verified with angle-resolved photoemission spectroscopy.

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Section: Methodsmentioning

confidence: 82%

Identification of photocurrents in topological insulators

Bas¹,

Muniz²,

Babakiray³

et al. 2016

Opt. Express

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show abstract

“…Directly after a pulsed photoexcitation, the presence of a large density of (photogenerated) charge carriers can alter the Coulomb screening in monolayer TMDs [22][23][24][25][26][27][28][29], such that both the quasi-particle band gap and the excitonic binding energies are renormalized on femtosecond time scales. The renormalization effects are based upon an interplay of excitation-induced dephasing, phasespace filling and the screening of Coulomb interaction in combination with ultrafast non-radiative relaxation and recombination processes [22][23][24][25][26]30]. Furthermore, monolayer TMDs exhibit valley-contrasting angular momentum selection rules, allowing for valley-selective excitation with a corresponding out-of-plane spin orientation under circularly polarized excitation [31].…”

Section: Introductionmentioning

confidence: 99%

Light-field and spin-orbit-driven currents in van der Waals materials

et al. 2020

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AbstractThis review aims to provide an overview over recent developments of light-driven currents with a focus on their application to layered van der Waals materials. In topological and spin-orbit dominated van der Waals materials helicity-driven and light-field-driven currents are relevant for nanophotonic applications from ultrafast detectors to on-chip current generators. The photon helicity allows addressing chiral and non-trivial surface states in topological systems, but also the valley degree of freedom in two-dimensional van der Waals materials. The underlying spin-orbit interactions break the spatiotemporal electrodynamic symmetries, such that directed currents can emerge after an ultrafast laser excitation. Equally, the light-field of few-cycle optical pulses can coherently drive the transport of charge carriers with sub-cycle precision by generating strong and directed electric fields on the atomic scale. Ultrafast light-driven currents may open up novel perspectives at the interface between photonics and ultrafast electronics.

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Unveiling the interplay of Mollow physics and perturbed free induction decay by nonlinear optical signals of a dynamically driven two-level system

Kaspari,

Bracht,

Boos

et al. 2024

Phys. Rev. Research

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Nonlinear optical signals in optically driven quantum systems can reveal coherences and thereby open up the possibility for manipulation of quantum states. While the limiting cases of ultrafast and continuous-wave excitation have been extensively studied, the time dynamics of finite pulses bear interesting phenomena. In this paper, we explore the nonlinear optical probe signals of a two-level system excited with a laser pulse of finite duration. In addition to the prominent Mollow peaks, the probe spectra feature several smaller peaks for certain time delays. Similar features have been recently observed for resonance fluorescence signals [K. Boos , ]. We discuss that the emergent phenomena can be explained by a combination of Mollow triplet physics and perturbed free induction decay effects, providing an insightful understanding of the underlying physics. Published by the American Physical Society 2024

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Ultrafast field-resolved semiconductor spectroscopy utilizing quantum interference control of currents

Cited by 5 publications

References 12 publications

Identification of photocurrents in topological insulators

Identification of photocurrents in topological insulators

Light-field and spin-orbit-driven currents in van der Waals materials

Unveiling the interplay of Mollow physics and perturbed free induction decay by nonlinear optical signals of a dynamically driven two-level system

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