Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: Photon echo versus double quantum coherence
V. Delmonte,V. Delmonte,Judith F. Specht,Tomasz Jakubczyk,Tomasz Jakubczyk,Sven Höfling,Sven Höfling,Martin Kamp,Christian Schneider,Wolfgang Werner Langbein,Gilles Nogues,Gilles Nogues,Marten Richter,Jacek Kasprzak,Jacek Kasprzak +14 more
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In this paper, the authors employ two-dimensional coherent, nonlinear spectroscopy to investigate couplings within individual InAs quantum dots (QD) and InAs QD molecules.Abstract:
We employ two-dimensional (2D) coherent, nonlinear spectroscopy to investigate couplings within
individual InAs quantum dots (QD) and QD molecules. Swapping pulse ordering in a two-beam
sequence permits to distinguish between rephasing and non-rephasing four-wave mixing (FWM)
configurations. We emphasize the non-rephasing case, allowing to monitor two-photon coherence
dynamics. Respective Fourier transform yields a double quantum 2D FWM map, which is corroborated
with its single quantum counterpart, originating from the rephasing sequence. We introduce
referencing of the FWM phase with the one carried by the driving pulses, overcoming the necessity
of its active-stabilization, as required in 2D spectroscopy. Combining single and double quantum
2D FWM, provides a pertinent tool in detecting and ascertaining coherent coupling mechanisms
between individual quantum systems, as exemplified experimentally.read more
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Journal ArticleDOI
Multidimensional Coherent Spectroscopy of Semiconductors
Journal ArticleDOI
Inducing coherent quantum dot interactions
Eric W. Martin,Steven T. Cundiff +1 more
TL;DR: In this article, the authors demonstrate an induced binding between two distinct QDs with a very weak excitation of delocalized quantum-well states, which is presented as a possible method for turning on coupling between quantum states and for measuring fundamental processes in semiconductors with nanometer spatial resolution.
Journal ArticleDOI
Observing Multiexciton Correlations in Colloidal Semiconductor Quantum Dots via Multiple-Quantum Two-Dimensional Fluorescence Spectroscopy
TL;DR: In this article, the authors employed multiple-quantum 2D fluorescence spectroscopy on colloidal CdSe1-xSx/ZnS alloyed core/shell quantum dots to selectively map the electronic structure of multiexcitons and their correlations.
Journal Article
Coherent and incoherent coupling dynamics between neutral and charged excitons in monolayer MoSe2
Lixiang Xu,Kai Hao,Philipp Nagler,Akshay Singh,Kha Tran,Chandriker Kavir Dass,Christian Schüller,Tobias Korn,Xiaoqin Li,Galan Moody +9 more
TL;DR: This work reveals the coherent and incoherent nature of exciton-trion coupling and the relevant time scales in monolayer MoSe2 using optical two-dimensional coherent spectroscopy.
DissertationDOI
Theory of multidimensional spectroscopy and excitation transfer processes in nanostructures
TL;DR: In this paper, the authors developed theoretical models to study coherent couplings and excitation transfer mechanisms in nanostructures and aimed at a microscopic understanding of the underlying Coulomb-mediated processes, thus, laying the foundation to access the full functionality of the studied quantum systems.
References
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Coherently wired light-harvesting in photosynthetic marine algae at ambient temperature
Elisabetta Collini,Cathy Y. Wong,Krystyna E. Wilk,Paul M. G. Curmi,Paul Brumer,Gregory D. Scholes +5 more
TL;DR: Observations provide compelling evidence for quantum-coherent sharing of electronic excitation across the 5-nm-wide proteins under biologically relevant conditions, suggesting that distant molecules within the photosynthetic proteins are ‘wired’ together by quantum coherence for more efficient light-harvesting in cryptophyte marine algae.
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Two-dimensional spectroscopy of electronic couplings in photosynthesis
Tobias Brixner,Tobias Brixner,Jens Stenger,Jens Stenger,Harsha M. Vaswani,Harsha M. Vaswani,Minhaeng Cho,Robert E. Blankenship,Graham R. Fleming +8 more
TL;DR: This work directly measures electronic couplings in a molecular complex, the Fenna–Matthews–Olson photosynthetic light-harvesting protein, and finds distinct energy transport pathways that depend sensitively on the detailed spatial properties of the delocalized excited-state wavefunctions of the whole pigment–protein complex.
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NMR techniques for quantum control and computation
TL;DR: In this article, a broad variety of pulse control and tomographic techniques have been developed for, and used in, NMR quantum computation and many of these will be useful in other quantum systems now being considered for the implementation of quantum information processing tasks.
Journal ArticleDOI
Structure of the amide i band of peptides measured by femtosecond nonlinear-infrared spectroscopy
TL;DR: In this paper, a femtosecond pump probe and dynamic hole burning experiments were used to examine the ultrafast response of the modes in the 1600−1700 cm-1 region (the so-called amide I modes) of N-methylacetamide (NMA) and three small globular peptides, apamin, scyllatoxin, and bovine pancreatic trypsin inhibitor (BPTI).
Journal ArticleDOI
Ultralong Dephasing Time in InGaAs Quantum Dots
Paola Borri,Wolfgang Werner Langbein,S. Schneider,Ulrike Woggon,Roman Sellin,D. Ouyang,Dieter Bimberg +6 more
TL;DR: Between 7 and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian line shape with a lifetime-limited zero-phonon line and a broadband from elastic exciton-acoustic phonon interactions.