Explanipedia

Temperature Dependent Exciton Funnel Dynamics in Uniform Strain Gradient Field Observed by Time‐Resolved Photoluminescence Open

Xuewen Fu, Xiang Chen, Gwénolé Jacopin, Mehran Shahmohammadi, Chuwei Zhang , et al. · 2021

Elastic strain engineering is an important way to reversibly tune the properties of micro/nanoscale semiconductors for promising applications in the emerging advanced nanotechnologies, such as the strain enhanced high‐mobility transistors,…

Impact of alloy disorder on Auger recombination in single InGaN/GaN core-shell microrods Open

Wei Liu, Georg Rossbach, Akio Ueta, Tilman Schimpke, H.‐J. Lugauer , et al. · 2019

We study the influence of local inhomogeneities on carrier recombination dynamics in single InGaN/GaN core-shell microrods (MRs) by means of time-resolved microphotoluminescence (TRPL) at 10 K. At low carrier density (similar to 10(11) cm(…

Spatially dependent carrier dynamics in single InGaN/GaN core-shell microrod by time-resolved cathodoluminescence Open

Wei Liu, Christian Mounir, Georg Rossbach, Tilman Schimpke, Akio Ueta , et al. · 2018

The optical properties of InGaN/GaN core-shell microrods are studied by time-resolved cathodoluminescence. Probing the carrier dynamics along the length of the rod from 4 to 300 K enables us to decompose radiative (τr) and non-radiative (τ…

Doubly Dressed Bosons: Exciton Polaritons in a Strong Terahertz Field Open

Barbara Piętka, Nataliya Bobrovska, D. Stephan, M. Teich, Mateusz Król , et al. · 2017

We demonstrate the existence of a novel quasiparticle, an exciton in a semiconductor doubly dressed with two photons of different wavelengths: a near infrared cavity photon and terahertz (THz) photon, with the THz coupling strength approac…

exciton-polariton revealed in an external magnetic field Open

Barbara Piętka, Maciej R. Molas, Nataliya Bobrovska, Mateusz Król, Rafał Mirek , et al. · 2017

We demonstrate the existence of the excited state of an exciton-polariton in a semiconductor microcavity. The strong coupling of the quantum well heavy-hole exciton in an excited 2s state to the cavity photon is observed in nonzero magneti…

Periodic squeezing in a polariton Josephson junction Open

Albert F. Adiyatullin, Mitchell D. Anderson, H. Flayac, M. T. Portella‐Oberli, Fauzia Jabeen , et al. · 2017

Microcavity polaritons are a hybrid photonic system that arises from the strong coupling of confined photons to quantum-well excitons. Due to their light-matter nature, polaritons possess a Kerr-like nonlinearity while being easily accessi…

Spin anisotropic interactions of lower polaritons in the vicinity of polaritonic Feshbach resonance Open

Naotomo Takemura, Mitchell D. Anderson, M. Navadeh-Toupchi, D. Y. Oberli, M. T. Portella‐Oberli , et al. · 2017

We determine experimentally the spinor interaction constants of lower-polaritons $\alpha_1$ and $\alpha_2$ using resonant pump-probe spectroscopy with a spectrally narrow pump pulse. Our experimental findings are analyzed with the Bogoliub…

2s exciton-polariton revealed in an external magnetic field Open

Barbara Piętka, Maciej R. Molas, Nataliya Bobrovska, Mateusz Król, Rafał Mirek , et al. · 2017

We demonstrate the existence of the excited state of an exciton-polariton in a semiconductor microcavity. The strong coupling of the quantum well heavy-hole exciton in an excited 2s state to the cavity photon is observed in non-zero magnet…

Enhancement of Auger recombination induced by carrier localization in InGaN/GaN quantum wells Open

Mehran Shahmohammadi, W. Liu, Georg Rossbach, Lise Lahourcade, A. Dussaigne , et al. · 2017

The origin of efficiency droop in state-of-the-art quality In GaN/GaN and GaN/AlGaN quantum wells (QWs) grown on various crystal planes is studied by means of time-resolved photoluminescence spectroscopy associated with a precise determina…

Reservoir-induced decoherence of resonantly excited confined polaritons Open

C. Ouellet-Plamondon, Gregory Sallen, F. Morier‐Genoud, D. Y. Oberli, M. T. Portella‐Oberli , et al. · 2017

We report on the effect of decoherence on polariton bistability. The polariton hysteresis loop is shown to collapse in a similar way when increasing the temperature or under nonresonant excitation power. The hysteresis upward threshold is …

Carrier-density-dependent recombination dynamics of excitons and electron-hole plasma in -plane InGaN/GaN quantum wells Open

Wei Liu, R. Butté, A. Dussaigne, N. Grandjean, B. Deveaud , et al. · 2016

We study the carrier-density-dependent recombination dynamics in m-plane InGaN/GaN multiple quantum wells in the presence of n-type background doping by time-resolved photoluminescence. Based on Fermi's golden rule and Saha's equation, we …

Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities Open

Naotomo Takemura, Mitchell D. Anderson, S. Biswas, M. Navadeh-Toupchi, D. Y. Oberli , et al. · 2016

The interaction between coherent polaritons and incoherent excitons plays an important role in polariton physics. Using resonant pump-probe spectroscopy with selective excitation of single polariton branches, we investigate the different d…

Exciton dynamics at a single dislocation in GaN probed by picosecond time-resolved cathodoluminescence Open

Wei Liu, J.‐F. Carlin, N. Grandjean, B. Deveaud, Gwénolé Jacopin · 2016

We investigate the dynamics of donor bound excitons (D°XA) at T = 10 K around an isolated single edge dislocation in homoepitaxial GaN, using a picosecond time-resolved cathodoluminescence (TR-CL) setup with high temporal and spatial resol…

Comment on “Room Temperature Electrically Injected Polariton Laser” Open

B. Deveaud · 2016

In this Comment I challenge the main conclusions of Ref. [1]. The main reason for this Comment is the large number of questions on the details of the experiment that led me to request the raw data. I have obtained two sets of raw data. Aft…

Polariton interactions in semiconductor microcavities Open

B. Deveaud · 2016

In this review, we will try to summarize the results that we have obtained on the measurement of polariton interactions. We will describe here the samples, the experimental systems and some of the important results. We will also give a few…

Asymmetric Cathodoluminescence Emission in CH3NH3PbI3–xBrx Perovskite Single Crystals Open

M. Ibrahim Dar, Gwénolé Jacopin, Mahmoud Hezam, Neha Arora, Shaik M. Zakeeruddin , et al. · 2016

Probing local emission properties of organic-inorganic lead halide perovskite material can provide evidence regarding the photovoltaic performance of perovskite solar cells. Herein, cathodoluminescence, which has the potential to resolve e…

Spatial multistability induced by cross interactions of confined polariton modes Open

C. Ouellet-Plamondon, Gregory Sallen, F. Morier‐Genoud, D. Y. Oberli, M. T. Portella‐Oberli , et al. · 2016

We demonstrate the occurrence of spatial multistability using laterally confined microcavity exciton-polaritons. By coherently exciting with a blue detuned laser a series of confined polariton modes, we investigate the effects of multistab…

Photovoltaic and Amplified Spontaneous Emission Studies of High‐Quality Formamidinium Lead Bromide Perovskite Films Open

Neha Arora, M. Ibrahim Dar, Mahmoud Hezam, Wolfgang Tress, Gwénolé Jacopin , et al. · 2016

This study demonstrates the formation of extremely smooth and uniform formamidinium lead bromide (CH(NH 2 ) 2 PbBr 3 = FAPbBr 3 ) films using an optimum mixture of dimethyl sulfoxide and N , N ‐dimethylformamide solvents. Surface morpholog…

Dephasing effects on coherent exciton-polaritons and the breakdown of the strong coupling regime Open

Naotomo Takemura, Mitchell D. Anderson, Stéphane Trebaol, S. Biswas, D. Y. Oberli , et al. · 2015

Using femtosecond pump-probe spectroscopy, we identify excitation-induced dephasing as a major mechanism responsible for the breakdown of the strong coupling between excitons and photons in a semiconductor microcavity. The effects of depha…

Exciton hopping probed by picosecond time-resolved cathodoluminescence Open

Mehran Shahmohammadi, Gwénolé Jacopin, Xuewen Fu, Jean‐Daniel Ganière, Dapeng Yu , et al. · 2015

The exciton transport is studied in high quality ZnO microwires using time resolved cathodoluminescence. Owing to the available picosecond temporal and nanometer spatial resolution, a direct estimation of the exciton average speed has been…

Effect of a noisy driving field on a bistable polariton system Open

Hadis Abbaspour, Gregory Sallen, Stéphane Trebaol, F. Morier‐Genoud, M. T. Portella‐Oberli , et al. · 2015

We report on the effect of noise on the characteristics of the bistable\npolariton emission system. The present experiment provides a time resolved\naccess to the polariton emission intensity. We evidence the noise-induced\ntransitions bet…

Two-dimensional Fourier transform spectroscopy of exciton-polaritons and their interactions Open

Naotomo Takemura, Stéphane Trebaol, Mitchell D. Anderson, V. Kohnle, Yoan Léger , et al. · 2015

We investigate polariton-polariton interactions in a semiconductor\nmicrocavity through two-dimensional Fourier transform (2DFT) spectroscopy. We\nobserve, in addition to the lower-lower and the upper-upper polariton\nself-interaction, a l…

Multiple polariton modes originating from the coupling of quantum wells in planar microcavity Open

C. Ouellet-Plamondon, Gregory Sallen, Fauzia Jabeen, D. Y. Oberli, B. Deveaud · 2015

We report on the observation of multiple polariton modes, originating from an electronic coupling between quantum wells inside a planar microcavity. A series of excitonic transitions are measured for a bare quantum well stack and are preci…

Analytical method for determining quantum well exciton properties in a magnetic field Open

P. Stępnicki, Barbara Piętka, F. Morier‐Genoud, B. Deveaud, Michał Matuszewski · 2015

We develop an analytical approximate method for determining the Bohr radii of Wannier-Mott excitons in thin quantum wells under the influence of magnetic field perpendicular to the quantum well plane. Our hybrid variational-perturbative me…

Spinor stochastic resonance Open

Hadis Abbaspour, Stéphane Trebaol, F. Morier‐Genoud, M. T. Portella‐Oberli, B. Deveaud · 2015

We report on noise-induced-spin-ordering in a collective quasipaticle system:\nspinor stochastic resonance. Synergetic interplay of a polarization-modulated\nsignal and a polarization-noise allows us to switch coherently between the two\nm…

Exciton-Polariton Bose-Einstein Condensates Open

B. Deveaud · 2015

Exciton-polaritons, mixed light-matter quasiparticles in semiconductors, have recently shown evidence for Bose-Einstein condensation. Some of the properties of condensates of exciton-polaritons are reviewed in this article. We first discus…

Magnetic field tuning of exciton-polaritons in a semiconductor microcavity Open

Barbara Piętka, D. Zygmunt, Mateusz Król, Maciej R. Molas, A. A. L. Nicolet , et al. · 2015

We detail the influence of a magnetic field on exciton-polaritons inside a semiconductor microcavity. Magnetic field can be used as a tuning parameter for exciton and photon resonances. We discuss the change of the exciton energy, the osci…

B. Deveaud YOU? Author Swipe