Microscopic optical anisotropy of exciton-polaritons in a GaAs-based semiconductor microcavity

Lastras-Martı́nez, L. F.; Cerda‐Méndez, E. A.; Ulloa-Castillo, Nicolás A.; Herrera‐Jasso, R.; Rodríguez-Tapia, L. E.; Ruiz-Cigarrillo, O.; Castro-García, R.; Biermann, K.; Santos, P. V.

doi:10.1103/physrevb.96.235306

Cited by 4 publications

(5 citation statements)

References 18 publications

(29 reference statements)

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“…Measurements performed in other points of the sample revealed variation of the quadrupole energies up to 30%. This is consistent with the disorder effects reported in GaAs microcavities [42][43][44], as well as in bulk GaAs samples [18,40].…”

Section: Evaluation Of the Built-in Stress And Disordersupporting

confidence: 91%

“…From the quadrupole hamiltonian we also obtain an estimation of the gradient-elastic tensor that relates gradients of the electrostatic potential on each nuclear site with the strain tensor. Since we don't have an independent measurement of the stress present in the sample, we are limited to the determination of only relative values of the two relevant gradient-elastic tensor elements for different isotopes, S 11 and S 44…”

Section: Discussionmentioning

confidence: 99%

“…Importantly, NMR and re-magnetization measurements were done at very close points on the sample surface. Indeed, it has been shown that the strain varies in the plane of GaAs substrates, epilayers, quantum wells and microstructures [18,[40][41][42][43][44]. A different set of NMR experiments performed at another point yielded a smaller value of B N MR Q = 12 G, correlated with smaller B Q = 9 ± 2 G extracted from the corresponding re-magnetization experiments.…”

Section: Re-magnetization Of the Nss In The Presence Of The Quadrupol...mentioning

confidence: 95%

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Simultaneous measurements of nuclear spin heat capacity, temperature and relaxation in GaAs microstructures

Vladimirova,

Cronenberger,

Colombier

et al. 2021

Preprint

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Heat capacity of the nuclear spin system (NSS) in GaAs-based microstructures has been shown to be much greater than expected from dipolar coupling between nuclei, thus limiting the efficiency of NSS cooling by adiabatic demagnetization. It was suggested that quadrupole interaction induced by some small residual strain could provide this additional reservoir for the heat storage. We check and validate this hypothesis by combining nuclear spin relaxation measurements with adiabatic remagnetization and nuclear magnetic resonance experiments, using electron spin noise spectroscopy as a unique tool for detection of nuclear magnetization. Our results confirm and quantify the role of the quadrupole splitting in the heat storage within NSS and provide additional insight into fundamental, but still actively debated relation between a mechanical strain and the resulting electric field gradients in GaAs.

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Section: Evaluation Of the Built-in Stress And Disordersupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Re-magnetization Of the Nss In The Presence Of The Quadrupol...mentioning

confidence: 95%

See 1 more Smart Citation

Simultaneous measurements of nuclear spin heat capacity, temperature and relaxation in GaAs microstructures

Vladimirova,

Cronenberger,

Colombier

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The study of exciton-light interaction and its dependence on light polarization in a polariton microcavity has been reported in [9]. The optical response and dependence on polarization of a polariton microcavity are found to be inhomogeneous along the microcavity surface, measured using microreflectance anisotropy spectroscopy (µ-RAS) with a spatial resolution of 10.0 × 10.0µm 2 .…”

Section: Introductionmentioning

confidence: 99%

Quantifying Exciton-Photon Entanglement in Semiconductor Microcavities: A Closed Formula for Strong and Weak Coupling Regimes

Guerrero

2024

IEEE Photonics J.

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Semiconductor microcavities have great potential for quantum information science, quantum optics, and quantum sensing. Researchers designing devices based on these microcavities could benefit from having accurate figures of merit to guide their design and enhance the entanglement latency and strength of their devices. This article presents a closed formula for computing the exciton-photon concurrence in semiconductor microcavities. The formula is tailored for the ultralow density limit of both excitons and photons, allowing a better understanding of the entanglement properties in this regime.The closed formula allows for accurate and easy quantification of the exciton-photon coupling strength in terms of the parameters of the system like the couplings, frequencies, and linewidths, which has applications in quantum optics and quantum information science. The presented formulas can be used in rational microcavity design for various applications, such as single-photon sources, quantum light sources, and optoelectronic devices. This contributes to the systematic design and control of entanglement properties of quantum devices tailored for specific tasks in quantum information science, quantum optics, and quantum sensing.In summary, this work represents a valuable contribution to both practical applications and fundamental research in the fields of nanostructures, quantum optics, and quantum information science.

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“…The coupling between matter and light is related to the strength of the material’s transition dipole moment. Due to their large oscillator strengths, strong light–matter coupling has been observed from strongly absorbing lead halide perovskites, exciton transitions in direct band gap inorganic semiconductors, organic semiconductors, dye molecules, and fluorescent proteins. ,,− (6,5) Semiconducting single-walled CNTs were chosen for this work because their S 11 excited states (corresponding to their optical band gaps) have very strong transition dipole moments (11 Debye per unit cell for a (6,5) CNT) and narrow line widths, which readily allow for strong light–matter couplingas described in previous studies of CNT exciton polariton microcavities with strong and ultrastrong coupling. − CNTs also have strong exciton–phonon couplings and high exciton mobilities, both potentially useful to realize polariton condensation. − The CNT S 11 state denotes the bright, odd-parity, zero-momentum exciton. A phonon sideband of the KDE state (denoted by X 1 ) also strongly absorbs in CNTs (Figure A).…”

Section: Introductionmentioning

confidence: 99%

Population of Subradiant States in Carbon Nanotube Microcavities in the Ultrastrong Light–Matter Coupling Regime

et al. 2022

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Strong light–matter coupling results in eigenstates called polaritons which share the properties of both light and matter and provide a useful way to engineer electronic energies and behaviors. In this work, we study nearly monochiral (6,5) semiconducting carbon nanotubes (CNTs) in a Fabry–Pérot microcavity. Light–matter coupling leads to the formation of three bands of bright polariton states (upper, middle, and lowerresulting from coupling to the bright S11 CNT exciton and the X1 phonon sideband of the K-momentum dark exciton state). The structure also supports many exciton-like subradiant states at the bright S11 and X1 energies. Here, ultrafast transient reflection spectroscopy is used to study the dynamics and spectral signatures of excited subradiant-state polariton populations and the pathways by which they are populated. After a pump pulse, the excited subradiant-state population is revealed by (i) spectral signatures with relaxation times (∼5 ps) similar to those of CNT S11 band gap excitons outside of the cavity and (ii) a Rabi contraction of the lower polariton energy, whose magnitude quantifies the excited subradiant-state population. Data show that, following the excitation of the upper polariton (UP), the excited subradiant-state population is maximized at a sample position with a detuning of 118 meV, light–matter coupling of 336 meV, and UP transition energy of 1.52 eV. The excited subradiant-state population is reduced for other detunings. The X1 Hopfield coefficient of the UP also peaks at the same energy, revealing UP to X1 scattering as a potentially efficient relaxation pathway. These results will be important for understanding and controlling energy relaxation and transport in future CNT polariton devices.

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Microscopic optical anisotropy of exciton-polaritons in a GaAs-based semiconductor microcavity

Cited by 4 publications

References 18 publications

Simultaneous measurements of nuclear spin heat capacity, temperature and relaxation in GaAs microstructures

Simultaneous measurements of nuclear spin heat capacity, temperature and relaxation in GaAs microstructures

Quantifying Exciton-Photon Entanglement in Semiconductor Microcavities: A Closed Formula for Strong and Weak Coupling Regimes

Population of Subradiant States in Carbon Nanotube Microcavities in the Ultrastrong Light–Matter Coupling Regime

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