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267 results on '"Moody, Galan"'

54. Coherent Electronic Coupling in Atomically Thin MoSe2

Author

Singh, Akshay, Moody, Galan, Wu, Sanfeng, Wu, Yanwen, Ghimire, Nirmal J., Yan, Jiaqiang, Mandrus, David G., Xu, Xiaodong, and Li, Xiaoqin

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We report the first direct spectroscopic evidence for coherent electronic coupling between excitons and trions in atomically thin transition metal dichalcogenides, specifically monolayer MoSe2. Signatures of coupling appear as isolated cross-peaks in two-color pump-probe spectra, and the lineshape of the peaks reveals that the coupling originates from many-body interactions. Excellent agreement between the experiment and density matrix calculations suggests the formation of a correlated exciton-trion state due to their coupling., Comment: 5 pages, 3 figures

Published
2014
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55. Demonstration of sub-3 ps temporal resolution with a superconducting nanowire single-photon detector

Author

Korzh, Boris, Zhao, Qing-Yuan, Allmaras, Jason P., Frasca, Simone, Autry, Travis M., Bersin, Eric A., Beyer, Andrew D., Briggs, Ryan M., Bumble, Bruce, Colangelo, Marco, Crouch, Garrison M., Dane, Andrew E., Gerrits, Thomas, Lita, Adriana E., Marsili, Francesco, Moody, Galan, Peña, Cristián, Ramirez, Edward, Rezac, Jake D., Sinclair, Neil, Stevens, Martin J., Velasco, Angel E., Verma, Varun B., Wollman, Emma E., Xie, Si, Zhu, Di, Hale, Paul D., Spiropulu, Maria, Silverman, Kevin L., Mirin, Richard P., Nam, Sae Woo, Kozorezov, Alexander G., Shaw, Matthew D., and Berggren, Karl K.

Published
2020
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56. Coherent Excitonic Coupling in an Asymmetric Double InGaAs Quantum Well Arises from Many-Body Effects

Author

Nardin, Gael, Moody, Galan, Singh, Rohan, Autry, Travis M., Li, Hebin, Morier-Genoud, Francois, and Cundiff, Steven T.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We study an asymmetric double InGaAs quantum well using optical two-dimensional coherent spectroscopy. The collection of zero-quantum, one-quantum, and two-quantum two-dimensional spectra provides a unique and comprehensive picture of the double well coherent optical response. Coherent and incoherent contributions to the coupling between the two quantum well excitons are clearly separated. An excellent agreement with density matrix calculations reveals that coherent interwell coupling originates from many-body interactions.

Published
2013
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57. Correlation and dephasing effects on the non-radiative coherence between bright excitons in an InAs QD ensemble measured with 2D spectroscopy

Author

Moody, Galan, Singh, Rohan, Li, Hebin, Akimov, Ilya A., Bayer, Manfred, Reuter, Dirk, Wieck, Andreas D., and Cundiff, Steven T.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Exchange-mediated fine-structure splitting of bright excitons in an ensemble of InAs quantum dots is studied using optical two-dimensional Fourier-transform spectroscopy. By monitoring the non-radiative coherence between the bright states, we find that the fine-structure splitting decreases with increasing exciton emission energy at a rate of 0.1 $\mu$eV/meV. Dephasing rates are compared to population decay rates to reveal that pure dephasing causes the exciton optical coherences to decay faster than the radiative limit at low temperature, independent of excitation density. Fluctuations of the bright state transition energies are nearly perfectly-correlated, protecting the non-radiative coherence from interband dephasing mechanisms.

Published
2012
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58. Evidence for moire excitons in van der Waals heterostructures

Author

Tran, Kha, Moody, Galan, Wu, Fengcheng, Lu, Xiaobo, Choi, Junho, Kim, Kyounghwan, and Rai, Amritesh

Subjects
Semiconductors (Materials) -- Research, Excitons -- Research, Materials research, Superconductors, Molybdenum, Atoms, Aircraft, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Recent advances in the isolation and stacking of monolayers of van der Waals materials have provided approaches for the preparation of quantum materials in the ultimate two-dimensional limit.sup.1,2. In van der Waals heterostructures formed by stacking two monolayer semiconductors, lattice mismatch or rotational misalignment introduces an in-plane moiré superlattice.sup.3. It is widely recognized that the moiré superlattice can modulate the electronic band structure of the material and lead to transport properties such as unconventional superconductivity.sup.4 and insulating behaviour driven by correlations.sup.5-7; however, the influence of the moiré superlattice on optical properties has not been investigated experimentally. Here we report the observation of multiple interlayer exciton resonances with either positive or negative circularly polarized emission in a molybdenum diselenide/tungsten diselenide (MoSe.sub.2/WSe.sub.2) heterobilayer with a small twist angle. We attribute these resonances to excitonic ground and excited states confined within the moiré potential. This interpretation is supported by recombination dynamics and by the dependence of these interlayer exciton resonances on twist angle and temperature. These results suggest the feasibility of engineering artificial excitonic crystals using van der Waals heterostructures for nanophotonics and quantum information applications. Multiple interlayer exciton resonances in a MoSe.sub.2/WSe.sub.2 heterobilayer with a small twist angle are attributed to excitonic ground and excited states confined within the moiré potential., Author(s): Kha Tran [sup.1] , Galan Moody [sup.2] , Fengcheng Wu [sup.3] , Xiaobo Lu [sup.4] , Junho Choi [sup.1] , Kyounghwan Kim [sup.5] , Amritesh Rai [sup.5] , Daniel [...]

Published
2019
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65. Vibrational Interferometry Enables Single-Scan Acquisition of all χ(3) Multi-Dimensional Coherent Spectra

Author

Travis M. Autry, Moody Galan, McDonald Corry, James M. Fraser, Richard P. Mirin, and Kevin L. Silverman

Subjects
Physics, QC1-999
Abstract

We demonstrate a new method for multidimensional coherent spectroscopy of nanostructures. We use a heterodyne technique implemented with a confocal microscope to record the amplitude and phase of all degenerate third-order wave-mixing processes.

Published
2019
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66. Purcell enhancement and polarization control of single-photon emitters in monolayer WSe2 using dielectric nanoantennas.

Author

Azzam, Shaimaa I., Parto, Kamyar, and Moody, Galan

Subjects
OPTICAL antennas, DIELECTRICS, OPTICAL control, OPTICAL properties, ROBUST control
Abstract

Two-dimensional (2D) materials have shown great promise as hosts for high-purity deterministic single-photon sources. In the last few years, the underlying physics of single photon emission in 2D materials have been uncovered, and their optical properties have been improved to meet criteria for a variety of quantum technologies and applications. In this work, we take advantage of the unique characteristics of dielectric nanoantennas in manipulating the electromagnetic response on a sub-wavelength scale to localize and control defect-based single-photon emitters (SPEs) in 2D layered materials. We show that dielectric nanoantennas are capable of inducing high Purcell enhancement >20 and therefore brighter single-photon emission, which is characterized by a reduction of the emitters' radiative lifetimes and enhancement of their brightness by more than an order of magnitude. We demonstrate that the sub-wavelength-scale dielectric nanoantennas can be designed to also impose a predetermined strain profile that determines the confinement potential of the SPE, leading to robust control over the optical polarization with up to 94% extinction ratio. The combination of large Purcell enhancement, polarization orientation, and site control through strain engineering demonstrates the advantages and unique capabilities of dielectric nanoantennas for enhancing the quantum optical properties of 2D SPEs for quantum information technologies. [ABSTRACT FROM AUTHOR]

Published
2023
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71. 2022 Roadmap on integrated quantum photonics

Author

Moody, Galan, primary, Sorger, Volker J, additional, Blumenthal, Daniel J, additional, Juodawlkis, Paul W, additional, Loh, William, additional, Sorace-Agaskar, Cheryl, additional, Jones, Alex E, additional, Balram, Krishna C, additional, Matthews, Jonathan C F, additional, Laing, Anthony, additional, Davanco, Marcelo, additional, Chang, Lin, additional, Bowers, John E, additional, Quack, Niels, additional, Galland, Christophe, additional, Aharonovich, Igor, additional, Wolff, Martin A, additional, Schuck, Carsten, additional, Sinclair, Neil, additional, Lončar, Marko, additional, Komljenovic, Tin, additional, Weld, David, additional, Mookherjea, Shayan, additional, Buckley, Sonia, additional, Radulaski, Marina, additional, Reitzenstein, Stephan, additional, Pingault, Benjamin, additional, Machielse, Bartholomeus, additional, Mukhopadhyay, Debsuvra, additional, Akimov, Alexey, additional, Zheltikov, Aleksei, additional, Agarwal, Girish S, additional, Srinivasan, Kartik, additional, Lu, Juanjuan, additional, Tang, Hong X, additional, Jiang, Wentao, additional, McKenna, Timothy P, additional, Safavi-Naeini, Amir H, additional, Steinhauer, Stephan, additional, Elshaari, Ali W, additional, Zwiller, Val, additional, Davids, Paul S, additional, Martinez, Nicholas, additional, Gehl, Michael, additional, Chiaverini, John, additional, Mehta, Karan K, additional, Romero, Jacquiline, additional, Lingaraju, Navin B, additional, Weiner, Andrew M, additional, Peace, Daniel, additional, Cernansky, Robert, additional, Lobino, Mirko, additional, Diamanti, Eleni, additional, Vidarte, Luis Trigo, additional, and Camacho, Ryan M, additional

Published
2022
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77. Purcell enhancement and polarization control of single-photon emitters in monolayer WSe2using dielectric nanoantennas

Author

Azzam, Shaimaa I., Parto, Kamyar, and Moody, Galan

Abstract

Two-dimensional (2D) materials have shown great promise as hosts for high-purity deterministic single-photon sources. In the last few years, the underlying physics of single photon emission in 2D materials have been uncovered, and their optical properties have been improved to meet criteria for a variety of quantum technologies and applications. In this work, we take advantage of the unique characteristics of dielectric nanoantennas in manipulating the electromagnetic response on a sub-wavelength scale to localize and control defect-based single-photon emitters (SPEs) in 2D layered materials. We show that dielectric nanoantennas are capable of inducing high Purcell enhancement >20 and therefore brighter single-photon emission, which is characterized by a reduction of the emitters’ radiative lifetimes and enhancement of their brightness by more than an order of magnitude. We demonstrate that the sub-wavelength-scale dielectric nanoantennas can be designed to also impose a predetermined strain profile that determines the confinement potential of the SPE, leading to robust control over the optical polarization with up to 94% extinction ratio. The combination of large Purcell enhancement, polarization orientation, and site control through strain engineering demonstrates the advantages and unique capabilities of dielectric nanoantennas for enhancing the quantum optical properties of 2D SPEs for quantum information technologies.

Published
2022
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79. Phonon Dephasing Dynamics in MoS2

Author

Sun, Liuyang, primary, Kumar, Parveen, additional, Liu, Zeyu, additional, Choi, Junho, additional, Fang, Bin, additional, Roesch, Sebastian, additional, Tran, Kha, additional, Casara, Joshua, additional, Priego, Eduardo, additional, Chang, Yu-Ming, additional, Moody, Galan, additional, Silverman, Kevin L., additional, Lorenz, Virginia O., additional, Scheibner, Michael, additional, Luo, Tengfei, additional, and Li, Xiaoqin, additional

Published
2021
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80. Twist Angle-Dependent Interlayer Exciton Lifetimes in van der Waals Heterostructures

Author

Choi, Junho, primary, Florian, Matthias, additional, Steinhoff, Alexander, additional, Erben, Daniel, additional, Tran, Kha, additional, Kim, Dong Seob, additional, Sun, Liuyang, additional, Quan, Jiamin, additional, Claassen, Robert, additional, Majumder, Somak, additional, Hollingsworth, Jennifer A., additional, Taniguchi, Takashi, additional, Watanabe, Kenji, additional, Ueno, Keiji, additional, Singh, Akshay, additional, Moody, Galan, additional, Jahnke, Frank, additional, and Li, Xiaoqin, additional

Published
2021
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86. Optimization of photoluminescence from W centers in silicon-on-insulator

Author

Buckley, Sonia M., primary, Tait, Alexander N., additional, Moody, Galan, additional, Primavera, Bryce, additional, Olson, Stephen, additional, Herman, Joshua, additional, Silverman, Kevin L., additional, Papa Rao, Satyavolu, additional, Woo Nam, Sae, additional, Mirin, Richard P., additional, and Shainline, Jeffrey M., additional

Published
2020
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90. 3938159.pdf

Author

Autry, Travis, Moody, Galan, Fraser, James, McDonald, Corey, Mirin, Richard, and Silverman, Kevin

Abstract

Supplemental Document

Published
2019
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92. Optical Multidimensional Spectroscopy of Atomic Vapor

Author

Siemens Mark E., Moody Galan, Bristow Alan D., Li Hebin, and Cundiff Steven T.

Subjects
Physics, QC1-999
Abstract

Optical single- and double-quantum three-dimensional Fourier-transform spectra are obtained for atomic vapors. We show that three-dimensional spectra can be used to identify the Hamiltonian of complex systems and to reveal the nature of many-body interactions.

Published
2013
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93. Multi-dimensional coherent optical spectroscopy of semiconductor nanostructures: Collinear and non-collinear approaches.

Author

Nardin, Gaël, Autry, Travis M., Moody, Galan, Singh, Rohan, Hebin Li, and Cundiff, Steven T.

Subjects
OPTICAL spectroscopy, SEMICONDUCTOR nanoparticles, NANOSTRUCTURES, GEOMETRY, QUANTUM dots
Abstract

We review our recent work on multi-dimensional coherent optical spectroscopy (MDCS) of semiconductor nanostructures. Two approaches, appropriate for the study of semiconductor materials, are presented and compared. A first method is based on a non-collinear geometry, where the Four-Wave-Mixing (FWM) signal is detected in the form of a radiated optical field. This approach works for samples with translational symmetry, such as Quantum Wells (QWs) or large and dense ensembles of Quantum Dots (QDs). A second method detects the FWM in the form of a photocurrent in a collinear geometry. This second approach extends the horizon of MDCS to sub-diffraction nanostructures, such as single QDs, nanowires, or nanotubes, and small ensembles thereof. Examples of experimental results obtained on semiconductor QW structures are given for each method. In particular, it is shown how MDCS can assess coupling between excitons confined in separated QWs. [ABSTRACT FROM AUTHOR]

Published
2015
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94. Delayed formation of coherence in the emission dynamics of high-Q nanolasers

Author

Moody, Galan, Segnon, Mawussey, Sagnes, Isabelle, Braive, Rémy, Beveratos, Alexios, PHILIP, Isabelle, Belabas, Nadia, Jahnke, Frank, Silverman, Kevin l., Mirin, Richard p., Stevens, Martin J., Gies, Christopher, National Institute of Standards and Technology [Gaithersburg] (NIST), University of Bremen, Centre de Nanosciences et de Nanotechnologies [Marcoussis] (C2N), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Charles Coulomb (L2C), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Physics::Optics
Abstract

In the realization of ultrasmall semiconductor lasers, cavity-QED effects are used to enhance spontaneous emission and enable the lasing threshold to be crossed with gain contributions from only a few solid-state emitters. Operation in this regime fosters correlation effects that leave their fingerprint especially in the emission dynamics of nanolasers. Using time-resolved photon-correlation spectroscopy, we show that in a quantum-dot photonic-crystal nanolaser emitting in the telecom band, second-order coherence associated with lasing is established on a different timescale than the emission itself. By combining measurements with a microscopic semiconductor laser theory, we attribute the origin to carrier-photon correlations that give rise to non-Markovian effects in the emission dynamics that are not captured by laser rate-equation theories. Our results have direct implications with respect to the modulation response, repetition rate, noise characteristics, and coherence properties of nanolasers for device applications.

Published
2018

95. 3281405.pdf

Author

Moody, Galan, Segnon, Mawussey, SAGNES, ISABELLE, BRAIVE, Rémy, Beveratos, Alexios, Robert-Philip, Isabelle, Belabas, Nadia, Jahnke, Frank, Silverman, Kevin, and Mirin, Richard

Abstract

Supplemental Material

Published
2018
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96. Multifunctional integrated photonics in the mid-infrared with suspended AlGaAs on silicon

Author

Chiles, Jeff, primary, Nader, Nima, additional, Stanton, Eric J., additional, Herman, Daniel, additional, Moody, Galan, additional, Zhu, Jiangang, additional, Connor Skehan, J., additional, Guha, Biswarup, additional, Kowligy, Abijith, additional, Gopinath, Juliet T., additional, Srinivasan, Kartik, additional, Diddams, Scott A., additional, Coddington, Ian, additional, Newbury, Nathan R., additional, Shainline, Jeffrey M., additional, Nam, Sae Woo, additional, and Mirin, Richard P., additional

Published
2019
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