Article
Nanoscience & Nanotechnology
Ibrahim Issah, Mohsin Habib, Humeyra Caglayan
Summary: The study presents a rolled-up zero-index waveguide as a unique reservoir for long-range qubit-qubit entanglement, with numerical evaluation and experimental validation demonstrating its potential in quantum technological applications.
Article
Optics
V. B. Novikov, T. V. Murzina
Summary: Optical vortices with donut shapes, known as spatiotemporal optical vortices (STOV) pulses, have attracted much attention in photonics due to their promising applications. In this study, STOV pulses were generated by transmitting femtosecond pulses through a thin epsilon-near-zero (ENZ) metamaterial slab containing a silver nanorod array. The interference of main and additional optical waves in these ENZ metamaterials, enabled by their strong optical nonlocality, led to the appearance of phase singularities in the transmission spectra. A cascaded metamaterial structure was proposed for high-order STOV generation.
Article
Chemistry, Multidisciplinary
Patrick Sohr, Dongxia Wei, Zhengtianye Wang, Stephanie Law
Summary: This paper experimentally demonstrates strong coupling between VPP modes in a semiconductor HMM and intersubband transitions of epitaxially embedded quantum wells, leading to clear anticrossings in the dispersion curves of different-order VPP modes, laying the foundation for the creation of novel infrared optoelectronic structures combining HMMs with embedded epitaxial emitter or detector structures.
Article
Physics, Multidisciplinary
Li Yuan-He, Zhuo Zhi-Yao, Wang Jian, Huang Jun-Hui, Li Shu-Lun, Ni Hai-Qiao, Niu Zhi-Chuan, Dou Xiu-Ming, Sun Bao-Quan
Summary: Quantum dots (QDs) as ideal single-photon sources play a unique role in quantum information. By controlling the spontaneous emission rate of QD excitons through anti-phase coupling with Au nanoparticles, the emission of photons can be enhanced and modulated. Experimental results show that the spontaneous emission rate of excitons is suppressed when the distance between the QDs and Au nanoparticles is 15-35 nm. When the distance is close to 19 nm, the spontaneous emission rate decreases to , which is consistent with theoretical calculations. The long-lived exciton emission observed in the experiment is attributed to the scattering of exciton radiation by Au nanoparticles in the QD wetting layer, where the phase of the scattered field is opposite to that of the exciton radiation field, resulting in destructive interference.
ACTA PHYSICA SINICA
(2022)
Article
Nanoscience & Nanotechnology
Leonarde N. Rodrigues, Diego Scolfaro, Lucas da Conceicao, Angelo Malachias, Odilon D. D. Couto, Fernando Iikawa, Christoph Deneke
Summary: Strain-based band structure engineering is shown to be an effective tool for tuning the optical and electronic properties of semiconductor nanostructures. By integrating InGaAs quantum wells into rolled-up heterostructures and changing their geometrical configuration, the band structure is tunable and the emitted light can have modified helicity. Experimental results demonstrate significant energy shifts and inversions of band states in rolled-up structures compared to flat structures, leading to changes in the optical selection rules and vanishing spin polarization. Comparisons between experiment and theory show excellent agreement, suggesting potential applications in developing novel optical devices for quantum information technology.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Ja-Hon Lin, Gung-Rong Chen, Sheng-Jie Li, Yu-Feng Song, Wei-Rein Liu
Summary: This study investigates the polarization characteristics of amplified spontaneous emissions (ASEs) from ZnO/Zn0.8Mg0.2O multiple quantum wells (MQWs) and finds linear polarization under pulsed light excitation. The findings have practical significance for the application of microcavity lasers in metrology and biomedical imaging.
Article
Chemistry, Multidisciplinary
Yeonghoon Jin, Youngjae Jeong, Kyoungsik Yu
Summary: Passive multilayer coatings for windows can improve energy consumption for indoor temperature regulation by blocking solar IR energy and maintaining visible light transparency, as well as efficiently radiating thermal energy to lower the interior temperature.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Optics
Zhiyuan Qian, Lingxiao Shan, Xinchen Zhang, Qi Liu, Yun Ma, Qihuang Gong, Ying Gu
Summary: This review focuses on the principle of enhanced spontaneous emission in micro- or nanoscale single-photon sources based on cavity quantum electrodynamics (CQED), discussing various structures such as whispering gallery microcavities, photonic crystals, plasmon nanostructures, metamaterials, and their hybrids. These studies have enriched the understanding of light-matter interaction, greatly impacting the development of single-photon sources, photonic circuits, and on-chip quantum information technologies.
Article
Optics
Aaron J. Muhowski, Evan Simmons, Kun Li, Evgenii E. Narimanov, Viktor A. Podolskiy, Daniel Wasserman
Summary: This work explores the possibility of extending the plasmonic response of doped semiconductors to the short-wavelength side of the mid-infrared by leveraging charge confinement. The existence of negative permittivity across the technologically vital midwave infrared range is demonstrated both theoretically and experimentally. The semiconductor composites presented in this study provide an ideal material platform for monolithic integration with a variety of semiconductor optoelectronic devices operating in the mid-wave infrared.
Article
Materials Science, Multidisciplinary
Paul Goulain, Chris Deimert, Mathieu Jeannin, Stefano Pirotta, Wojciech Julian Pasek, Zbigniew Wasilewski, Raffaele Colombelli, Jean-Michel Manceau
Summary: Continuously graded parabolic quantum wells are used to overcome the limitations of square quantum wells at terahertz frequencies. Microcavity intersubband polaritons are formed at frequencies as low as 1.8 THz, with ultra-strong coupling sustained up to 200 K. The use of sub-wavelength resonators preserves the ultra-strong coupling regime, making it a potential approach for generating non-classical light.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yiyun Zhang, Dominic Lepage, Yiming Feng, Sihan Zhao, Hongsheng Chen, Haoliang Qian
Summary: Tunnel nanojunctions based on inelastic electron tunneling (IET) have been proposed as breakthroughs for ultra-fast integrated light sources, but the weak photon-emission power and limited efficiency due to elastic tunneling have hindered their practical applications. Resonant tunneling has been suggested as a solution, but the contradiction between high photon-emission efficiency and power has remained unsatisfactory. This work introduces a novel approach using multiple metallic quantum wells to achieve stronger resonant tunneling enhancement, enabling the internal quantum efficiency to reach approximately 1 and photon-emission power to reach approximately 0.8 μW/μm², bringing practical implementation of IET-based sources one step closer to reality.
Article
Quantum Science & Technology
Hamidreza Siampour, Christopher O'Rourke, Alistair J. Brash, Maxim N. Makhonin, Rene Dost, Dominic J. Hallett, Edmund Clarke, Pallavi K. Patil, Maurice S. Skolnick, A. Mark Fox
Summary: Quantum states of light and matter can be manipulated on the nanoscale to aid the implementation of scalable photonic quantum technologies. A nanophotonic waveguide platform with embedded quantum dots (QDs) was demonstrated, allowing for Purcell-enhanced emission and strong chiral coupling. Record-large radiative decay rate and Purcell enhancement were achieved through electric-field tuning and quasi-resonant excitation. The results show promising prospects for using QDs in scalable implementations of on-chip spin-photonics relying on chiral quantum optics.
NPJ QUANTUM INFORMATION
(2023)
Article
Astronomy & Astrophysics
Igor I. Smolyaninov, Vera N. Smolyaninova
Summary: This study demonstrates the similarity between sound waves and gravitational waves in hyperbolic metamaterials, as well as the similarity between phonons and gravitons. Near phase transitions in these metamaterials, quantum gravity effects can be switched on or off. Additionally, it is predicted that there will be a strong enhancement of sonoluminescence in ferrofluid-based hyperbolic metamaterials, resembling particle creation in strong gravitational fields.
Article
Physics, Multidisciplinary
Carlos Ariel Gil-Barrera, Raymundo Santana Carrillo, Guo-Hua Sun, Shi-Hai Dong
Summary: This study examines the quantum information entropies for two different types of hyperbolic single potential wells, revealing that the momentum entropy densities of the wells change with their width and the position entropy density decreases as momentum entropy magnitude increases. Additionally, the variation of position and momentum entropies with potential well depth is investigated, confirming that their sum still satisfies the BBM inequality relation.
Review
Nanoscience & Nanotechnology
Gabriel Gomes, Marcos L. F. Gomes, Saimon F. Covre da Silva, Ailton Garcia Jr, Armando Rastelli, Odilon D. D. Couto Jr, Angelo Malachias, Christoph Deneke
Summary: This review discusses the influence of the inherently asymmetric strain state of rolled-up III-V heterostructure tubes on light emitters. Whispering gallery mode resonators built from rolled-up III-V heterostructures are briefly reviewed. The curvature and its influence on the diameter of the rolled-up micro- and nanotubes are discussed, as well as the possible strain states. Experimental techniques are essential to accurately determine the strain state for the emitters inside the tube wall.
Article
Materials Science, Multidisciplinary
Johannes Holler, Lorenz Bauriedl, Tobias Korn, Andrea Seitz, Furkan Oezyigit, Michaela Eichinger, Christian Schueller, Kenji Watanabe, Takashi Taniguchi, Christoph Strunk, Nicola Paradiso
Article
Physics, Applied
Johannes Holler, Sebastian Meier, Michael Kempf, Philipp Nagler, Kenji Watanabe, Takashi Taniguchi, Tobias Korn, Christian Schueller
APPLIED PHYSICS LETTERS
(2020)
Article
Materials Science, Multidisciplinary
Philipp Parzefall, Johannes Holler, Marten Scheuck, Andreas Beer, Kai-Qiang Lin, Bo Peng, Bartomeu Monserrat, Philipp Nagler, Michael Kempf, Tobias Korn, Christian Schueller
Summary: The study investigated twisted MoSe2 homo- and MoSe2-WSe2 heterobilayers using low-frequency Raman spectroscopy and low-temperature micro photoluminescence, revealing moiré phonons and their relationship to twist angles. By analyzing the moiré phonons in heterobilayers, relative twist angles can be determined with higher precision, and the correlation between interlayer-exciton signals and twist angles was discussed.
Article
Chemistry, Multidisciplinary
Jonas E. Zimmermann, Marleen Axt, Fabian Mooshammer, Philipp Nagler, Christian Schueller, Tobias Korn, Ulrich Hoefer, Gerson Mette
Summary: Two-dimensional transition metal dichalcogenides provide an intriguing platform for creating van der Waals heterojunctions with unique physical properties. Photoexcited electrons and holes can separate through interfacial charge transfer due to their type-II band alignment. The dynamics of ultrafast charge transfer in these heterostructures, influenced by stacking angle, suggest that radiative recombination becomes the dominant decay route.
Article
Instruments & Instrumentation
M. Kempf, A. Schubert, R. Schwartz, T. Korn
Summary: The two-color Kerr microscopy system presented in this study, based on two electronically synchronized erbium-fiber laser oscillators with independently tunable emission energies, offers high spatial resolution, sub-ps time resolution, and high sensitivity for studying spin and valley dynamics in a wide range of two-dimensional materials. The system's capabilities are demonstrated through the study of a monolayer of MoS2.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Chemistry, Multidisciplinary
Tim Voelzer, Alina Schubert, Erik von der Oelsnitz, Julian Schroeer, Ingo Barke, Rico Schwartz, Kenji Watanabe, Takashi Taniguchi, Sylvia Speller, Tobias Korn, Stefan Lochbrunner
Summary: This study investigates the charge or energy transfer-related quenching of perylene orange (PO) dye fluorescence when brought onto monolayer TMDCs via thermal vapor deposition. The results show a significant intensity drop in PO fluorescence and a relative growth of trion versus exciton contribution in TMDC emission. Fluorescence imaging lifetime microscopy confirms the intensity quenching to be around 10^3-fold and a drastic reduction in lifetime. Analysis suggests a time constant of several picoseconds at most, indicating efficient charge separation suitable for optoelectronic devices.
NANOSCALE ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Tim Voelzer, Franziska Fennel, Tobias Korn, Stefan Lochbrunner
Summary: Transition-metal dichalcogenides have a layered lattice structure that facilitates the fabrication of two-dimensional crystals. Monolayers exhibit direct band gaps and higher exciton binding energies compared to bulk materials. Excited populations decay over time, with different mechanisms observed for monolayer and bulk samples.
Article
Materials Science, Multidisciplinary
S. Gelfert, C. Frankerl, C. Reichl, D. Schuh, G. Salis, W. Wegscheider, D. Bougeard, T. Korn, C. Schueller
Proceedings Paper
Chemistry, Physical
Christoph P. Schmid, Fabian Langer, Stefan Schlauderer, Martin Gmitra, Jaroslav Fabian, Philipp Nagler, Christian Schueller, Tobias Korn, Peter G. Hawkins, Johannes T. Steiner, Ulrich Huttner, Stephan W. Koch, Mackillo Kira, Rupert Huber
XXI INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA 2018 (UP 2018)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
C. P. Schmid, S. Schlauderer, F. Langer, M. Gmitra, J. Fabian, P. Nagler, C. Schueller, T. Korn, P. G. Hawkins, J. T. Steiner, U. Huttner, M. Borsch, B. Girodias, S. W. Koch, M. Kira, R. Huber
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Philipp Steinleitner, Philipp Merkl, Philipp Nagler, Christian Schueller, Tobias Korn, Samuel Brem, Malte Selig, Gunnar Berghaeuser, Ermin Malic, Rupert Huber
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Philipp Merkl, Fabian Mooshammer, Philipp Steinleitner, Anna Girnghuber, Kai-Qiang Lin, Philipp Nagler, Johannes Holler, Christian Schueller, John M. Lupton, Tobias Korn, Simon Ovesen, Samuel Brem, Ermin Malic, Rupert Huber
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
Proceedings Paper
Nanoscience & Nanotechnology
F. Langer, C. P. Schmid, S. Schlauderer, P. Nagler, C. Schueller, T. Korn, M. Gmitra, J. Fabian, P. G. Hawkins, U. Huttner, J. T. Steiner, S. W. Koch, M. Kira, R. Huber
12TH INTERNATIONAL CONFERENCE ON EXCITONIC AND PHOTONIC PROCESSES IN CONDENSED MATTER AND NANO MATERIALS (EXCON 2018)
(2019)
Article
Physics, Multidisciplinary
Simon Ovesen, Samuel Brem, Christopher Linderalv, Mikael Kuisma, Tobias Korn, Paul Erhart, Malte Selig, Ermin Malic
COMMUNICATIONS PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Tobias Voelkl, Denis Kochan, Thomas Ebnet, Sebastian Ringer, Daniel Schiermeier, Philipp Nagler, Tobias Korn, Christian Schueller, Jaroslav Fabian, Dieter Weiss, Jonathan Eroms
