Article
Nanoscience & Nanotechnology
Yifei Xu, Qi Song, Enen Li, Min Zhang, Zhenhua Sun, Tianwu Wang, Fang Liu, Peiguang Yan
Summary: An optical controlled THz modulator is proposed in this study, combining lead sulfide (PbS) quantum dots with subwavelength metallic split-ring resonators (SRRs) to provide field enhancement. The modulation depth reaches 60.3%, which is approximately 3 times larger than the PbS quantum dots film without SRRs (as reference) in the frequency range of 0.1-1.1 THz. The significant enhanced THz modulation is mainly attributed to the local THz field enhancement caused by the SRRs, consistent with the simulation result.
Article
Physics, Multidisciplinary
Chuyao Tong, Annika Kurzmann, Rebekka Garreis, Wei Wister Huang, Samuel Jele, Marius Eich, Lev Ginzburg, Christopher Mittag, Kenji Watanabe, Takashi Taniguchi, Klaus Ensslin, Thomas Ihn
Summary: The study reports experiments on coupled bilayer graphene double quantum dots, where the spin and valley states are precisely controlled, enabling the observation of two-electron combined blockade physics. The switching of selection rules is demonstrated by switching between different ground states with gate and magnetic-field tuning, showing either valley blockade or spin blockade depending on the ground state configuration.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jakob Rieser, Mario A. Ciampini, Henning Rudolph, Nikolai Kiesel, Klaus Hornberger, Benjamin A. Stickler, Markus Aspelmeyer, Uros Delic
Summary: Arrays of optically trapped nanoparticles have been used to study complex nonequilibrium phenomena. However, the ability to precisely control the interactions between particles has been limited. In this study, the researchers coupled two nanoparticles using the phase coherence between the optical fields that drive the light-induced dipole-dipole interaction. They also observed electrostatic coupling between charged particles by effectively switching off the optical interaction. These findings provide a route to developing programmable many-body systems of interacting nanoparticles with tunable nonreciprocal interactions.
Article
Chemistry, Multidisciplinary
Bin Leong Ong, Muhammad Avicenna Naradipa, Angga Dito Fauzi, Muhammad Aziz Majidi, Caozheng Diao, Satoshi Kurumi, Pranab Kumar Das, Chi Xiao, Ping Yang, Mark B. H. Breese, Sheau Wei Ong, Khay Ming Tan, Eng Soon Tok, Andrivo Rusydi
Summary: A new concept of spin correlated-plasmon has been proposed and demonstrated in highly oriented single-crystalline gold quantum-dots at room temperature, with tunable properties from infrared to visible light, as well as high sensitivity for surface-enhanced Raman spectroscopy applications.
Article
Chemistry, Physical
Mattia Salomone, Michele Re Fiorentin, Giancarlo Cicero, Francesca Risplendi
Summary: The study analyzes the stability and electronic properties of an InSe monolayer with point defects, showing the presence of deep defect states within the band gap. It predicts that Ge as a substitution impurity of Se could be a promising material for single-photon emitters due to its optical properties and strongly peaked spectrum in the near-infrared.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Ron Ruimy, Alexey Gorlach, Gefen Baranes, Ido Kaminer
Summary: We investigate the interaction between a free electron and a group of identical optical emitters. The coherence and correlations among the emitters can strengthen the interaction with each electron and affect its energy spectrum. We propose methods to achieve such collective interactions. As an application, we study the interaction between free electrons and superradiant systems, demonstrating how electrons can probe the ultrafast population dynamics of superradiance.
Article
Optics
Yilin Sun, Yingtao Ding, Dan Xie, Jianlong Xu, Mengxing Sun, Pengfei Yang, Yanfeng Zhang
Summary: An optically stimulated synaptic transistor based on MoS2/quantum dots mixed-dimensional heterostructure is reported, showing non-linear response to optical stimuli and adjustable optical synaptic plasticity. This device exhibits high paired-pulse facilitation and gate-tunability in long-term plasticity modulation.
Article
Nanoscience & Nanotechnology
Leon Zaporski, Noah Shofer, Jonathan H. Bodey, Santanu Manna, George Gillard, Martin Hayhurst Appel, Christian Schimpf, Saimon Filipe Covre da Silva, John Jarman, Geoffroy Delamare, Gunhee Park, Urs Haeusler, Evgeny A. Chekhovich, Armando Rastelli, Dorian A. Gangloff, Mete Atature, Claire Le Gall
Summary: Combining highly coherent spin control with efficient light-matter coupling, this study demonstrates the ability to decouple electron spin qubits in optically active semiconductor quantum dots beyond 0.113(3) ms, overcoming the limitations imposed by nuclear inhomogeneity. The findings show a promising solution to the material science challenge and establish the basis for highly coherent spin-photon interfaces.
NATURE NANOTECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Ranjan Kumar Behera, Leepsa Mishra, Aradhana Panigrahi, Prasana Kumar Sahoo, Manas Kumar Sarangi
Summary: Transition metal dichalcogenide based quantum dots have unique tunable photophysics and are considered as next-generation quantum materials for technology-based semiconductor applications. This article discusses the controlled synthesis of MoS2 and WS2 quantum dots and their distinctive structural, optical, and electrical characteristics. The photophysics and charge transfer kinetics between the quantum dots and a redox-active biomolecule are studied, highlighting the potential applications in advanced optoelectronic devices and future quantum technology.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Steven J. Neuhaus, Emanuele Marino, Christopher B. Murray, Cherie R. . Kagan
Summary: Self-assembled superparticles composed of colloidal quantum dots are used to create microsphere cavities that support optically pumped lasing from whispering gallery modes. The lasing properties of CdSe/CdS quantum dot superparticles are found to be dependent on the excitation fluence and time, with blue-shifts occurring over a 15-minute period. A high-fluence light soaking protocol is established to counter this effect, resulting in reduced blue-shifts and enabling color-tunable lasing from red to green. This study suggests that quantum dot superparticles have the potential to be low-cost, robust, solution-processable, and tunable microlasers.
Article
Chemistry, Multidisciplinary
Ilker Torun, Conan Huang, Mustafa Kalay, Moonsub Shim, M. Serdar Onses
Summary: This article introduces the pH tunable assembly of quantum dots (QDs) over functional patterns prepared by electrohydrodynamic jet printing of poly(2-vinylpyridine). The pH of the dispersion provides tunability at two levels, allowing for modulation of QDs adsorption density and fluorescence. The selective adsorption of QDs enables both deterministic patterning and hierarchically structured encoding of information. Through image analysis and feature matching algorithms, it is demonstrated that these patterns are unclonable and suitable for anti-counterfeiting applications.
Article
Chemistry, Physical
Chiara Biz, Mauro Fianchini, Jose Gracia
Summary: Understanding quantum correlations within catalysts is crucial for describing electronic factors in catalysis. Quantum spin exchange interactions play a significant role in stabilizing orbital configurations in magnetic materials, affecting catalytic properties. The dominance of interatomic ferromagnetic interactions generally increases reaction kinetics, while antiferromagnetic interactions tend to decrease them. Quantum excitation interactions are also important for establishing band gaps and mediating electron transfer reactions.
Article
Physics, Multidisciplinary
Vidhi Shingla, Haoyun Huang, Ashwani Kumar, Loren N. Pfeiffer, Kenneth W. West, Kirk W. Baldwin, Gabor A. Csathy
Summary: Composite fermions can form bubbles that order into a lattice. The re-entrance of the fractional quantum Hall effect is associated with a bubble phase with two composite fermion quasiparticles per bubble. This observation demonstrates the existence of a new class of strongly correlated topological phases driven by clustering and charge ordering of emergent quasiparticles.
Article
Chemistry, Organic
Shixian Cao, Pan Wang, Xi Zeng, Zhu Tao, Xin-Long Ni
Summary: The study utilized the cucurbituril host-guest chemistry to assist in the formation of carbon dots with tunable particle size and high fluorescence emission. By retaining the original rigid macrocyclic skeletons of the hosts during the fabrication process, the CDs obtained were characterized by high quality and unique properties, offering potential applications in biosensors and other fields.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Chuyao Tong, Rebekka Garreis, Angelika Knothe, Marius Eich, Agnese Sacchi, Kenji Watanabe, Takashi Taniguchi, Vladimir Fal'ko, Thomas Ihn, Klaus Ensslin, Annika Kurzmann
Summary: Quantum states in graphene have two-fold degeneracy in spins and valleys, which can be utilized for qubit preparations. In bilayer graphene quantum dots, the valley g-factor can be tuned by gate voltage adjustments, resulting in larger g-factor with larger electronic dot sizes. Bipolar operation on the versatile device allows for the observation of transitions from electron dots to hole dots. Addition of gates can extend the system to host tunable double dots.
Article
Physics, Applied
Joonho Jang, Heun Mo Yoo, L. N. Pfeiffer, K. W. West, K. W. Baldwin, Raymond C. Ashoori
Summary: The design of electrically isolated floating bilayer GaAs quantum wells allows controllable induction of charges trapped in the bilayer. The thick insulating barriers fully isolate the bilayer from external electrodes, providing control over the densities of two coupled 2D electron systems. This design offers a unique approach for studying inaccessible systems and enables measurement of charge transfer between layers.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Camille Lagoin, Stephan Suffit, Kirk Baldwin, Loren Pfeiffer, Francois Dubin
Summary: In this research, the existence of a Mott phase was observed by exploring the Bose-Hubbard model with semiconductor excitons confined in a two-dimensional lattice. This provides a potential pathway for studying many-body phases that break lattice symmetry.
Article
Physics, Multidisciplinary
Bosong Sun, Wenjin Zhao, Tauno Palomaki, Zaiyao Fei, Elliott Runburg, Paul Malinowski, Xiong Huang, John Cenker, Yong-Tao Cui, Jiun-Haw Chu, Xiaodong Xu, S. Samaneh Ataei, Daniele Varsano, Maurizia Palummo, Elisa Molinari, Massimo Rontani, David H. Cobden
Summary: Evidence shows that monolayer WTe2 contains excitons formed by electrons and holes bound by Coulomb attraction, exhibiting V-shaped dependence on electrostatic doping and step in chemical potential at the neutral point upon cooling. Strong electronic interactions allow excitons to form and condense at high temperature, showing strong correlations over a wide temperature range.
Article
Physics, Multidisciplinary
Yoon Jang Chung, D. Graf, L. W. Engel, K. A. Villegas Rosales, P. T. Madathil, K. W. Baldwin, K. W. West, L. N. Pfeiffer, M. Shayegan
Summary: This study investigates the ground state of two-dimensional electron systems (2DESs) at low Landau level filling factors using improved experimental methods. It confirms the existence of fractional quantum Hall states that comply with the Jain sequence even in the extremely low Landau level filling limit.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Ziyu Liu, Ursula Wurstbauer, Lingjie Du, Ken W. West, Loren N. Pfeiffer, Michael J. Manfra, Aron Pinczuk
Summary: This study investigates the impacts of domain textures on low-lying neutral excitations in bulk fractional quantum Hall effect (FQHE) systems using resonant inelastic light scattering. The research demonstrates that large domains of quantum fluids support long-wavelength neutral collective excitations with well-defined wave vector dispersion, which can be explained by theories for uniform phases. The accessibility of dispersive low-lying neutral collective modes, such as long wavelength magnetorotons at filling factor v = 1/3, in large domains of FQHE fluids offers significant experimental access to strong electron correlation physics in the FQHE.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
V Ardizzone, F. Riminucci, S. Zanotti, A. Gianfrate, M. Efthymiou-Tsironi, D. G. Suarez-Forero, F. Todisco, M. De Giorgi, D. Trypogeorgos, G. Gigli, K. Baldwin, L. Pfeiffer, D. Ballarini, H. S. Nguyen, D. Gerace, D. Sanvitto
Summary: This study discovered bound states in the continuum (BICs) in a planar photonic crystal lattice, which have a long lifetime and are not affected by radiation. The researchers also demonstrated non-equilibrium Bose-Einstein condensation occurring in the BIC. By combining bosonic condensation and symmetry-protected radiation eigenmodes, they showed a way to impart topological properties onto macroscopic quantum states.
Article
Multidisciplinary Sciences
Angela Montanaro, Francesca Giusti, Matteo Zanfrognini, Paola Di Pietro, Filippo Glerean, Giacomo Jarc, Enrico Maria Rigoni, Shahla Y. Mathengattil, Daniele Varsano, Massimo Rontani, Andrea Perucchi, Elisa Molinari, Daniele Fausti
Summary: The authors investigate the optical response of bulk black phosphorus to mid-infrared pulses, and find that while above-gap excitation leads to a broadband light-induced transparency, sub-gap pulses drive an anomalous response, peaked at the single-layer exciton resonance.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yoon Jang Chung, C. Wang, S. K. Singh, A. Gupta, K. W. Baldwin, K. W. West, M. Shayegan, L. N. Pfeiffer, R. Winkler
Summary: This paper reports the fabrication of ultra-high-quality (001) GaAs 2D hole systems with significantly improved mobility values. High-order fractional quantum Hall states and a deep minimum in the magnetoresistance were observed in the measurements.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Applied
C. Hnatovsky, M. A. Zudov, G. D. Austing, A. Bogan, S. J. Mihailov, M. Hilke, K. W. West, L. N. Pfeiffer, S. A. Studenikin
Summary: This paper proposes a non-destructive, all-optical technique to create embedded lateral superlattices near semiconductor heterostructures by illuminating the samples with a stable interference pattern. The technique is demonstrated on a GaAs/A1GaAs sample with Si delta-doping by inducing charge redistribution in the doping layer. The characteristics of the light-induced superlattice are obtained through the analysis of Weiss commensurability oscillations in the magnetoresistance.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Condensed Matter
Haoyun Huang, S. A. Myers, L. N. Pfeiffer, K. W. West, K. W. Baldwin, G. A. Csathy
Summary: This study reports on the large signal current-voltage characteristics measurements near the v = 1 integer quantum Hall plateau in a high mobility GaAs/AlGaAs sample. The research finds that both the Anderson insulator and integer quantum Hall Wigner solid exhibit a sharp onset of conduction at low temperatures and under large bias currents, with this onset depending monotonically on the filling factor across the boundary between the two localized phases. Surprisingly, these large signal characteristics do not clearly differentiate between the Anderson insulator and the integer quantum Hall Wigner solid.
SOLID STATE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Md Shafayat Hossain, Meng K. Ma, Y. J. Chung, S. K. Singh, A. Gupta, K. W. West, K. W. Baldwin, L. N. Pfeiffer, R. Winkler, M. Shayegan
Summary: This study demonstrates how the valley degree of freedom impacts the fractional quantum states (FQHSs) through magnetotransport experiments. The researchers find a surprisingly robust ferromagnetism of the FQHSs and the underlying composite fermions (CFs), suggesting a strong interaction between the CFs in the system.
Article
Materials Science, Multidisciplinary
Q. Yao, E. Sedov, S. Mukherjee, J. Beaumariage, B. Ozden, K. West, L. Pfeiffer, A. Kavokin, D. W. Snoke
Summary: This study presents observations of a nonequilibrium polariton condensate injected in a quasi-1D ring, revealing the existence of circular polarization precession and the influence of zitterbewegung behavior on the motion of polaritons.
Article
Materials Science, Multidisciplinary
Xinghao Wang, Peizhe Jia, Rui-Rui Du, L. N. Pfeiffer, K. W. Baldwin, K. W. West
Summary: This article systematically studies the behavior of viscous fluid in an ultrahigh-mobility two-dimensional electron gas (2DEG) in GaAs/AlGaAs quantum wells through measurements of negative magnetoresistance (NMR) and photoresistance under microwave radiation, and analyzes the data according to recent theoretical work. The results show that the size-dependent and temperature-dependent NMR conform to the theoretical predictions, and the size dependence of microwave induced resistance oscillations and the second harmonic peak indicate that 2DEG in a moderate magnetic field can also be regarded as viscous fluid. The size-dependent radiation heating effect is found by using NMR as electron thermometry. These findings suggest that the hydrodynamic effects must be considered in order to understand semiclassical electronic transport in a clean 2DEG.
Article
Materials Science, Multidisciplinary
Yoon Jang Chung, A. Gupta, K. W. Baldwin, K. W. West, M. Shayegan, L. N. Pfeiffer
Summary: Ultrahigh-mobility GaAs two-dimensional electron systems (2DESs) have been a significant platform for condensed-matter physics research for several decades. Continuous improvement in sample quality has enabled scattering-free transport and led to the emergence of exotic many-body phenomena. Recent research shows the potential for further increasing the mobility limit of GaAs 2DESs, and discusses scenarios for achieving mobility values exceeding 100 x 10(6) cm(2)/Vs.
Article
Materials Science, Multidisciplinary
I. L. Drichko, I. Yu Smirnov, A. Suslov, K. W. Baldwin, L. N. Pfeiffer, K. W. West
Summary: The effect of spin-orbit interaction on a high-quality p-AlGaAs/GaAs/AlGaAs structure with a square quantum well was studied using acoustic methods. By measuring the ac conductance oscillations of two-dimensional holes, the contributions from different heavy-hole subbands were separated, allowing for the determination of the energy of the spin-orbit interaction.
