A5007979834- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Perovskite Materials and Applications
- Quantum Computing Algorithms and Architecture
- Quantum, superfluid, helium dynamics
- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Quantum Mechanics and Non-Hermitian Physics
- Mechanical and Optical Resonators
- Nonlinear Photonic Systems
- 2D Materials and Applications
- Luminescence Properties of Advanced Materials
- Radiation Detection and Scintillator Technologies
- Quantum optics and atomic interactions
- Quantum chaos and dynamical systems
- Advanced Photocatalysis Techniques
- Advanced Frequency and Time Standards
- Astro and Planetary Science
- Advanced Chemical Sensor Technologies
- Quantum Mechanics and Applications
- Nanocluster Synthesis and Applications
- Solid State Laser Technologies
- Optical Network Technologies
COMSATS University Islamabad
2016-2023
Freie Universität Berlin
2016-2018
Quaid-i-Azam University
2008-2009
Organometallic perovskites have great potential for their utilization in photodetectors. However, the photoresponsivity of perovskite film is limited by low light absorption and charge transport capability. The preparation good quality with higher light-harvesting capability on substrate has been a challenging job until now. In this work, we developed high-quality white fluorescence graphene quantum dots CH3NH3PbI3 hybrid one-step solvent-induced fast deposition–crystallization technique...
Abstract Trapped-ion hardware based on the Magnetic Gradient Induced Coupling (MAGIC) scheme is emerging as a promising platform for quantum computing. Nevertheless, in this—as any other—quantum-computing platform, many technical questions still have to be resolved before large-scale and error-tolerant applications are possible. In this work, we present thorough discussion of structure effects higher-order terms MAGIC setup, which can occur due anharmonicities external potential ion crystal...
Abstract Quantum annealing aims at solving optimization problems of practical relevance using quantum-computing hardware. Problems interest are typically formulated in terms quadratic unconstrained binary (QUBO) Hamiltonians. However, many much more naturally polynomial (PUBO) functions higher order. As we show with various problem examples, leveraging the PUBO formulation can bring considerable savings required number qubits. Moreover, numerical benchmarks for paradigmatic 3-SAT problem,...
Motivated by recent experiments, we investigate a single $^{133}\text{Cs}$ impurity in the center of trapped $^{87}\text{Rb}$ Bose-Einstein condensate. Within zero-temperature mean-field description provide one-dimensional physical intuitive model which involves two coupled differential equations for condensate and wave function, solve numerically. With this determine within equilibrium phase diagram spanned intra- inter-species coupling strength, whether is localized at trap or expelled to...
Recent years, organic-inorganic hybrid perovskites (OIHPs) have been widely used in applications, such as solar cells, lasers, light-emission diodes, and photodetectors due to their outstanding optoelectronic properties. Nowadays based on perovskite films (PFs) suffer from surface interface traps, which result low crystalline quality of lattice mismatch between substrates. Herein, we fabricate MAPbI 3 -(MA = CH NH ) single-crystal (SCFs) MAPbBr single crystal substrates precursor solution...
Zero-dimension (0-D) lead halide perovskite nanocrystals (NCs) have attracted a sight of interest in the field optoelectronic devices due to their outstanding properties, such as high photoluminescence quantum yield (PLQY) and size- composition-controlled tunable emission wavelengths. However, toxicity (Pb) element NCs is bottleneck for commercial application NCs. Herein, we report facile ligand-assisted synthesis achieve lead-free Cs 3 Cu 2 Cl 5 with PLQY ∼70% good stability against...
A facile and effective surface passivation strategy via congeneric quantum dots is demonstrated to produce CsPbBr<sub>3</sub> films with improved morphology reduced defects, enhancing the performance stability of CsPbBr<sub>3</sub>-based photodetectors.
All-inorganic quantum dot light-emitting diodes (QLEDs) show promise for advanced lighting and display due to their superior advantage in stability. However, all-inorganic QLEDs suffer from low efficiency because of the exciton quenching inefficient hole transport inorganic layer (HTL) QDs. Herein, we demonstrate an efficient QLED with NiO nanoparticles (NPs) HTL modified by 11-mercaptoundecanoic acid (MUA). The MUA can passivate defects suppress quenching. Moreover, declined valence band...
We investigate a quasi one-dimensional Bose–Einstein condensate in harmonic trap with an additional dimple (dT) the center. Within zero-temperature Gross–Pitaevskii mean-field description we provide physical intuitive model, which solve by both time-independent variational approach and numerical calculations. With this obtain at first equilibrium results for emerging wave function reveal that potential induces bump or dip case of red- blue-detuned Gaussian laser beam, respectively....
We explore theoretically how to tune the dynamics of a quasi-one-dimensional harmonically trapped Bose-Einstein condensate (BEC) due an additional red- and blue-detuned Hermite-Gaussian dimple trap (HGdT). To this end we study BEC in highly nonequilibrium state, which is not possible traditional confined trap. Our system modeled by time-dependent Gross-Pitaevskii equation, numerically solved Crank-Nicolson method both imaginary real time. For equilibrium, obtain with two bumps or dips are...
Organic-inorganic hybrid methylammonium lead halide perovskite MAPbX3 (where MA = CH 3 NH , and X Cl, Br, I) single crystals are potential semiconductors for photo-detection due to their excellent optoelectronic performance. In particular, MAPbCl crystal is a wide-band-gap (2.9 eV) semiconductor which suitable ultraviolet (UV) detection. this work, n − -n + photo-diodes fabricated through solution-processed epitaxial growth, growing Bi-doped layer on substrate. The effectively improves the...
We study both static and dynamic properties of a weakly interacting Bose-Einstein condensate (BEC) in quasi one-dimensional gravito-optical surface trap, where the downward pull gravity is compensated by exponentially decaying potential an evanescent wave.First, we work out approximate solutions Gross-Pitaevskii equation for small number atoms using Gaussian ansatz larger Thomas-Fermi limit.Then confirm accuracy these analytical comparing them to numerical results.From there, numerically...
Abstract Non-Hermitian systems with parity-time $$\mathcal {(PT)}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>PT</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> symmetry and anti-parity-time {(APT)}$$ <mml:mi>APT</mml:mi> have exceptional points (EPs) resulting from eigenvector co-coalescence properties. In the quantum classical domains, higher-order EPs for $${{\mathcal {P}}}{{\mathcal {T}}}$$ <mml:mi>P</mml:mi> <mml:mi>T</mml:mi>...
Cold Atoms bouncing on modulated atomic mirror exhibits acceleration and dynamical localization subject to strength. We explain characteristics of define control parameters in terms effective Planck′s constant. show that the constant plays a vital role limiting classical‐like overall linear growth variance accelerated atoms with time. For large values quantum is seized as window overlaps window.
We investigate the properties of a distinguishable single excited state impurity pinned in center trapped Bose–Einstein condensate one-dimensional harmonic trapping potential by changing bare mass and its interspecies interaction strength with condensate. model our system using two coupled differential equations for excited-impurity wave function, which we solve numerically. For equilibrium, find that an induces bumps or dips on attractive- repulsive-interspecies coupling strengths,...
Trapped-ion hardware based on the Magnetic Gradient Induced Coupling (MAGIC) scheme is emerging as a promising platform for quantum computing. Nevertheless, in this (as any other) quantum-computing platform, many technical questions still have to be resolved before large-scale and error-tolerant applications are possible. In work, we present thorough discussion of contribution higher-order terms MAGIC setup, which can occur due anharmonicities external potential ion crystal (e.g., through...