Chemi-Structural Stabilization of Formamidinium Lead Iodide Perovskite by Using Embedded **Quantum** **Dots** for High-Performance Solar Cells

**quantum**

**dots**(QDs) as stabilizing agent for the FAPI perovskite black phase. Expand abstract.

**quantum**

**dots**(QDs) as stabilizing agent for the FAPI perovskite black phase. The surface chemistry of PbS plays a pivotal role, by developing strong bonds with the black phase but weak ones with the yellow phase. As a result, stable FAPI black phase can be formed at temperatures as low as 85°C in just 10 minutes, setting a record of concomitantly fast and low temperature formation for FAPI, with important consequences for industrialization. FAPI thin films obtained through this procedure preserve the original low band gap of 1.5 eV, reach a record open circuit potential (Voc) of 1.105 V -91% of the maximum theoretical Voc- and preserve high efficiency for more than 700 hours. These findings reveal the potential of strategies exploiting the chemi-structural properties of external additives to relax the tolerance factor and optimize the optoelectronic performance of perovskite materials.

10/10 relevant

chemRxiv

Unconventional Photon blockade in a Photonic Molecule Containing a
**Quantum** **Dot**

**quantum**

**dot**(QD). Expand abstract.

**quantum**

**dot**(QD). This strong photon antibunching is attributed to destructive

**quantum**interference effect which suppresses the two-photon excitation of the cavity field. That g^2 (0)~10^(-4) can be achieved with modest QD-cavity coupling strength g=1.1k and cavity tunneling strength J=3k when the system is driven by single laser field. To further reduce the requisite tunneling and make the system tunable, two laser fields are applied to the system. The strong photon antibunching (g^2 (0)~10^(-3)) can be achieved with a relatively large intracavity photon number by optimizing the phase between two driving laser fields when J=0.9k. Moreover, the system shows a strong robustness of maintaining strong photon antibunching within a large parameter variation under the optimal phase condition. Our scheme provides a flexible and efficient method for solid state

**quantum**single photon sources.

7/10 relevant

arXiv

Tunable single photon and two-photon emission in a four-level **quantum**
**dot**-bimodal cavity system

**quantum**electrodynamics system of a four-level quantum

**dot**coupled to bimodal cavity. Expand abstract.

**quantum**electrodynamics system of a four-level

**quantum**

**dot**coupled to bimodal cavity. By tuning frequencies and intensity ratio of the driving lasers, sub-Poissonian and super-Poissonian photon statistics are obtained in each nondegenerate cavity mode respectively. Single photon emission is characterized as zero-delay second-order correlation function g^2(0)~0.15. Photon pair emission under the two-photon resonance excitation is quantified by Mandel parameter as Q~0.04. The mean cavity photon number in both scenarios can maintain large around 0.1. As a result, single photon emission and two-photon emission can be integrated in our proposed system only by tuning the external parameters of the driving lasers.

7/10 relevant

arXiv

Energy Levels of Graphene Magnetic Circular **Quantum** **Dot**

**quantum**

**dot**surrounded by an infinite graphene sheet in the presence of an electrostatic potential. We solve Dirac equation to derive the solutions of energy spectrum associated with different regions composing our system. Using the continuum model and applying boundary conditions at the interface, we obtain analytical results for the energy levels. The dependence of the energy levels on the

**quantum**

**dot**radius, magnetic field and electrostatic potential is analyzed for the two valleys $K$ and $K'$. We show that the energy levels exhibit characteristics of interface states and have an energy gap.

8/10 relevant

arXiv

Limits of Adiabatic Clocking in **Quantum**-**dot** Cellular Automata

**quantum**

**dot**cellular automata devices have yet to be established. Expand abstract.

**quantum**

**dot**cellular automata devices have yet to be established. We consider the adiabaticity of such networks in the two-state approximation where clocking is achieved via modulation of the inter-

**dot**tunneling barriers. Estimates of the maximum operating frequency that would allow a 99% probability of observing the correct logical output are presented for a subset of the basic components used in QCA network design. Simulations are performed both in the coherent limit and for a simple dissipative model. We approach the problem of tunnel-based clocking from the perspective of

**quantum**annealing, and present an improved clocking schedule allowing for faster operation. Using an analytical solution for driven QCA wires, we show that the maximum operating frequency in the coherent limit falls off with the square of the wire length, potentially limiting the size of clocked regions.

7/10 relevant

arXiv

Mesoscopic Stoner instability in open **quantum** **dots**: suppression of
Coleman-Weinberg mechanism by electron tunneling

**quantum**

**dots**, underlined by the competition between single-particle energy and Heisenberg exchange interaction. Expand abstract.

**quantum**dots, underlined by the competition between single-particle energy and Heisenberg exchange interaction. Here we study this phenomenon in the presence of tunnel coupling to a reservoir. We analyze the spin susceptibility of electrons on the

**quantum**

**dot**for different values of couplings and temperature. Our results indicate the existence of a

**quantum**phase transition at a critical value of the tunneling coupling, which is determined by the Stoner-enhanced exchange interaction. This

**quantum**phase transition is a manifestation of the suppression of the Coleman-Weinberg mechanism of symmetry breaking, induced by coupling to the reservoir.

10/10 relevant

arXiv

Near-Infrared Lead Chalcogenide **Quantum** **Dots**: Synthesis and Applications
in Light Emitting Diodes

**quantum**

**dots**(QDs) and their applications in NIR QDs based light emitting diodes (NIR-QLEDs). Expand abstract.

**quantum**

**dots**(QDs) and their applications in NIR QDs based light emitting diodes (NIR-QLEDs). It summarizes the strategies of how to synthesize high efficiency PbX QDs and how to realize high performance PbX based NIR-QLEDs.

9/10 relevant

arXiv

Continuous two-photon source using a single **quantum** **dot** in a photonic
crystal cavity

**quantum**

**dot**. Expand abstract.

**quantum**

**dot**embedded inside a photonic crystal cavity. We analyze steady state population in

**quantum**

**dot**energy levels and field inside the cavity mode. We find conditions for population inversion in coherently pumped and incoherently pumped

**quantum**

**dot**. We show that squeezing in the output for two two photon laser is not visible using coherent as well as incoherent pump. We discuss effect of phonon coupling using recently developed polaron transformed master equation at low temperatures. We also propose scheme for generating squeezed state of field using four wave mixing.

8/10 relevant

arXiv

Electronic structure and transport properties of coupled CdS/ZnSe
**quantum** **dots**

**quantum**

**dot**using non equilibrium Greens function (NEGF) method by varying the coupling strength between the individual quantum

**dots**in the limits of weak and strong coupling. Expand abstract.

**quantum**

**dots**are studied using density functional theory (DFT). Our investigations show that in these novel coupled dots, the frontier occupied and unoccupied molecular orbitals are spatially located in two different parts of the coupled dot, thereby indicating the possibility of asymmetry in electronic transport. We have calculated electronic transport through the coupled

**quantum**

**dot**using non equilibrium Greens function (NEGF) method by varying the coupling strength between the individual

**quantum**

**dots**in the limits of weak and strong coupling. Calculations reveal asymmetric current vs voltage curves in both the limits indicative of its rectifying properties. Additionally our calculations suggest the possibility to tune the switching behavior of the coupled

**dots**by different gate geometries.

10/10 relevant

arXiv

Super-statistical description of thermo-magnetic properties of a system
of 2D GaAs **quantum** **dots** with gaussian confinement and Rashba spin-orbit
interaction

**quantum**

**dots**in the presence of an external uniform and constant magnetic field. The model consists of a single-electron subject to a confining Gaussian potential with a spin-orbit interaction in the Rashba approach. We compute the specific heat and the magnetic susceptibility within the formalism of $\chi^2$-superstatistics from the exact solution of the Schr\"odinger equation. Furthermore, an analytic solution for the partition function allows a study of the impact of the number of subsystems on the superstatistical corrections and confirms that the ordinary thermo-magnetic properties are recovered whenever the thermal distribution can be approximated by a Dirac delta. Also, we found a progressive disappearance of the Schottky anomaly with decreasing number of subsystems, while the specific heat ceases to be a monotonically increasing function with respect to the average temperature when the $\chi^2$-distribution is spread over a large range of temperatures. Remarkably, the introduction of fluctuations in the temperature is found to suppress the paramagnetic phase transition that would otherwise appear at low temperatures. Finally, we emphasize that an appropriate construction of the definition of physical observables is crucial for obtaining a correct description of the physics derived from a non-extensive construction of the entropy.

10/10 relevant

arXiv