Arman Ud Duha - Academia.edu (original) (raw)
Papers by Arman Ud Duha
Physical review. A/Physical review, A, Jun 26, 2024
arXiv (Cornell University), Mar 6, 2024
arXiv (Cornell University), Feb 28, 2024
We study the non-equilibrium dynamics of a quantum spin 1/2 XXZ model confined in a twodimensiona... more We study the non-equilibrium dynamics of a quantum spin 1/2 XXZ model confined in a twodimensional bi-layer system, with couplings mediated by inverse power-law interactions, falling off with distance r as 1/r α , with spatio-temporal control of the spins enabled via local fields. An initial state of spins with opposite magnetization in the two layers is dynamically unstable resulting in exponential generation of correlated pairs of excitations. We find that scalabale generation of entanglement in the form of two-mode squeezing between the layers can generically be achieved in powerlaw models. We further demonstrate that spatially-temporally engineered interactions allow to significantly increase the generated entanglement and in fact achieve Heisenberg limited scaling. This work is relevant to a wide variety of experimental atomic, molecular, and optical platforms, which realise powerlaw spin models, and demonstrates the advantage of spatio-temporal control to maximise the generation of metrologically useful entanglement, with potential applications in quantum-enhanced sensing.
Optical Materials, 2022
We present simulation results obtained with the SCAPS-1D simulation package of a lead-free all-pe... more We present simulation results obtained with the SCAPS-1D simulation package of a lead-free all-perovskite tandem solar cell. The top and bottom subcells, consisting of MAGeI3, and FASnI3, respectively, were optimized
individually by varying material properties such as thickness, electron affinity, and capture cross-section. These
standalone optimized subcells are then utilized for the tandem structure. The optimal tandem cell thickness was
determined based on short circuit current density (JSC) matching of the standalone subcells by varying the
subcells’ thickness. A matching JSC of 14.70 mA/cm2 was obtained for the top and bottom subcell thickness of
983 nm and 1600 nm, respectively. At this current matching condition, the simulation show that a tandem cell
would yield a high open-circuit voltage (VOC) of 2.63 V, resulting in an efficiency of 30.85%, significantly higher
than that of each subcell.
In this paper we consider an electron moving on a two dimensional noncommutative plane immersed i... more In this paper we consider an electron moving on a two dimensional noncommutative plane immersed in a constant magnetic field under the influence of an anisotropic harmonic potential. We work out the gauge invariant energy spectra of this system using a consistent gauge prescription proposed in <cit.>. We also show subsequently that straightforward generalization of the Landau problem in the noncommutative setting using minimal coupling prescription as is done naively on many occasions in the literature violates gauge invariance of the energy spectra.
arXiv: Mathematical Physics, 2020
In this paper we consider an electron moving on a two dimensional noncommutative plane immersed i... more In this paper we consider an electron moving on a two dimensional noncommutative plane immersed in a constant magnetic field under the influence of an anisotropic harmonic potential. We work out the gauge invariant energy spectra of this system using a consistent gauge prescription proposed in \cite{nctori,gauge-wigfunc}. We also show subsequently that straightforward generalization of the Landau problem in the noncommutative setting using minimal coupling prescription as is done naively on many occasions in the literature violates gauge invariance of the energy spectra.
Annals of Physics, 2021
In this paper, we consider an electron moving on a 2D noncommutative plane immersed in a constant... more In this paper, we consider an electron moving on a 2D noncommutative plane immersed in a constant magnetic field under the influence of a polynomial potential. We obtain gauge invariant energy spectra of this system using 2-parameter family of unitarily equivalent irreducible representations of the nilpotent Lie group GNC that were worked out in detail in [7]. We work out the cases of anisotropic harmonic potential and the Hall potential as physical applications of the proposed method. We also show subsequently that straightforward generalization of the Landau problem and the quantum Hall effect in the noncommutative setting using minimal coupling prescription as is done naively on many occasions in the literature violate gauge invariance of energy spectra.
Physical review. A/Physical review, A, Jun 26, 2024
arXiv (Cornell University), Mar 6, 2024
arXiv (Cornell University), Feb 28, 2024
We study the non-equilibrium dynamics of a quantum spin 1/2 XXZ model confined in a twodimensiona... more We study the non-equilibrium dynamics of a quantum spin 1/2 XXZ model confined in a twodimensional bi-layer system, with couplings mediated by inverse power-law interactions, falling off with distance r as 1/r α , with spatio-temporal control of the spins enabled via local fields. An initial state of spins with opposite magnetization in the two layers is dynamically unstable resulting in exponential generation of correlated pairs of excitations. We find that scalabale generation of entanglement in the form of two-mode squeezing between the layers can generically be achieved in powerlaw models. We further demonstrate that spatially-temporally engineered interactions allow to significantly increase the generated entanglement and in fact achieve Heisenberg limited scaling. This work is relevant to a wide variety of experimental atomic, molecular, and optical platforms, which realise powerlaw spin models, and demonstrates the advantage of spatio-temporal control to maximise the generation of metrologically useful entanglement, with potential applications in quantum-enhanced sensing.
Optical Materials, 2022
We present simulation results obtained with the SCAPS-1D simulation package of a lead-free all-pe... more We present simulation results obtained with the SCAPS-1D simulation package of a lead-free all-perovskite tandem solar cell. The top and bottom subcells, consisting of MAGeI3, and FASnI3, respectively, were optimized
individually by varying material properties such as thickness, electron affinity, and capture cross-section. These
standalone optimized subcells are then utilized for the tandem structure. The optimal tandem cell thickness was
determined based on short circuit current density (JSC) matching of the standalone subcells by varying the
subcells’ thickness. A matching JSC of 14.70 mA/cm2 was obtained for the top and bottom subcell thickness of
983 nm and 1600 nm, respectively. At this current matching condition, the simulation show that a tandem cell
would yield a high open-circuit voltage (VOC) of 2.63 V, resulting in an efficiency of 30.85%, significantly higher
than that of each subcell.
In this paper we consider an electron moving on a two dimensional noncommutative plane immersed i... more In this paper we consider an electron moving on a two dimensional noncommutative plane immersed in a constant magnetic field under the influence of an anisotropic harmonic potential. We work out the gauge invariant energy spectra of this system using a consistent gauge prescription proposed in <cit.>. We also show subsequently that straightforward generalization of the Landau problem in the noncommutative setting using minimal coupling prescription as is done naively on many occasions in the literature violates gauge invariance of the energy spectra.
arXiv: Mathematical Physics, 2020
In this paper we consider an electron moving on a two dimensional noncommutative plane immersed i... more In this paper we consider an electron moving on a two dimensional noncommutative plane immersed in a constant magnetic field under the influence of an anisotropic harmonic potential. We work out the gauge invariant energy spectra of this system using a consistent gauge prescription proposed in \cite{nctori,gauge-wigfunc}. We also show subsequently that straightforward generalization of the Landau problem in the noncommutative setting using minimal coupling prescription as is done naively on many occasions in the literature violates gauge invariance of the energy spectra.
Annals of Physics, 2021
In this paper, we consider an electron moving on a 2D noncommutative plane immersed in a constant... more In this paper, we consider an electron moving on a 2D noncommutative plane immersed in a constant magnetic field under the influence of a polynomial potential. We obtain gauge invariant energy spectra of this system using 2-parameter family of unitarily equivalent irreducible representations of the nilpotent Lie group GNC that were worked out in detail in [7]. We work out the cases of anisotropic harmonic potential and the Hall potential as physical applications of the proposed method. We also show subsequently that straightforward generalization of the Landau problem and the quantum Hall effect in the noncommutative setting using minimal coupling prescription as is done naively on many occasions in the literature violate gauge invariance of energy spectra.