Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session GG01: V: Nanostructures and Metamaterials |
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Sponsoring Units: DMP Chair: James Rondinelli, Northwestern University Room: Virtual Room 1 |
Monday, March 20, 2023 12:30PM - 12:42PM |
GG01.00001: Adjoint-Based Inverse Design with Transfer Matrices Eric Y. Ma, Nathaniel Morrison Inverse design (InvDes) with gradient-based optimization has become a practical method to design high-performance physical structures that are nearly impossible to produce with human intuition. In particular, InvDes of nanophotonic devices with adjoint method and finite-difference electromagnetic simulation has made significant strides towards solving real-world issues and advancing fundamental science. Here we demonstrate adjoint-based InvDes with the transfer matrix method (TMM). Thanks to the broad applicability of TMM, we show that we can design non-intuitive, high-performance layered structures for photonics, acoustics, thermal, and quantum applications. |
Monday, March 20, 2023 12:42PM - 12:54PM |
GG01.00002: Time crystals for exciton polaritons in a TMDC nanoribbon embedded in an optical microcavity Oleg L Berman, Gabriel P Martins, Godfrey Gumbs We investigated the dynamics of a Bose-Einstein condensate of exciton polaritons in a nanoribbon of transition metal dichalcogenides (TMDCs), such as MoSe2, embedded in a microcavity in the presence of an external periodic potential. We have shown that the system exhibits signs of a time crystalline phase [1]. It has been demonstrated that this phase prevails even as the width of this ribbon is increased to infinity. This was demonstrated by the fact that the calculated polariton spatial density profile is characterized by self-sustained oscillations over time. This polariton density profile was calculated by solving the quantum Lindblad master equation for the density matrix within the mean field approximation. We also go beyond mean field theory and consider the first-order correction due to the addition of quantum noise and show that our results still hold even in this regime. This novel time crystal (TC) proposal has the advantage of being, in principle, achievable even at room-temperature. |
Monday, March 20, 2023 12:54PM - 1:06PM |
GG01.00003: Brewster angle of thermal diffusivity waves at an interface Jesus Manzanares Martinez In this work, we study the existence of the Brewster angle for thermal diffusivity waves. We analyze the propagation of plane thermal waves impinging upon an interface between two media. The condition of zero-reflection defines the Brewster angle. We demonstrate that the Brewster angle only exists for specific combinations of diffusivity and thermal conductivity of the incidence and transmission media. |
Monday, March 20, 2023 1:06PM - 1:18PM |
GG01.00004: Exceptional point based sensing via nanostructured photonic waveguide Parul Sharma, Brijesh Kumar, ANSHUMAN KUMAR Non-Hermitian systems with varying loss-gain profiles are receiving significant attention due to their exotic behavior at a certain point called the exceptional point (EP). EPs are singularities of non-Hermitian systems where the eigenfrequencies as well as the associated eigenstates coalesce. These EP singularities are ultrasensitive to small perturbations. A conventional system follows a linear relation with perturbation whereas these singularities follow a square root dependence for small perturbations. |
Monday, March 20, 2023 1:18PM - 1:30PM |
GG01.00005: Modeling of artificial semiconductor quantum neural network from first principles Krzysztof D Pomorski
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Monday, March 20, 2023 1:30PM - 1:42PM |
GG01.00006: Design and fabrication of resonant structures with diamond for efficient light extraction SAGAR CHOWDHURY, Rituraj, Srinivasan Krishnamurthy, Vidya Praveen Bhallamudi Optically active defects, such as nitrogen-vacancy or silicon-vacancy centers in diamond, show exciting properties such as the emission of single photons and multi-photic states (e.g. superradiance), and optically detected magnetic resonance. These can lead to applications in quantum and other emerging technologies. In order to build a diamond-based quantum system, efficient fluorescence collection from the defect centers and engineering their spectral and modal features are crucial. Here, we will report our results on the light collection efficiency and controlling the emission studies in shape-dependent Mie-resonant structures with embedded colour centers. We predict the performance using Finite-Difference Time-Domain (FDTD) method. Further, we will discuss our progress related to the fabrication and characterization of these structures. |
Monday, March 20, 2023 1:42PM - 1:54PM |
GG01.00007: On superfluidity of indirect excitons in transition metals trichalcogenides van der Waals heterostructures Anastasia Spiridonova, Roman Y Kezerashvili We study within a mean-field approach and the Bogoliubov approximation superfluidity of indirect excitons in transition metals trichalcogenides (TMTC) van der Waals heterostructures (vdWHs) composed from two TMTC monolayers separated by a varying number of hBN layers. We predict the angle-dependent superfluidity of indirect excitons in vdWHs that arise due to anisotropy of electron-hole masses. It is demonstrated that angle-dependent critical temperature Tc for superfluidity occurs beyond the sound-like approximation for the spectrum of collective excitation: for a given exciton density a maximum and minimum Tc of superfluidity is along chain and a-directions, respectively. In contrast to the anisotropic behavior of Tc for phosphorene [1], the vastly different angular dependence of Tc is observed for ZrS3. In calculations, we used the Rytova-Keldysh (RK) and Coulomb potentials for charged carriers interaction to analyze the screening influence. For both potentials, the angle-dependent superfluidity of indirect excitons is observed. The critical temperature for the phase transition obtained using Coulomb potential is significantly larger than Tc calculated with RK potential. We suggest the experiment to observe the electron-hole superfluidity in a dilute weakly interacting gas of indirect excitons in TMTC vdWH. |
Monday, March 20, 2023 1:54PM - 2:06PM |
GG01.00008: Formation of Frank-Kasper phases from interacting hard-spheres Yu Li, Anchang Shi, Jiayu Xie The emergence of Frank-Kasper phases from interacting hard-spheres is studied using density functional theory. Specifically, the phase behaviour of the hard spheres with short-range attractive and long-range repulsive (SALR) interaction potentials is examined by using three version of hard-sphere models: the lattice gas model, the Carnahan-Starling approximation, and the fundamental measure theory. The competition between the attractive and repulsive interactions results in the formation of clusters composed of many particles, whereas the packing of these clusters leads to the formation of long-range ordered phases. Phase diagrams containing the commonly observed BCC and FCC phases, as well as the novel Frank-Kasper sigma and A15 phases, have been constructed. Similar phase transition sequences have been predicted using the three versions of density functional theory. However, the details of the phase diagrams could vary significantly. In particular, the local packing effect of particles within the clusters is obtained from the accurate fundamental measure theory. The results obtained from the study provide strong theoretical justification of the universality of phase transition sequences observed in various soft matter systems. |
Monday, March 20, 2023 2:06PM - 2:18PM |
GG01.00009: Collective behavior of Janus Particles Suspended in a Viscous Fluid Yuan-Nan Young, Szu-Pei Fu, Bryan Quaife, Rolf J Ryham Active colloidal systems with non-equilibrium self-organization is a long-standing challenge in biology. To understand how hydrodynamic flow may be used to actively control self-assembly of Janus particles (JPs), we use a model recently developed for the many-body hydrodynamics of amphiphilic JPs under a viscous background flow (JFM, 941, 2022) to investigate how various bilayer structures arise from tuning the hydrophobicity/hydrophilicity of the JPs. Focusing on three distributions of hydrophobicity we found JPs may assemble into uni-lamella, multi-lamella, and striated structures in a viscous fluid. Under a linear flow and a Taylor-Green mixing flow, we use three measures to quantify the collective dynamics of JP particles under a background flow: (a) Free energy from the hydrophobic interactions between the JPs, (b) an order parameter for the ordering of JPs in terms of alignment of their directors, and (c) a strain parameter that captures the deformation in the assembly. We found the dynamics of these three measures correlate well with the hydrodynamics of JPs. These numericals provide insights into dynamic control of non-equilibrium active biological systems with similar self-organization. |
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