Bulletin of the American Physical Society
Mid-Atlantic Section Fall Meeting 2020
Volume 65, Number 20
Friday–Sunday, December 4–6, 2020; Virtual
Session F05: Quantum Materials on Nanoscale III |
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Chair: Dorri Halbertal, Columbia University |
Saturday, December 5, 2020 2:00PM - 2:36PM |
F05.00001: Computational-enabled Design and Electrostatic Doping in 2D Materials for Quantum and Neuromorphic Information Processing Invited Speaker: Chinedu Ekuma van der Waals (vdW) materials designed with 2D materials exhibit one of the broadest sets of novel properties that are highly desirable for enabling heterogeneous device concepts such as neuromorphic and quantum computing. Their flexible electronic structures facilitate efficient control and tuning of both the carrier dynamics and charge injection with either chemical or electrical doping. In this talk, I will demonstrate some of our recent findings unveiling a unique material design concept at the interface of molecular electronics and 2D-based vdW materials. We achieved efficient electrostatic doping in transition metal dichalcogenide based homostructure of HfS$_{\mathrm{2}}$ by electrochemical intercalation of organometallic molecular species of the metallocene family -- MCP$_{\mathrm{2}}$ (M $=$ Cr, Co, Fe, Ni, etc.). The molecular intercalants behave as pseudo-alkali atoms transferring electrons to the host material. The designed HfS$_{\mathrm{2}}$-CrCP$_{\mathrm{2}}$ hybrid material revealed multi-switching capabilities with ultrahigh dynamical control of over 400 folds (i.e., from 1.8 $\mu $/cm to 741 $\mu $/cm) of the cross-planar electrical conductivity. Our findings show a promising route to create an organic/inorganic interface that tunes and tailor the properties of host materials for novel device applications such as quantum and neuromorphic information processing. I will discuss a proposed machine-learning-enabled design approach to speed up the material design process -- identifying both the host material and promising molecular guest species. [Preview Abstract] |
Saturday, December 5, 2020 2:36PM - 3:12PM |
F05.00002: Optimization of materials for quantum computing technologies Invited Speaker: Ignace Jarrige The biggest roadblock towards the experimental realization of a universal, fault-tolerant quantum computer -- the holy grail of quantum computation -- is the limited coherence time of superconducting qubits. Recent breakthroughs have highlighted the prominent role played by the defect-prone native surface oxide layers in limiting the coherence time. However, very little is known about the nature of the defects and their mechanism of coupling to the qubit degree of freedom, in part due to the lack of suitable probes for defects in thin amorphous layers. Here, we report on the combined use of microscopy and synchrotron-based X-ray probes to investigate the surface and bulk electronic, structural and morphological properties of metal thin films used in the fabrication of superconducting qubits. We discuss correlations between these properties and relaxation times measured on transmon qubits made from the same films, and the benefits of a systematic iterative process between materials characterization and qubit measurements. [Preview Abstract] |
Saturday, December 5, 2020 3:12PM - 3:24PM |
F05.00003: Room-Temperature Cavity QED with Single Quantum Dots and Plasmonic Nanocavities Matthew Pelton Coupling a single emitter to a single mode of an optical cavity has the potential to enable optical nonlinearities at ultralow optical powers, opening up applications in all-optical classical and quantum information processing. These applications arise both in the strong-coupling (Rabi-splitting) regime and in the high-cooperativity (induced-transparency) regime, which both require coupling strengths to be large compared to decoherence rates of the emitter and of the cavity photons. In previous demonstrations using photonic cavities, the diffraction limit has placed a maximum on the coupling strength that can be obtained, so that cryogenic temperatures were required. Using plasmonic nanocavities overcomes this restriction, enabling strong-coupling and high-cooperativity regimes to be reached for single emitters at room temperatures. We have demonstrated these effects using single colloidal quantum dots in nanocavities formed between a metal nanoparticle and a metal film, or between a metal scanning-probe tip and a metal film. Current work is focused on developing assembly and fabrication methods for the high-yield production of assemblies with high coupling strengths. [Preview Abstract] |
Saturday, December 5, 2020 3:24PM - 4:00PM |
F05.00004: Imaging energy transport and inter-particle interactions at the nanoscale Invited Speaker: Milan Delor The ability of energy carriers to move within and between atoms and molecules underlies virtually all material function. Understanding and controlling energy flow requires observing it on ultrasmall and ultrafast spatiotemporal scales, where heterogeneities and inter-particle interactions dictate material function. I will describe a novel optical ultrafast microscope based on interferometric elastic scattering that enables direct visualization of energy carrier transport in 3D with few-nm spatial precision and picosecond temporal resolution, thus acting as a contact-free, hyper-local transport measurement. I will demonstrate how this approach enables watching free charges, excitons, phonons and ions move in materials ranging from silicon to conjugated polymers via 2D transition metal dichalcogenides, cuprates and perovskites, thus providing much sought-after quantification of local mobilities for an array of photoexcited species. Finally, I will show that the extreme sensitivity of our approach to quasiparticle density provides a powerful opportunity to explore how many-particle interactions between free charges, excitons, phonons and defects emerge and contribute to material function in correlated materials. [Preview Abstract] |
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