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 EE08: V: Nanophysics |
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Sponsoring Units: FIAP Chair: Eric Y. Ma, UC Berkeley Room: Virtual Room 8 |
Monday, March 20, 2023 10:00AM - 10:12AM |
EE08.00001: Anti-ambipolar phototransistors based on 1D GaAsSb/2D MoS2 heterojunctions Johnny C Ho, Wei Wang The incapability of modulating the photoresponse of the assembled heterostructure devices has remained a challenge for the development of optoelectronics with multi-functionality. In this presentation, a gate-tunable and anti-ambipolar phototransistor is reported based on 1D GaAsSb nanowire/2D MoS2 nanoflake mixed-dimensional van der Waals (vdW) heterojunctions. The resulting heterojunction shows apparently asymmetric control over the anti-ambipolar transfer characteristics, possessing potential to implement electronic functions in logic circuits. Meanwhile, such anti-ambipolar device allows the synchronous adjustment of band slope and depletion regions by gating in both components, thereby giving rise to the gate-tunability of photoresponse. Coupled with the synergistic effect of the materials in different dimensionality, the hybrid heterojunction can be readily modulated by the external gate to achieve a high-performance photodetector exhibiting a remarkable on/off current ratio of 4×104, fast response of 50 μs and high detectivity of 1.64×1011 Jones. Due to the formation of type-II band alignment and strong interfacial coupling, a prominent photovoltaic response is explored in the heterojunction as well. Finally, a visible image sensor based on this hybrid device is demonstrated with excellent imaging capability, suggesting the promising application prospect in future optoelectronic systems. |
Monday, March 20, 2023 10:12AM - 10:24AM |
EE08.00002: Discrimination of Umami Tastants Using Carbon Nanotube-Based Bioelectronic Tongue Mimicking Insect Taste Systems Yoonji Choi, Minju Lee, Daesan Kim, Seungha Lee, Seunghun Hong, Hyung Wook Kwon We report a carbon nanotube-based bioelectronic tongue mimicking insect taste systems for the discrimination of umami tastants. In this work, nanovesicles including honeybee umami taste receptors were hybridized on a carbon nanotube field-effect transistor (CNT-FET) with floating electrodes to construct a bioelectronic tongue. This bioelectronic tongue enabled us to detect L-monosodium glutamate (MSG) with a high sensitivity and discriminate between MSG from non-umami tastants. Furthermore, it could also be utilized to directly detect umami tastants in liquid food such as chicken stock. Importantly, we could quantitatively evaluate the synergistic effects between MSG and disodium 5'-inosinate (IMP) using our platform. This bioelectronic tongue mimicking insect taste systems can be an effective strategy as an artificial taste sensor, providing broad opportunities for basic studies on animal taste systems and various applications in food industries. |
Monday, March 20, 2023 10:24AM - 10:36AM |
EE08.00003: Nanovesicle-carbon nanotube hybrid device for the evaluation of site-selective drug effects on GABA receptors Inkyoung Park We report a nanovesicle-carbon nanotube hybrid device for the evaluation of drug effects on ion-channel activities of γ-aminobutyric acid type A (GABAA) receptors. Here, carbon nanotube field-effect transistor (CNT-FET) devices were fabricated via microfabrication processes, and nanovesicles containing GABAA receptors were immobilized on the channel region of CNT-FET. This device allowed us to selectively detect GABA responses with a high sensitivity down to 1 aM. Further, we could discriminate well-known sensitivity differences between two GABAA-receptor-subunit compositions of α5β2γ2 and α1β2γ2 by normalizing the dose-dependent responses of the hybrid devices. Significantly, we could evaluate the potency profiles of both antagonist and agonist of GABAA receptors by analyzing the GABA concentration that produces 50% of maximal response (EC50) in the presence and absence of those drugs. An allosteric agonist reduces the EC50 value by binding to a different site, while a competitive antagonist increases it by binding to the same site as GABA. These results show that this hybrid device can be a powerful tool for the evaluation of various antipsychotic drug candidates binding to GABAA receptors. |
Monday, March 20, 2023 10:36AM - 10:48AM |
EE08.00004: Inkjet printing of flexible interdigitated electrodes using an office inkjet printer for chemi-resistive glucose sensing Rangana M Manamendra, Gimhani C Wickramasinghe, Darshana L Weerawarne A comb-like structure called an interdigitated electrode is the basic building block of a chemi-resistive sensor. The response of the sensor to a chemical is characterized by the electrical resistance measured between the electrodes. Ink-jet printing has been developed as an attractive rapid fabrication technique of interdigitated electrodes. However, such advanced inkjet printers are not readily available for researchers to develop sensing platforms for rapid prototyping. Moreover, the steep learning cycle of such dedicated printers limits the user group. In this regard, the use of an office desktop inkjet printer for fabricating interdigitated electrodes was considered. The interdigitated electrodes were printed on Polyethylene terephthalate (Novele IJ-220 - PET) substrate using EPSON L130 desktop piezoelectric ink tank printer with commercial silver conductive ink (Metalon JS-B25P). A thin film of cuprous oxide nanoparticles was drop-casted onto the electrode and tested for glucose sensing. The evaluation of the performance of the sensor suggested that the technique is an economically viable alternative to the use of high-end dedicated inkjet printers to fabricate sensors for applications including detecting medical parameters and food spoiling. |
Monday, March 20, 2023 10:48AM - 11:00AM |
EE08.00005: Cs3Sb and Ag-O-Cs Semiconductors as Diode Detectors for Low Energy Photon and Charged Particle Detection David R Winn Diode detectors for photons and charged particles (ions, e) and energy measurements use Si, Ge and many others. For very low energy photons, Si(Ge) pair energies Ep=3.6 eV(2.98eV) are to large for many applications, and usually require cooling for low noise. Semiconductor materials used for vacuum photocathodes have much lower Ep: Cs3Sb (S-11)~2eV pair energy; Cs-Ag-O (S-1) averaged pair energy/work function Ep=0.7 eV, and studies have shown that in small patches that the pair energy/work function is a remarkably low Ep = 0.4 eV. We study atomic layer assembly techniques [ALD, MBE, low-temp pulsed-CVD] to make precisely structured Ag-Cs-O to achieve the lowest pair energy, and Cs3Sb for sensors with low energy threshold operating at room temperatures. The Cs3Sb bandgap Eg =1.6 eV is larger than the Eg =1.1. eV of Si, yet with a lower Ep=2 eV. The large Eg of Cs3Sb compared with Si inhibits thermal energy from promoting carriers above the Fermi level, thereby operating with minimal or no cooling for detecting low energy photons or ions. Atomic layer assembly techniques can be used to protect the cesiated materials from air and water vapor with films that are effectively transparent to radiation – single layer graphene is a standard deposited material; 1 layer excludes He. Graphene has been deposited on Cs3Sb photocathodes for protection from air and degradation. |
Monday, March 20, 2023 11:00AM - 11:12AM |
EE08.00006: Reconfigurable bound states in the continuum terahertz metamaterial Yuwei Huang, Kelson Kaj, Chunxu Chen, Zhiwei Yang, Xiaoguang Zhao, Richard D Averitt, Xin Zhang The exotic concept of "bound states in the continuum” (BIC) describes confined waves which do not radiate into the far-field. BICs have been widely investigated due to myriad applications including, as examples, lasers, sensors, and filters. In this work, we demonstrate a thermally tunable Friedrich-Wintgen BIC terahertz split ring resonator (SRR) metamaterials using a micro-electromechanical (MEMS) approach. Tunability is achieved using the difference of the thermal expansion coefficients between gold and silicon nitride layers from which the metamaterials SRR arrays are fabricated. The change of the structure from a quasi-2D structure to a 3D structure results in tuning of the terahertz response from a quasi-BIC state to a near-BIC state. Coupled mode theory (CMT), considering the coupling between the dipole mode and the LC mode inside the SRR structure, is employed to explain the switching response. Our work demonstrates a potential method towards functional terahertz devices through integration of metamaterials with MEMS technology for tunable light-matter interactions. |
Monday, March 20, 2023 11:12AM - 11:24AM |
EE08.00007: Magneto-Optical Sensors: A New Technological Challenge Wibson Wagner Guedes Silva, Adrielson de Araújo Dias, Antônio Augusto Bezerra Sandes Martins, Asnor Ferreira Quirino Silva, Weliton Soares Martins, Sérgio Vladimir Barreiro Degiorgi, Albert Stevens Reyna Ocas, Rafael Alves de Oliveira, José Holanda da Silva Júnior Currently, several phenomena and their applications have been studied in optoelectronics and spintronics, among them are: Kerr-Faraday-Zeeman effects, spin Hall effects, spin Hall magnetoresistance, spin-transfer torque effects, magnetic anisotropy field control, multiferroic properties in complex oxides, spin Seebeck effect, spin Peltier effect, quantum Hall effect, 2D material properties (topological insulators, graphene, etc), plasmonic resonance, dynamic phenomena excited with continuous and pulsed lasers, between others. Among the phenomena that stand out for applications are the effects that present magnetic and optical dependence, the so-called magneto-optical effects. In this work we study magneto-optical interactions in systems with low-dimensionality (few nanometers) and we propose the construction of a magneto-optical sensor, which can encode information using the magneto-optical polarization of the medium. |
Monday, March 20, 2023 11:24AM - 11:36AM |
EE08.00008: Superconducting proximity effect devices Son T Le, Thomas Austin, Jeffrey J Schwartz, Gregory Stephen, Curt A Richter, Christopher J Richardson, Adam L Friedman, Aubrey T Hanbicki Proximitizing superconductors with two-dimensional semiconductors, semimetals, or ferromagnets represents an interesting system for both fundamental research and practical applications. In this work, we report on the fabrication and transport studies of a such system. We utilize ultra-thin (≈ 3 nm to ≈ 9 nm), MBE-grown superconducting aluminum films proximitized with layered materials such as graphene, TaS2, and Co-TaS2. These materials are separated by thin (1 nm to 3 nm) insulating films of Al2O3 or, alternatively, a thin layer (one to three atomic layers thick) of hexagonal boron nitride. Preliminary low-temperature, magneto-transport characteristics of the superconducting Al films and layered materials are studied as well as the transport properties across the junction between the superconductor and layered materials. Understanding the proximity effects that the superconductors have on the layered materials and, vice-versa, the effects that novel layered materials have on the superconductors could result in applications in quantum measurement, sensing, and computation. |
Monday, March 20, 2023 11:36AM - 11:48AM |
EE08.00009: Terahertz cavity Josephson electrodynamics with subwavelength hybrid silicon-high temperature superconductor van der Waals heterostructure arrays Kaveh Delfanazari, Samane Kalhor We propose the engineering of ultrastrong light-matter interactions in a deeply subwavelength microcavity array based on hybrid silicon and high-temperature superconducting (HTS) Bi2Sr2CaCu2O8+δ (BSCCO) van der Waals (vdWs) heterostructure. We perform numerical modelling and analytical calculation to describe Josephson terahertz (THz) cavity electrodynamics and ultrastrong coupling between Josephson plasmon polaritons and subwavelength microcavity arrays. The resonance frequency of microcavities is swept through the Josephson plasma frequency by altering their width. THz reflection demonstrates the anti-crossing behaviour of ultrastrong coupling with a normalized Rabi frequency (coupling strength) 2ΩR/fc = 0.29 for the BSCCO thickness t= 200 nm, which increases to the value of 0.87 for t= 800 nm. |
Monday, March 20, 2023 11:48AM - 12:00PM |
EE08.00010: Cavity engineering of on-chip superconducting oscillators for voltage-tunable coherent mm-waves and terahertz emission with circular polarization YUSHENG XIONG, Samane Kalhor, Siyu Liu, Mingqi Zhang, Richard A Klemm, Takanari Kashiwagi, Kazuo Kadowaki, Kaveh Delfanazari Solid-state, on-chip, integrated, and battery-operated millimetre (mm) waves and terahertz (THz) devices based on high-temperature superconducting BSCCO van der Waals can coherently and continuously radiate electromagnetic waves (EM) with frequencies tunable between 100 GHz and 11 THz. The high power continuous wave (cw) coherent light is observed as a result of quantum tunnelling of electron pairs across the stack of Josephson junctions in the cavity and is tuned by the application of a dc voltage of as small as -1.5 < Vdc (V) < +1.5 through the chip. Here, we present novel approaches towards cavity engineering for the on-chip generation of mm-waves and THz light with circular polarization. We perform numerical simulations/analytical calculations to engineer the cavity geometry and dimensions and compare them with experimental results taken in a cryogenic environment- both at liquid helium and liquid nitrogen temperatures. |
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