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 W21: Non-carbon Nanostructures |
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Sponsoring Units: DCMP Chair: Serkan Caliskan, University of Houston - Clear Lake Room: Room 213 |
Thursday, March 9, 2023 3:00PM - 3:12PM |
W21.00001: Electrostatic coupling of double layer self assembled quantum dots Lukas Berg, Laurin Schnorr, Thomas Heinzel, Arne Ludwig, Andreas D Wieck
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Thursday, March 9, 2023 3:12PM - 3:24PM |
W21.00002: Gated quantum structures in monolayer WSe2 Justin Boddison-Chouinard, Alexander M Bogan, Norman Fong, Pedro Barios, Jean Lapointe, Kenji Watanabe, Takashi Taniguchi, Jaroslaw Pawlowski, Daniel Miravet, Maciej Bieniek, Pawel Hawrylak, Adina A Luican-Mayer, Louis Gaudreau The family of semiconducting 2H-phase group-VI transition metal dichalcogenides (TMDs) have been suggested to be promising candidates for the development of quantum devices due to their desirable optical and electrical properties. In this talk, we present our work based on gated quantum structures fabricated in encapsulated monolayer tungsten diselenide (WSe2) with the goal of furthering our understanding of the material and of fabricating functional devices for quantum technologies. More specifically, we concentrate on three important gated quantum structures: quantum dots, a charge detector, and a long one-dimensional channel. |
Thursday, March 9, 2023 3:24PM - 3:36PM |
W21.00003: Influence of Transition Metals on Mechanical and Electronic Structure Properties of Boron Nitride Nanotubes Serkan Caliskan First principles calculations are implemented on doped boron nitride nanotubes (BNNTs) to exhibit their mechanical and spin dependent electronic characteristics. BNNTs are doped with transition metals to bring about spin polarization and adjust their band gaps. The numerical results are elucidated by means of spin resolved spectra, magnetic moment, charge transfer and conductance. It is demonstrated that dopants and/or defects can be employed to manipulate magnetic properties, which can induce a half metallic property. A discussion is presented regarding how they can be harnessed as building blocks for the prospective devices in the field of spintronics. |
Thursday, March 9, 2023 3:36PM - 3:48PM |
W21.00004: Atomistic simulation of hot carrier generation in large plasmonic nanoparticles Simão M João Energetic or “hot” carriers in metallic nanoparticles are generated from the decay of the localized surface plasmon via the Landau damping mechanism and can be harnessed for applications in photocatalysis or sensing. A detailed understanding of hot-carrier properties and their dependence on the nanoparticle size, composition, environment and shape is needed to optimize devices. However, standard electronic structure methods, such as those based on first-principles density-functional theory [1], cannot be applied to nanoparticles of experimentally relevant sizes. To address this challenge, we use a recently developed approach that combines an atomistic tight- binding description of the nanoparticles with a Chebyshev decomposition of Fermi's golden rule [2] in order to calculate the rate of hot carrier generation. This opens up the possibility of simulating nanoparticles with millions of atoms. We will present results for hot-carrier generation rates of gold nanoparticles of different shapes including cubes, octahedra and dodecahedra and discuss their potential for the photocatalytic reduction of CO2 into high-value chemicals. |
Thursday, March 9, 2023 3:48PM - 4:00PM |
W21.00005: Synthesis of ultralong Ta2Ni3Se8 van der Waals nanowires for transistor devices Abin Joshy, Nirasha Thilakaratne, Fei Wang, Jiang Wei One-dimensional (1D) van der Waals (vdW) nanowires can achieve maximal miniaturization while keeping intrinsic characteristics for device applications. Innovative synthesis techniques are required to manufacture nanowires of macroscopic length that are of good quality. We present the high yield production of single-crystal Ta2Ni3Se8 (TNS) nanowires with a length of several millimeters using a solid-state reaction growth. High resolution TEM studies demonstrate that nanowires are made up of parallelly organized molecular chains and lack surface amorphous oxide layers. The as-grown TNS wires can be mechanically exfoliated into nanowires with tens of nanometers or less thickness. AFM topography studies demonstrated that exfoliated wires had a consistent thickness. In addition, we show that many electrical devices can be constructed on a single TNS nanowire. Our investigations of electrical transport have revealed that these thin wires are gatable and exhibit n-type semiconducting characteristics. The 1D transistors that were created have excellent switching capability, which makes TNS a strong contender for low-dimensional electronics. This research could pave the way for the creation of novel 1D vdW nanowires for use in electronics and sensors of the next generation. |
Thursday, March 9, 2023 4:00PM - 4:12PM |
W21.00006: Determining the Structure of One-Dimensional Lepidocrocite TiO2 Nanoribbons with Atomic Resolution Scanning Transmission Electron Microscopy Francisco J Lagunas Vargas, Hussein O Badr, Emilio Ferral, Michel Barsoum, Robert F Klie One-dimensional (1D) materials are of interest because they offer high specific surface areas and host a variety of quantum size effects. Recently, Badr et al. reported on the synthesis of micron sized two-dimensional titanium carbo-oxide flakes composed of nanofilaments using a scalable process starting with inexpensive, abundant, nontoxic Ti-containing compounds like TiC and TiB2 amongst many more. Band gap energy measurements suggest these nanofilaments are 1D in nature however, despite a variety of characterizations, questions remained concerning their chemical composition and atomic structures. |
Thursday, March 9, 2023 4:12PM - 4:24PM |
W21.00007: Probing Disorder-Sensitive Physics in InSb Nanowires with a van der Waals Material-Based Device Platform Colin J Riggert, Tyler Littmann, Gavin Menning, Pim Lueb, Ghada Badawy, Marco Rossi, Lior Shani, Erik P. A. M. Bakkers, Paul A Crowell, Vlad S Pribiag InSb nanowires have attracted great interest in the last decade, as their large g-factor and strong spin orbit coupling enables applications in both spin transport and topological superconductivity. However, the key physics underlying this utility - the so-called "helical liquid" state - is sensitive to disorder in both the wire and its surrounding environment, and attempts at observation of such a helical liquid have so far been inconclusive. The replacement of traditional device elements, such as a thermal oxide dielectric and normal metal gate, with 2D van der Waals (vdW) materials has shown success in revealing disorder-sensitive physics in materials ranging from graphene to vdW topological insulators. Taking inspiration from this, we report on our progress in developing an optimized vdW based platform for probing helical liquid physics in ultrathin InSb nanowires. |
Thursday, March 9, 2023 4:24PM - 4:36PM |
W21.00008: Transport Measurements using Hall Cross Geometry to probe Electronic States of Graphene Nanoribbons Juliana Sebolt, Muqing Yu, Chang-Beom Eom, Patrick R Irvin, Jeremy Levy, Ahmed Omran, Kyoungjun Lee Graphene nanoribbons (GNRs) have unique electronic properties that can potentially be used to develop electron spin-based qubits. The LaAlO3/SrTiO3 (LAO/STO) correlated nanoelectronics platform [1] enables single GNRs to be addressed both optically and electrically. Here we use a LAO/STO-based sketched single electron transistor (SketchSET) [2] to probe the energies at which a single electron is added to a GNR. This addition energy spectrum [3] is expected to be influenced by local electric fields from proximal sketched gates as well as global magnetic fields which can Zeeman split the energy states. The nanocross geometry has shown to probe the LAO/STO electron system and be highly reproducible [4]. A nanocross device over a GNR has the potential to measure spin polarization in a magnetic field. This information is complementary to other probes, e.g., THz spectroscopy [5] and STM which also provide detailed information about the electronic structures of these GNR-based spin qubit candidates. |
Thursday, March 9, 2023 4:36PM - 4:48PM |
W21.00009: Hybrid metal/semiconductor quantum dots for analog quantum simulation of non-Fermi liquid physics Praveen Sriram, Connie L Hsueh, Tiantian Wang, Candice Thomas, Geoffrey C Gardner, Marc A Kastner, Michael J Manfra, David Goldhaber-Gordon Few-site semiconductor quantum dot arrays have provided controllable realizations of effective Hamiltonians. However, intersite inhomogeneity presents a major roadblock to scaling and tuning larger arrays. In contrast, the quasi-continuous level spectrum of hybrid metal-semiconductor quantum dots enables the design of arrays of such sites that behave essentially identically while retaining tunability of intersite coupling, providing a platform for simulating strong interactions. Recent work on a pair of hybrid metal/GaAs dots investigated a novel non-Fermi liquid critical point based on Kondo interactions mediated by the charge of the metallic island[1]. The islands had to be a few microns wide, given how ohmic contacts are made to GaAs. The surface Fermi level pinning in InAs provides a pathway for designing submicron hybrid dots with larger charging energy, enabling investigations of critical scaling over a broader temperature range. We have demonstrated the essential ingredients in an InAs quantum well – clean quantum point contacts[2], highly transparent transmission (>99%) of 1D modes into submicron metal islands, and hybrid metal/InAs dots – for building sizable arrays to gain insights into the Kondo lattice coherence in heavy-fermion materials. |
Thursday, March 9, 2023 4:48PM - 5:00PM |
W21.00010: Strongly correlated zero-bias anomaly in double quantum dot measurements Rachel Wortis, Joshua Folk, Silvia Luescher, Sylvia M Luyben Experiments in doped transition metal oxides often show suppression in the single-particle density of states at the Fermi level, but disorder-induced zero-bias anomalies in strongly correlated systems remain poorly understood. Numerical studies of the Anderson-Hubbard model have identified a zero-bias anomaly that is unique to strongly correlated materials, with a width proportional to the intersite hopping amplitude t [PRL 101, 086401 (2008)]. In ensembles of two-site systems, a zero-bias anomaly with the same parameter dependence also occurs, suggesting a similar physical origin [PRB 82, 073107 (2010)]. We describe how this kinetic-energy-driven zero-bias anomaly in ensembles of two-site systems may be seen in a mesoscopic realization based on double quantum dots. Moreover, the double-quantum-dot measurements provide access not only to the ensemble-average density of states but also to the details of the transitions which give rise to the zero-bias anomaly.
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Thursday, March 9, 2023 5:00PM - 5:12PM |
W21.00011: Control of localization in the non-Hermitian system Junmo Jeon, SungBin Lee Non-Hermitian systems get lots of attention for studying open and dissipative quantum systems and their novel properties and applications in optics and condensed matter physics. One of the remarkable effects lies in the non-Hermitian skin effect which is the anomalous condensation of the bulk states at the edge resulting from non-reciprocal hopping magnitudes. From both theoretical and experimental points of view, it has been explored based on the Hatano-Nelson argument and topological exceptional points. |
Thursday, March 9, 2023 5:12PM - 5:24PM |
W21.00012: Single molecule optomechanical resonators with suspended DNA strings Arnab Manna, Michael Skripalsh, Laurel E Anderson, Arka Majumdar, Arthur W Barnard The well-defined vibrational characteristics of microelectromechanical (MEMS) resonators have made them a powerful yet simple tool for sensing. Nanoscale and molecular structure exist in a much more complex regime. Biopolymers such as DNA are known to be highly entropic, exhibiting large thermal fluctuations among their many flexural modes. While the impact of these interactions is well-understood in highly-damped environments, how they affect under-damped single-molecule resonant strings is largely unexplored. Additionally, it is possible to rationally design complex structures involving controlled defects like stacking faults or hair-pins to localize masses and kinks into DNA strands using DNA origami. Understanding and controlling molecular phononic systems will help clarify important questions related to decoherence and may inspire a new class of integrated sensors. Here we report our progress in deterministic sub-micron interfacing of suspended DNA strings with nanoscale photonic crystal cavity to show broadband, real-time detection of their thermal fluctuations. We discuss the merits and challenges of performing these optoelectromechanical measurements in vacuum and cryogenic environments. |
Thursday, March 9, 2023 5:24PM - 5:36PM |
W21.00013: Topological Defects and Ferroelastic Twins in Ferroelectric Nanocrystals using Coherent X-Rays Xiaowen Shi, Edwin Fohtung Xiaowen Shi1 and Edwin Fohtung 1* |
Thursday, March 9, 2023 5:36PM - 5:48PM |
W21.00014: Laser beam retention in the vibratory dipoles of silica glass surfaces. Cristian Bahrim, Rishi Bharadwaj We report experimental results for the suppression of a weak TEMoo probe cw-laser beam due to a brighter coupling laser. Our studies include a low coherent regime, when two TEMoo cw-laser beams of 650nm (weak probe) and 532nm (brighter coupler) are irradiating the same crown glass surface. At about 59 degrees measured from the normal of the dielectric surface, our experimental reflectance of the probe laser beam shows a deep minimum that can be interpreted as being the signature of the suppression of a probe laser beam due to a brighter coupling laser. In our case, the interaction between the lasers is assisted by an isotropic energy background from a capacitor voltage set across the dielectric. For voltages lower than 0.3 volts, a weak interference pattern with evenly spaced fringes on the right wing of the signal is observed. For voltages larger than 3 volts, the coherent interference of the two lasers is diminished because of a larger energy background. Further, we looked to a highly coherent regime, with two TEMoo diode cw-lasers of 532 nm irradiating the same 2mm spot on a crown glass surface. A nicely resolved interference pattern is now shown in the parallel component of the reflectance at five capacitor voltages: 0, 0.3, 0.6, 3.0 and 6.0 volts. At voltages lower than 0.3 volts, we observe a clear and regular interference pattern with 0.6 degrees between adjacent maxima and minima. For voltages greater than 0.6 volts, the interference pattern changes as the voltage increases into an uneven distribution of maxima-minima, as well as a strong attenuation of the amplitudes is observed. This fact is interpreted as being due to a larger energy background that diminishes the coherence between the lasers. |
Thursday, March 9, 2023 5:48PM - 6:00PM |
W21.00015: Fabrication of Nanostructures for Development of Diffractive Optics Leslie Howe, Ho X Vinh, John Leckey, David G Macdonnell, Hyun J Kim, Tharindu Damesha, Vinh Q Nguyen Diffractive optical lenses are anticipated as revolutionary optical elements that provide high-resolution, lightweight, high-efficiency, high-contrast focusing optics for applications in astronomy, free-space optical communications, spectroscopy, defense and remote sensing. However, the reported transmission efficiency is low, and the fabrication of nanostructures is challenging for large diffractive optics. To overcome these issues, we have performed Monte Carlo Ray-Trace diffraction simulations and fabricated several types of diffractive lenses including photon sieves, Fresnel zone plates, and multi-level Fresnel zone plates using nanofabrication techniques. These lenses show a strong correlation with the simulated expectations for their performance in their transmitted intensity and resolution. The results represent a new step in high-resolution diffractive optics with high focusing efficiency suitable for widespread applications. |
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