Article
Chemistry, Multidisciplinary
Zhi Li, Rui Wang, Yunpeng Li, Yingjie Li, Chaoqi Ma, Jiawei Yang, Hongxiang Li
Summary: The charge transport of 1,4,5,8-naphthalene diimide (NDI)-based molecules is reversibly tuned by bias voltage and solvent, providing potential for the development of functional molecular devices.
CHEMICAL COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Ahmet Demir, Neal Staley, Samuel Aronson, Spencer Tomarken, Ken West, Kirk Baldwin, Loren Pfeiffer, Raymond Ashoori
Summary: This research utilized laterally large and low-disorder GaAs quantum-well-based quantum dots to study tunneling of single electrons, identifying single-electron capacitance peaks in the addition spectrum. Two remarkable phenomena were observed in the Landau level filling factor range of nu = 2 to nu = 5: Coulomb blockade peaks due to the entrance of two electrons instead of one, and uniform appearance of double-height peaks at and near nu = 5/2 with a magnetic field flux periodicity of h/2e.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Tingwei Gao, Chunhui He, Chenguang Liu, Yinqi Fan, Cezhou Zhao, Chun Zhao, Weitao Su, Yannick J. Dappe, Li Yang
Summary: The use of graphene as a new type of electrode at molecular junctions has led to enhanced conductance for longer molecules. Studies involving oligopthiophene based hybrid gold-graphene junctions show similar behavior to alkane-based junctions, as supported by experiments and DFT calculations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yinqi Fan, Shuhui Tao, Sylvain Pitie, Chenguang Liu, Chun Zhao, Mahamadou Seydou, Yannick J. Dappe, Paul J. Low, Richard J. Nichols, Li Yang
Summary: This article discusses the significance of quantum interference on molecular conductance and elucidates the impact of different electrode materials and anchor groups on molecular conductance.
Article
Crystallography
Abel Garcia-Barrientos, Natalia Nikolova, Lado Filipovic, Edmundo A. Gutierrez-D, Victoria Serrano, Sharon Macias-Velasquez, Sarai Zarate-Galvez
Summary: This paper presents a 2D numerical simulation of space charge wave amplification using negative differential conductance in MOS silicon-germanium-based field-effect transistors and CMOS technology. The results show the amplification and non-linear interaction of space charge waves in a strained Si/SiGe heterostructure, with a frequency of up to 47 GHz at 4.2K.
Article
Materials Science, Multidisciplinary
David M. Long, Philip J. D. Crowley, Anushya Chandran
Summary: Quasiperiodically driven fermionic systems can exhibit topological phases with localized fermions in the bulk and quantized energy currents at the edge, as observed in the phase diagram for (1 + 2) dimensions showing distinct topological and trivial phases separated by a phase transition.
Article
Materials Science, Multidisciplinary
A. A. Lasek, C. H. W. Barnes, T. Ferrus
Summary: We successfully demonstrate the isolation and electrostatic control of a single phosphorus donor in a silicon quantum dot. Experimental observations and simulations support the existence of isolated dopants and their use as charge detectors.
Article
Chemistry, Multidisciplinary
Zahra Barani, Tekwam Geremew, Megan Stokey, Nicholas Sesing, Maedeh Taheri, Matthew J. Hilfiker, Fariborz Kargar, Mathias Schubert, Tina T. Salguero, Alexander A. Balandin
Summary: This study demonstrates a unique class of quantum composites based on polymers with fillers composed of a van der Waals quantum material. These composites reveal multiple charge-density-wave quantum condensate phases. Typically, materials exhibiting quantum phenomena are crystalline, pure, and have few defects. However, in this research, the macroscopic charge-density-wave phases of the filler particles are successfully preserved even after multiple composite processing steps. The prepared composites display strong charge-density-wave phenomena at temperatures even above room temperature and show potential for advanced applications in energy storage and electronics.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Woojung Lee, Shayan Louie, Austin M. Evans, Nicholas M. Orchanian, Ilana B. Stone, Boyuan Zhang, Yujing Wei, Xavier Roy, Colin Nuckolls, Latha Venkataraman
Summary: This study demonstrates that dynamic molecular structures lead to temperature-dependent conductance in molecular wires. Thermally activated dihedral rotations increase the probability of molecular wires being in a planar conformation, enhancing tunneling probability. Longer molecular wires with more rotational pivot points exhibit larger temperature dependence on conductance.
Article
Chemistry, Multidisciplinary
Shantanu Mishra, Xuelin Yao, Qiang Chen, Kristjan Eimre, Oliver Groening, Ricardo Ortiz, Marco Di Giovannantonio, Juan Carlos Sancho-Garcia, Joaquin Fernandez-Rossier, Carlo A. Pignedoli, Klaus Muellen, Pascal Ruffieux, Akimitsu Narita, Roman Fasel
Summary: Nanographenes with zigzag edges are predicted to exhibit non-trivial pi-magnetism, but their magnetic stability has been limited by weak exchange coupling. Recent synthesis of two large rhombus-shaped nanographenes on gold and copper surfaces shows a significant magnetic exchange coupling.
Article
Nanoscience & Nanotechnology
Xing-Wei Chen, Guang-Yu Yi, Lian-Lian Zhang, Wei-Bin Cui, Wei-Jiang Gong
Summary: The theoretical investigation of the Kondo effect in the T-shaped double-quantum-dot structure shows that a two-stage Kondo effect can be induced when the quantum dot levels are shifted to the electron-hole symmetry point. However, increasing interdot coupling can efficiently modify the Kondo effect, leading to the destruction of the conductance plateau. Detuning the dot levels can result in new low-temperature entropy transitions and complex transport behaviors due to the competition between the Kondo effect and the interdot antiferromagnetic correlation.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Physical
Goutam Ghosh, Kritiman Marjit, Srijon Ghosh, Amitava Patra
Summary: We investigate the fast hot-carrier (HC) relaxation and Auger recombination (AR) rates in hexapod CsPbBr3 NCs using ultrafast transient absorption (TA) spectroscopy. Our results show that hexapod CsPbBr3 has a prolonged HC cooling time and bi-exciton lifetime compared to cubic CsPbBr3. By employing the electron-phonon coupling model, we confirm the slower HC relaxation rate in hexapod CsPbBr3, suggesting a delayed decay of longitudinal optical (LO) phonons. We demonstrate that delocalization of charge carriers in shallow trap states leads to reduced overlap of electron and hole wave functions and suppresses the bi-exciton AR rate.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Honglian Chen, Songjun Hou, Qingqing Wu, Feng Jiang, Ping Zhou, Long Zhang, Yang Jiao, Bo Song, Qing-Hu Guo, Xiao-Yang Chen, Wenjing Hong, Colin J. Lambert, J. Fraser Stoddart
Summary: Single-molecule electronics focuses on studying the flow of electricity through devices made of single molecules, with the control of current flow being influenced by quantum interference. Research has shown that in tetracationic cyclophane circuits, electron transport is mediated by quantum interference between two lowest unoccupied molecular orbitals, resulting in either constructive or destructive interference and impacting overall conductivity. This design allows for the construction of single-molecule conductors and insulators based on a single cyclophane platform.
Article
Chemistry, Inorganic & Nuclear
Shi-Nuo Xu, Yan Zheng, Jing-Yao Ye, Zhong-Yang Chen, Jian-Feng Yan, Yan-Hou Geng, Wenjing Hong, Yao-Feng Yuan
Summary: Here, we present the synthesis, structure, and single-molecule conductance of three o-carborane-based molecular wires with multiple conduction channels. Through experimental and theoretical studies, we found that o-carborane-based wires have a unique three-dimensional structure that facilitates through-space transmission paths and stable molecular junction formation compared to phenyl-centered wires. The significant difference in conductance is attributed to the combination of multiple conduction channels and quantum interference. Understanding the impact of different bridging groups and anchor group substitution patterns provides valuable insights for designing multichannel molecular wires based on o-carboranes.
DALTON TRANSACTIONS
(2023)
Article
Astronomy & Astrophysics
M. Sieyra, S. Krishna Prasad, G. Stenborg, E. Khomenko, T. Van Doorsselaere, A. Costa, A. Esquivel, J. M. Riedl
Summary: The aim of this study is to understand the effect of projection on observed speeds by comparing them with those from a numerical model. The analysis of multi-wavelength data reveals a dominant period of 2-3 minutes for intensity disturbances at different heights of the atmosphere. Both observed propagation speeds and those calculated from the synthetic model exhibit an accelerated pattern.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Physics, Condensed Matter
Tomasz Kwapinski, Ryszard Taranko
EUROPEAN PHYSICAL JOURNAL B
(2015)
Article
Nanoscience & Nanotechnology
R. Taranko, T. Kwapinski
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2015)
Article
Physics, Condensed Matter
M. Jalochowski, T. Kwapinski, P. Lukasik, P. Nita, M. Kopciuszynski
JOURNAL OF PHYSICS-CONDENSED MATTER
(2016)
Article
Physics, Condensed Matter
Tomasz Kwapinski
JOURNAL OF PHYSICS-CONDENSED MATTER
(2017)
Article
Physics, Applied
Marcin Kurzyna, Tomasz Kwapinski
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Nanoscience & Nanotechnology
T. Kwapinski, R. Taranko
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2014)
Article
Physics, Applied
Marcin Kurzyna, Tomasz Kwapinski
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
Marcin Kurzyna, Tomasz Kwapinski
Summary: This paper investigates electron pumping through energy-gapped systems and electron transport properties of a topological Su-Schrieffer-Heeger chain. The results show that the topologically trivial chain performs better in charge pumping than other normal or nontrivial chains. Additionally, during the perturbation process, electrons are pumped through temporary mid-gap states or induced sideband states.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Tomasz Kwapinski, Marcin Kurzyna
Summary: Investigating mid-gap 1D topological states and their electronic properties on different 2D hybrid structures reveals that these structures substantially influence topological states and induce strong asymmetry in their energy structures. Additionally, topological edge states can appear at different energies near the surface DOS edges.
Article
Computer Science, Software Engineering
Marcin Kurzyna, Tomasz Kwapinski
Summary: This article proposes a new method of three-dimensional data plotting using mixed hue palettes, which allows for the distinction of both large and subtle changes in the value of the presented quantity. The method, called braid plot, uses alternating palettes of colors to increase graph sharpness and accurately define areas of equal values. By using this plot type, weak perturbation effects or subtle oscillations that are difficult to observe using classical plots can be detected.
IEEE COMPUTER GRAPHICS AND APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
T. Kwapinski
Summary: This study investigates a phase of solid state matter existing in the time dimension on a linear chain of quantum dots or atomic sites using the evolution operator technique and the Laplace transform technique. The focus is on the spectral density of states (DOS) function and its modifications after a sudden change in the system. The results show that this function exhibits a regular oscillating structure in time, corresponding to the stationary DOS of one-dimensional crystals. Therefore, this system represents a transient crystal material that exists in the time dimension for a short period and then suddenly disappears. Additionally, different impulse propagation velocities are observed due to the local DOS inertia, making it more difficult to rebuild a multi-peaked DOS structure associated with longer chains. Furthermore, the transient crystal pattern in a linear chain can be observed in real electrodes characterized by van Hove singularities or a flat spectral density.
Article
Materials Science, Multidisciplinary
M. Kurzyna, T. Kwapinski
Article
Materials Science, Multidisciplinary
M. Kurzyna, T. Kwapinski
Article
Materials Science, Multidisciplinary
R. Taranko, T. Kwapinski, T. Domanski
Article
Physics, Multidisciplinary
Z. Korczak, T. Kwapinski
ACTA PHYSICA POLONICA A
(2018)
