Article
Chemistry, Physical
Andreas T. Rosch, Robby Reynaerts, Brigitte A. G. Lamers, Kunal S. Mali, Steven De Feyter, Anja R. A. Palmans, E. W. Meijer
Summary: The study presents a novel class of alkylated NDIs for the precise functionalization of HOPG with double lamellar morphologies, showing the unexpected disturbance of odd-even effect in the self-assembled monolayers. The results suggest that increasing the length of the alkyl spacer enhances the conformational freedom of molecules while maintaining a double lamellar morphology.
CHEMISTRY OF MATERIALS
(2021)
Article
Mechanics
Yi Liu, Yu Guo, Bo Yang, Dingyi Pan, Zhenhua Xia, Zhaosheng Yu, Lian-Ping Wang
Summary: The present study improves the understanding of the sedimentation behavior of two flat disks in a viscous fluid through direct numerical simulation and physical experiments. The results show that the shape of the disks, characterized by dimensionless moment of inertia I* and Reynolds number Re, significantly influences the sedimentation processes. The behavior of the disks transitions from steady falling to periodic swinging as Re increases for flatter disks with smaller I*. Disks with larger I* tend to fall in a drafting-kissing-tumbling mode at low Re and remain separated at high Re. A phase diagram is created based on I* and Re to classify the falling behavior into ten distinctive patterns. The planar or three-dimensional motion of the disks is primarily determined by Re, with turbulent disturbance flows contributing to chaotic three-dimensional rotation. The chance of contact between the two disks is increased when I* and Re are reduced.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Physics, Applied
Vl. A. Margulis, E. E. Muryumin
Summary: This article investigates the planar acoustomagnetoelectric (AME) effect in three-dimensional (3D) gapless Dirac materials with a linear dispersion law. The theoretical predictions suggest that this effect can be measured experimentally under certain conditions.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Wei Chen, Sinead M. Griffin, Gian-Marco Rignanese, Geoffroy Hautier
Summary: Investigating vacancy and substitutional defects in monolayer WS2 using hybrid functionals, it is found that there is no unique amount of Fock exchange that satisfies multiple conditions and accurately reproduces the band gap and band edge positions. However, by individually tuning the mixing parameters for the defects and band edges in the GW approximation, excellent agreement with experimental results can be achieved.
Article
Physics, Multidisciplinary
Zhemi Xu, Davide Ferraro, Annamaria Zaltron, Nicola Galvanetto, Alessandro Martucci, Luzhao Sun, Pengfei Yang, Yanfeng Zhang, Yuechen Wang, Zhongfan Liu, Joshua D. Elliott, Margherita Marsili, Luca Dell'Anna, Paolo Umari, Michele Merano
Summary: Through experimental methods, the interference of substrate on the optical response of monolayer two-dimensional crystals has been successfully eliminated, allowing for the accurate determination of both in-plane and out-of-plane optical properties. This precise characterization will be significant for future progress in photonics and optoelectronics research.
COMMUNICATIONS PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Enquan Jin, Keyu Geng, Shuai Fu, Sheng Yang, Narissa Kanlayakan, Matthew A. Addicoat, Nawee Kungwan, Johannes Geurs, Hong Xu, Mischa Bonn, Hai Wang, Jurgen Smet, Tim Kowalczyk, Donglin Jiang
Summary: The study reports a method to develop high-rate n-type semiconductors with exceptional electron mobility. This approach shows promise in enhancing the performance of organic/polymeric semiconductors.
Article
Materials Science, Multidisciplinary
J. P. Santos Pires, S. M. Joao, Aires Ferreira, B. Amorim, J. M. Viana Parente Lopes
Summary: This study analyzes the electronic structure of a cubic T-symmetric Weyl semimetal in the presence of atomic-sized vacancy defects. The results show that isolated vacancies generate nodal bound states with r(-2) asymptotic tails, even in a weakly disordered environment. These states appear as significantly enhanced nodal density of states, which reshape into a nodal peak broadened by intervacancy hybridization into a comb of satellite resonances at finite energies as the concentration of defects increases. This highlights the importance of point defects as a crucial source of elastic scattering that leads to nontrivial modifications in the electronic structure of Weyl semimetals.
Article
Chemistry, Multidisciplinary
Tianyang Chen, Jin-Hu Dou, Luming Yang, Chenyue Sun, Julius J. Oppenheim, Jian Li, Mircea Dinca
Summary: This article presents the construction of Ni-based MOFs and CCPs using 2,3,5,6-tetraamino-1,4-hydroquinone (TAHQ) and its various oxidized forms, resulting in materials with different structural dimensionalities and distinct electronic properties caused by supramolecular interactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Katarzyna Posmyk, Natalia Zawadzka, Mateusz Dyksik, Alessandro Surrente, Duncan K. Maude, Tomasz Kazimierczuk, Adam Babinski, Maciej R. Molas, Watcharaphol Paritmongkol, Miroslaw Maczka, William A. Tisdale, Paulina Plochocka, Michal Baranowski
Summary: This study reveals the exciton fine structure of (PEA)2PbI4 single crystals using low temperature magneto-optical spectroscopy and provides valuable quantification of the fine structure splitting in (PEA)2PbI4. The results support the standard multiband, effective-mass theories for the exciton fine structure in 2D perovskites.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Farhan Rana, Okan Koksal, Minwoo Jung, Gennady Shvets, A. Nick Vamivakas, Christina Manolatou
Summary: This paper presents a many-body theory of exciton-trion polaritons (ETPs) in doped two-dimensional semiconductor materials, discussing the energy band structure and composition of ETPs, as well as the dependence of energy splitting and spectral weights on the strength of Coulomb coupling.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Jian Zhou, Shunhong Zhang
Summary: The study proposes using a terahertz laser to trigger ferroic order switching in two-dimensional multiferroics, enhancing data storage density and read/write speed without damage. Through first-principles calculations, optically induced electronic, phononic, and mechanical responses of two experimentally fabricated multiferroic materials were investigated, showing the effective manipulation of stability in different orientation variants via laser polarization direction. The ultrafast transition kinetics and avoidance of conventional nucleation-growth phase transition processes were also demonstrated.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Xingxiang Chen, Teng Liu, Xianan Qin, Quang Quan Nguyen, Sang Kwon Lee, Chanwoo Lee, Yaguang Ren, Jun Chu, Guang Zhu, Tae-Young Yoon, Chan Young Park, Hyokeun Park
Summary: This study introduces a new microscopy technique for precise three-dimensional localization of two spectrally distinct particles and real-time measurement of their interactions. By observing single-vesicle fusion process, the study reveals nanoscale motion and interactions of individual vesicles.
Article
Chemistry, Physical
Athira T. John, Akshaya Narayanasamy, Deepu George, Mahesh Hariharan
Summary: The unprecedented weak multimodal interactions play a key role in creating novel supramolecular topologies, with halogen-halogen (X...X) interactions offering innovative possibilities for designing multidimensional scaffolds. By utilizing distinct interhalogen interactions, the zipper motifs created can selectively transport electrons along the X...X bonded direction, showing potential for developing advanced functional materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Multidisciplinary
Yao Wang, Zhenzhen Lei, Jinsen Zhang, Xinyong Tao, Chenqiang Hua, Yunhao Lu
Summary: The researchers propose several new phases of tellurium with (anti)ferroelectricity and verify their properties through experiments. This expands the range of elemental ferroelectric materials and sheds new light on their transport phenomena.
CHINESE PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Guangqi Zhang, Gaotian Lu, Xuanzhang Li, Zhen Mei, Liang Liang, Shoushan Fan, Qunqing Li, Yang Wei
Summary: This research uses air-gap barristors to solve the challenges of realizing reconfigurable polarity control and rectification in simplified device structures for ambipolar nanomaterials. By adjusting the air gap around the bottom electrode, the Schottky barrier is widened, blocking the injection of both electrons and holes. The 2D ambipolar channel of WSe2 can be reconfigured as an n- or p-type unipolar transistor and can also function as a switchable diode. By optimizing the electrode materials, the electrical performances can be improved, achieving an on/off ratio of 104 for the transistor and a rectifying ratio of 105 for the diode. Air-gap barristors are used as building blocks to construct a complementary inverter and a switchable AND/OR logic gate, providing an efficient approach for low-dimensional reconfigurable electronics.
Article
Materials Science, Multidisciplinary
S. J. Magorrian, A. J. Graham, N. Yeung, F. Ferreira, P. Nguyen, A. Barinov, V. Fal'ko, N. R. Wilson, N. D. M. Hine
Summary: In this work, the relative alignment and hybridization of bands in van der Waals heterostructures of transition metal dichalcogenides (TMDs) and hexagonal boron nitride (hBN) are studied. By comparing density functional calculations with experimental angle-resolved photoemission spectroscopy (ARPES) results, the hybridization between TMD and hBN valence states and its effects on band crossings are explored.
Article
Physics, Multidisciplinary
Gino Cassella, Halvard Sutterud, Sam Azadi, N. D. Drummond, David Pfau, James S. Spencer, W. M. C. Foulkes
Summary: Deep neural networks, specifically FermiNet, have proven to be highly accurate wave function Ansatze for variational Monte Carlo calculations of molecular ground states. In this study, FermiNet is extended to calculate the ground states of periodic Hamiltonians and is applied to investigate the homogeneous electron gas. The results show excellent agreement with previous quantum Monte Carlo calculations and demonstrate the ability of the neural network to accurately represent different phases of the electron gas.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
James E. E. Nunn, Andrew McEllistrim, Astrid Weston, Aitor Garcia-Ruiz, Matthew D. D. Watson, Marcin Mucha-Kruczynski, Cephise Cacho, Roman V. V. Gorbachev, Vladimir I. I. Fal'ko, Neil R. R. Wilson
Summary: Researchers used angle-resolved photoemission spectroscopy to study the twist-dependent band structure of twisted-graphene layers, validating models and revealing field-induced gaps. However, a discrepancy was found in the gap between the flat band and the next valence band in tDBG, indicating lattice relaxation in this regime.
Article
Multidisciplinary Sciences
Na Xin, James Lourembam, Piranavan Kumaravadivel, A. E. Kazantsev, Zefei Wu, Ciaran Mullan, Julien Barrier, Alexandra A. Geim, I. V. Grigorieva, A. Mishchenko, A. Principi, V. I. Fal'ko, L. A. Ponomarenko, A. K. Geim, Alexey I. Berdyugin
Summary: The most distinctive feature of graphene is its electronic spectrum, in which the Dirac point is located. At low temperatures, the intrinsic behavior of this spectrum is often hidden by charge inhomogeneity, but thermal excitations can overcome the disorder at higher temperatures and create an electron-hole plasma. The behavior of this plasma in magnetic fields is not well understood at present.
Article
Physics, Particles & Fields
Bogdan Ganchev, Daniel R. Mayerson
Summary: Four-dimensional supersymmetric black holes have vanishing multipoles, but finite multipole ratios can be defined through various methods. Bena and Mayerson discovered an agreement between two methods of calculating the multipole ratios, which is attributed to the smallness of the entropy parameter for these black holes. However, a refined conjecture suggests that both the microstate geometry and its corresponding black hole have a property called large dipole, indicating a faraway center of mass.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Laurent Molino, Leena Aggarwal, Vladimir Enaldiev, Ryan Plumadore, Vladimir I. Falko, Adina Luican-Mayer
Summary: This study demonstrates the local control of ferroelectric domains in marginally twisted WS2 bilayers using a scanning tunneling microscope at room temperature, and explains their reversible evolution using a string-like model of the domain wall network. The results show the possibility of achieving full control over atomically thin semiconducting ferroelectric domains using local electric fields, which is a critical step towards their technological use.
ADVANCED MATERIALS
(2023)
Article
Physics, Particles & Fields
Bogdan Ganchev, Stefano Giusto, Anthony Houppe, Rodolfo Russo, Nicholas P. Warner
Summary: In this paper, we construct a class of solutions called microstrata using perturbation theory and numerical methods. Microstrata are the non-extremal counterparts of superstrata, which are smooth, non-extremal solitonic solutions to IIB supergravity that approximate black holes. By studying the holographic correspondence between microstrata and the D1-D5 CFT, we find that microstrata correspond to multi-particle states in the D1-D5 CFT involving a large number of mutually non-BPS supergravitons, and the anomalous dimensions of these states can be determined from the binding energies in supergravity.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Multidisciplinary
Evgenii E. Vdovin, Mark T. Greenaway, Yurii N. Khanin, Sergey V. Morozov, Oleg Makarovsky, Amalia Patane, Artem Mishchenko, Sergey Slizovskiy, Vladimir I. Fal'ko, Andre K. Geim, Kostya S. Novoselov, Laurence Eaves
Summary: Insights into the fundamental properties of graphene's Dirac-Weyl fermions have been gained through studying electron tunnelling transistors with an atomically thin layer of hexagonal boron nitride (hBN) sandwiched between two layers of high purity graphene. With the presence of a single defect within the hBN tunnel barrier, electrons can be injected into the graphene layers, and its well-defined energy level acts as a high resolution spectroscopic probe of electron-electron interactions in graphene. We observe a magnetic field dependent suppression of the tunnel current flowing through a single defect below temperatures of about 2 K, attributed to the formation of a magnetically-induced Coulomb gap in the spectral density of electrons tunnelling into graphene due to electron-electron interactions.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Andrew McEllistrim, Aitor Garcia-Ruiz, Zachary A. H. Goodwin, Vladimir I. Fal'ko
Summary: Tetralayer graphene, a new member of few-layer graphenes, demonstrates versatile electronic properties. Spectroscopic characteristics, such as angle-resolved photoemission spectroscopy, dynamical optical conductivity, and Raman spectra, can be used to identify the stacking order of tetralayer graphene films in a noninvasive manner.
Article
Materials Science, Multidisciplinary
Christian Moulsdale, Vladimir Fal'ko
Summary: Recent experimental progress has shown the observation of ballistic electron transport in moire superlattices in graphene and hBN heterostructures. In this study, we predict that a high-quality graphene bilayer on an hBN substrate exhibits a T2-dependent resistivity due to umklapp electron-electron scattering from the moire superlattice. The resistivity shows a rapid and nonmonotonic dependence on hole density, suggesting potential applications in unconventional field-effect transistor operations. We also analyze the influence of interlayer asymmetry and trigonal warping on the electron-electron umklapp scattering.
Article
Materials Science, Multidisciplinary
Ankush Girdhar, Vinod Ashokan, Rajesh O. Sharma, N. D. Drummond, K. N. Pathak
Summary: We use the variational quantum Monte Carlo (VMC) method to study the dependence of ground-state properties of quasi-one-dimensional paramagnetic electron fluids on wire-width (b) and electron-density (rs). The crossover of the dominant peak in the static structure factor from k = 2kF to k = 4kF is investigated, and it is found that the crossover occurs as the wire width decreases for a fixed electron density. The study suggests that the crossover is due to the interplay of both rs and b < rs. The wire-width correlation effect is reflected in the peak height of the charge and spin structure factors, and the wire-width dependence of the electron correlation energy and the Tomonaga-Luttinger parameter K rho is significant.
Article
Chemistry, Multidisciplinary
Laurent Molino, Leena Aggarwal, Vladimir Enaldiev, Ryan Plumadore, Vladimir I. Falko, Adina Luican-Mayer
Summary: This study demonstrates the local control of ferroelectric domains in a marginally twisted WS2 bilayer using a scanning tunneling microscope at room temperature, and the reversible evolution of these domains is explained using a string-like model of the domain wall network. The results show that it is possible to achieve full control over atomically thin semiconducting ferroelectric domains using local electric fields, which is critical for technological applications.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sam Azadi, N. D. Drummond
Summary: In this study, variational and diffusion quantum Monte Carlo methods were used to investigate the zero-temperature phase diagram of the three-dimensional homogeneous electron gas at very low density. The results show a first-order quantum phase transition from a paramagnetic fluid to a body-centered cubic crystal at a certain density.
Article
Materials Science, Multidisciplinary
D. M. Thomas, Y. Asiri, N. D. Drummond
Summary: Density functional theory (DFT) is commonly used to study defects in monolayer graphene. However, it underestimates the formation energies of monovacancies. Vibrational effects play a significant role in the formation free energies of these defects. Bulk silicon is more stable than monolayer silicene.
Article
Materials Science, Multidisciplinary
Ankush Girdhar, Vinod Ashokan, N. D. Drummond, Klaus Morawetz, K. N. Pathak
Summary: The ground-state properties of ferromagnetic quasi-one-dimensional quantum wires at high density were studied using the quantum Monte Carlo method. It was observed that the peak in the static structure factor grows as the wire width decreases. The Tomonaga-Luttinger liquid parameter K-rho was obtained from the momentum density, with an increase of about 10% between different wire widths. The first-order random phase approximation (RPA) was used to examine the ground-state properties of finite-thickness wires, showing variations in correlation energy depending on the wire model. Comparisons were made with numerical evaluations for several values of wire widths and density parameters.
