Article
Chemistry, Multidisciplinary
Fernando Sanchez, Vicenta Sanchez, Chumin Wang
Summary: In this article, the electron transport and conductance properties of graphene field-effect transistor (GFETs) were investigated using the tight-binding formalism and transfer matrix method. The effect of gate voltage on source-drain current in GFETs was also studied.
Article
Physics, Multidisciplinary
Mengmeng Xi, Rongqian Wang, Jincheng Lu, Jian-Hua Jiang
Summary: The Coulomb interaction between two circuits separated by an insulating layer can result in unconventional thermoelectric effects, including cooling by thermal current effect, transverse thermoelectric effect, and Maxwell's demon effect. This interaction plays a key role in non-local four-terminal thermoelectric transport.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Camilla Bianciardi, Alessia Allevi, Maria Bondani
Summary: This paper presents a method to produce and characterize classical states of light with more than thermal statistics by using two rotating ground-glass disks and appropriately selecting the speckle field produced at the output of each disk. The experimental results are in good agreement with the developed theoretical model, suggesting the potential of this kind of light for imaging applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Multidisciplinary Sciences
Bhaskar Jyoti Borah, Jye-Chang Lee, Han-Hsiung Chi, Yang-Ting Hsiao, Chen-Tung Yen, Chi-Kuang Sun
Summary: The Nyquist-Shannon criterion is difficult to achieve in a laser-scanning mesoscopic multiphoton microscope. By introducing a Nyquist figure-of-merit (NFOM) parameter, researchers have successfully improved the optical resolution retrieval capability of laser-scanning MPMs and achieved high field-of-view-resolution ratios.
Article
Chemistry, Multidisciplinary
Mingfeng Zhang, Zhibo Li, Yuan Jia, Fuquan Wang, Jinpeng Tian, Cuiping Zhang, Tingting Han, Ruiqing Xing, Weixiang Ye, Cheng Wang
Summary: This study reports the molecular-scale capacitance effect of double helical nucleic acid duplex structures for the first time. Through large sample measurements using a high-accuracy graphene transistor biosensor, it is observed that the end-immobilized nucleic acid duplexes can store a portion of ionization electrons, similar to molecular capacitors. A cascaded capacitive network model is proposed to explain this behavior, taking into consideration electron redistribution within the capacitive network. Additionally, it is found that base-pair mismatches hinder charge transport and result in noticeable alterations in electrostatic field effects. The mesoscopic nucleic acid capacitance effect may open up new possibilities for label-free nucleic acid analysis based on electronic transistor devices, enabling in situ and real-time detection of virus biomarkers, somatic mutations, and genome editing off-target effects.
Article
Physics, Multidisciplinary
Wei-Ke Zou, Qing Wang, Hong-Kang Zhao
Summary: The photonic heat current and conductance of a circular mesoscopic Josephson junction device coupled with Majorana fermions under the application of ac magnetic flux have been investigated. The results show that the coupling of Majorana fermions suppresses the amplitude and splits the resonant peaks of heat current. Additionally, the heat conductance is suppressed with increasing the coupling constants of Majorana fermions and increasing the magnitude of the applied ac flux.
Article
Physics, Multidisciplinary
Rongzong Huang, Huiying Wu, Nikolaus A. Adams
Summary: The mesoscopic lattice Boltzmann model for liquid-vapor phase transition is developed by considering microscopic molecular interaction. It incorporates short-range molecular interaction by recovering an equation of state for dense gases, and it mimics long-range molecular interaction by introducing a pairwise interaction force. The model uses double distribution functions for mass and momentum conservation laws and an innovative total kinetic energy distribution function for energy conservation law, ensuring full consistency with kinetic theory and natural thermodynamic consistency.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Amanuel M. Berhane, Christopher G. Baldwin, Keri Liang, Mojtaba Moshkani, Christopher Lustri, James E. Downes, Catherine Stampfl, Richard P. Mildren
Summary: The technique of two-photon etching on diamond surfaces allows controlled removal of atomic layers and nano-patterning, but the mechanism and pattern development are not fully understood. Research has shown that polarization and laser pulse duration have significant impacts on the surface patterns formed, leading to rules for predicting pattern type, roughness, and etch rate.
Article
Optics
Alessia Allevi
Summary: In this study, we utilize the mesoscopic intensity domain to determine the transmittance efficiency of an object by calculating the noise reduction factor. The experimental results suggest that this strategy can be extended to determine a matrix of different transmittance values.
Article
Nanoscience & Nanotechnology
Pei-Chun Yeh, Genki Ohkatsu, Ryo Toyama, Phan Trong Tue, Kostya (Ken) Ostrikov, Yutaka Majima, Wei-Hung Chiang
Summary: The study demonstrates a simple and controlled fabrication method of graphene quantum dot (GQD)-based single-electron transistors (SETs) for photon detectors. The GQD-SETs fabricated enable photon detection with 410 nm excitation due to the photoluminescence emission capability of GQDs.
Article
Optics
Danika R. Luntz-Martin, Dinesh K. Bommidi, Kai Zhang, Andrea D. Pickel, A. N. Vamivakas
Summary: Heat transfer in rarefied gases is a challenging problem, but optically levitated nanoparticles provide an ideal experimental system. By using nanodiamonds to measure temperature, researchers found that as the pressure decreases, the heat transfer to the rarefied gas decreases, leading to an increase in the nanodiamond temperature.
Article
Optics
Danika r. Luntz-martin, Dinesh k. Bommidi, Kai Zhang, Andrea d. Pickel, A. N. Vamivakas
Summary: This study investigates heat transfer in rarefied gases using optically levitated nanoparticles. The experiments demonstrate that as the pressure decreases, heat transfer to the rarefied gas decreases, leading to an increase in the temperature of the nanodiamonds. These findings validate the utility of optically levitated nanoparticles in studying heat transfer at different pressures.
Article
Mechanics
Chenyang Wang, Xiao Wu, Pengfei Hao, Feng He, Xiwen Zhang
Summary: The study introduces a new model to simulate the freezing process of droplets, finding that the temperature of droplets jumps during the recalescence stage and is almost unaffected by external factors. Additionally, the volume and surface properties of droplets affect the solidification time and the final shape of the ice.
Article
Multidisciplinary Sciences
Xindong Song, Yueqi Guo, Hongbo Li, Chenggang Chen, Jong Hoon Lee, Yang Zhang, Zachary Schmidt, Xiaoqin Wang
Summary: This study developed an optical imaging method for mapping cortical functions through the intact skull in marmoset monkeys. Detailed functions and topographies were revealed in visual, auditory, and somatosensory cortices at mesoscopic scales.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Xin Wang, Jingyi Chang, Zhenqian Chen, Bo Xu
Summary: This study models dropwise condensation heat transfer on micropillared surfaces using the 2D multiphase lattice Boltzmann method. The investigation focuses on the dynamic evolution of condensate droplets and heat transfer performance with different surface wettability. The results show that weaker surface wettability leads to a decrease in condensate mass and critical departure radius of droplets.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Physics, Condensed Matter
M. K. Svendsen, C. Wolff, A-P Jauho, N. A. Mortensen, C. Tserkezis
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Materials Science, Multidisciplinary
Patrick R. Whelan, Qian Shen, Binbin Zhou, I. G. Serrano, M. Venkata Kamalakar, David M. A. Mackenzie, Jie Ji, Deping Huang, Haofei Shi, Da Luo, Meihui Wang, Rodney S. Ruoff, Antti-Pekka Jauho, Peter U. Jepsen, Peter Boggild, Jose M. Caridad
Article
Multidisciplinary Sciences
P. A. D. Goncalves, Thomas Christensen, Nuno M. R. Peres, Antti-Pekka Jauho, Itai Epstein, Frank H. L. Koppens, Marin Soljacic, N. Asger Mortensen
Summary: Understanding the quantum response of materials is crucial for designing light-matter interactions at the nanoscale. Graphene plasmons can be utilized to probe the quantum surface-response of metals with subnanometer resolution. This study demonstrates a promising approach for inferring metallic quantum response from measurements by using acoustic graphene plasmons.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Sebastiano Peotta, Fredrik Brange, Aydin Deger, Teemu Ojanen, Christian Flindt
Summary: Dynamical phase transitions extend the concept of criticality to nonstationary settings, involving sudden changes in the macroscopic properties of time-evolving quantum systems. The research combines symmetry, topology, and nonequilibrium physics, utilizing Loschmidt cumulants to determine critical times of interacting many-body systems. Experimental prospects include predicting the first critical time of a quantum many-body system by measuring energy fluctuations in the initial state, with potential implementation on near-term quantum computers with a limited number of qubits.
Article
Chemistry, Multidisciplinary
Alfred J. H. Jones, Lene Gammelgaard, Mikkel O. Sauer, Deepnarayan Biswas, Roland J. Koch, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, Kenji Watanabe, Takashi Taniguchi, Cory R. . Dean, Antti-Pekka Jauho, Peter Boggild, Thomas G. Pedersen, Bjarke S. Jessen, Soren Ulstrup
Summary: This work demonstrates the controllable induction of massive Dirac fermions in a graphene device by lithographically patterning superstructures of nanoscale holes. The band dispersion of these fermions is visualized using angle-resolved photoemission spectroscopy with nanoscale spatial resolution, showing a linear scaling of effective mass with feature sizes. Electrostatic doping enhances the effective hole mass and leads to the observation of an electronic band gap, which is strongly renormalized by carrier-induced screening. This methodology allows for the engineering of band structures of massive Dirac quasiparticles at the nanoscale.
Article
Physics, Multidisciplinary
Moein N. N. Ivaki, Isac Sahlberg, Kim Poyhonen, Teemu Ojanen
Summary: In this study, the concept of topological electronic states is extended to random lattices in non-integer dimensions, and it is found that these topological random fractals exhibit the characteristics of topological insulators.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Rostislav Duda, Moein N. Ivaki, Isac Sahlberg, Kim Poyhonen, Teemu Ojanen
Summary: Discrete-time quantum walks, which are quantum generalizations of classical random walks, have various applications in quantum information processing, quantum algorithms, and quantum simulation. In this study, we investigate the propagation of quantum walks on percolation-generated two-dimensional random lattices. Through large-scale simulations, we observe distinct prediffusive and diffusive behaviors at different timescales. Notably, even weak concentrations of randomly removed lattice sites can completely disrupt the superdiffusive quantum speedup, leading to ordinary diffusion. Increasing the randomness results in the cessation of spreading due to Anderson localization, with the quantum walks exhibiting subdiffusive behavior near the localization threshold. The fragility of quantum speedup poses significant limitations for quantum information applications of quantum walks on random geometries and graphs.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Carlos Ortega-Taberner, Antti-Pekka Jauho, Jens Paaske
Summary: Josephson junction based on quantum dots with local gates offers convenient tunability. In this study, a Josephson junction based on a serial double quantum dot gated by phase-shifted microwave tones is analyzed. The current-phase relation of the junction is modified by the phase shift between the drives. Breaking particle-hole symmetry on the dots results in a finite average anomalous Josephson current with zero phase bias. This microwave gated weak link realizes a tunable Floquet v0 junction with maximum critical current achieved slightly off resonance with the subgap excitation energy.
Article
Physics, Multidisciplinary
Tuomas I. Vanhala, Teemu Ojanen
Summary: This work investigates the theory of the Loschmidt echo and dynamical phase transitions in noninteracting strongly disordered Fermi systems after a quench. In finite systems, the Loschmidt echo exhibits zeros in the complex time plane that form a 2D manifold in the thermodynamic limit and intersect the real axis at a distinct critical time. It is shown that this dynamical phase transition can be understood as a transition in the distribution function of the smallest absolute value of the eigenvalues of the Loschmidt matrix. The concept of dynamical phase transitions in disordered systems is found to be decoupled from the equilibrium Anderson localization transition. The results emphasize the significant qualitative differences in quench dynamics between disordered and nondisordered many-fermion systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Kim Poyhonen, Ali G. Moghaddam, Teemu Ojanen
Summary: We present universal characteristics of quantum entanglement and topology through virtual entanglement modes that fluctuate into existence in subsystem measurements. The measurement-induced modes provide observable routes to entanglement and its scaling laws, and in topological systems, the measurement-induced edge modes offer easily accessible signatures of topology.
PHYSICAL REVIEW RESEARCH
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
P. A. D. Goncalves, T. Christensen, N. M. R. Peres, P. A. Jauho, I Epstein, F. H. L. Koppens, M. Soljacic, N. A. Mortensen
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Physics, Multidisciplinary
Kim Poyhonen, Teemu Ojanen
Summary: This research defines dynamical phase transitions in subsystems embedded in larger quantum systems using entanglement echo, which distinguishes between entanglement-type transitions and bulk-type Loschmidt transitions. An experimental probe is proposed to identify entanglement-type transitions through temporal changes in subsystem fluctuations.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Thomas Aktor, Jose H. Garcia, Stephan Roche, Antti-Pekka Jauho, Stephen R. Power
Summary: This study reports the emergence of bulk, valley-polarized currents in graphene-based devices, driven by spatially varying regions of broken sublattice symmetry, and identified by nonlocal resistance fingerprints. These features are robust against disorder and provide a plausible interpretation of controversial experiments in graphene/hexagonal boron nitride superlattices. The findings suggest an alternative mechanism for the generation of valley Hall effect in graphene and a route towards valley-dependent electron optics through materials and device engineering.
Article
Physics, Multidisciplinary
Yongping Du, Ning Xu, Xianqing Lin, Antti-Pekka Jauho
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Moein N. Ivaki, Sahlberg Isac, Teemu Ojanen
PHYSICAL REVIEW RESEARCH
(2020)
