Article
Chemistry, Inorganic & Nuclear
Qiong Xia, Qi Xu, Bin Xu, Lin Yi
Summary: The study found that monolayer BiSbTe3 has good dynamic stability and low lattice thermal conductivity, with p-type doping showing better results than n-type doping. TB-mBJ can reduce the electronic thermal conductivity effectively.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Physical
Donglin Guo, Hongli Zhang, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Dengming Chen, Yilong Ma, Jianchun Sun
Summary: The study shows that by reducing the phonon thermal conductivity, enhancing the electronic performance, and considering various mean free paths, the thermoelectric properties of PbTe can be effectively improved. The contribution to electrical transport mainly comes from mean free path scattering, while thermal transport is mainly influenced by phonon scattering. Significant enhancement in the ZT value for p-type is observed when the hole/photon mean free path is 10 nm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Kohei Kawabata, Masahito Ueda
Summary: The Landauer formula has been extended to the nonlinear-response regime, revealing that the nonlinear conductance is given by derivatives with respect to energy. This sensitivity to energy derivatives produces unique nonlinear transport phenomena in mesoscopic systems, such as disordered and topological materials. The study also explores the nonlinear conductance of disordered chains and the critical behavior of nonlinear response near mobility edges, as well as the nonlinear response of graphene and the scattering theory of the nonlinear Hall effect.
Review
Chemistry, Inorganic & Nuclear
Lasse Rabol Jorgensen, Bo Brummerstedt Iversen
Summary: The researchers proposed three overall levels of stability testing to encourage more elaborate stability studies, and introduced a reporting protocol to streamline experimental information for more reliable comparison of results.
DALTON TRANSACTIONS
(2022)
Article
Physics, Multidisciplinary
Alois Wuerger
Summary: The huge Seebeck coefficients observed recently for ionic conductors are shown to arise from a ratchet effect where activated jumps between neighbor sites are rectified by a temperature gradient, thus driving mobile ions toward the cold. For complex systems with mobile molecules like water or polyethylene glycol, there is an even more efficient diffusiophoretic transport mechanism, proportional to the thermally induced concentration gradient of the molecular component. Without free parameters, the model describes experiments on the ionic liquid EMIM-TFSI and hydrated NaPSS, and qualitatively accounts for polymer electrolyte membranes with Seebeck coefficients of hundreds of k(B)/e.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Hua Dai, Bin Xu
Summary: The thermoelectric properties of Sb2TeSeS materials were investigated using calculations and theoretical analysis. The results showed that the monolayer structure of Sb2TeSeS exhibits low thermal conductivity and high figure of merit value, making it a potential candidate for thermoelectric device applications.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Suneesh Meledath Valiyaveettil, Mohammad Qorbani, Cheng-Rong Hsing, Ta-Lei Chou, Laura Paradis-Fortin, Amr Sabbah, Divya Srivastava, Duc-Long Nguyen, Thi-Thong Ho, Tadesse Billo, Peramaiyan Ganesan, Ching -Ming Wei, Li-Chyong Chen, Kuei-Hsien Chen
Summary: The researchers achieved control over the carrier type by manipulating the quaternary Sn2Te2 rings in the material's structure and enhancing electronic transport by substituting Ni for Co, thereby improving the thermoelectric power factor. This study demonstrates the potential of ternary skutterudite materials like CoSn1middot5Te1.5-x in thermoelectric conversion.
MATERIALS TODAY PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Iyyappa Rajan Panneerselvam, Sunaja Devi Kalathiparambil Rajendra Pai, Carlos Baldo, Navamathavan Rangaswamy, Mahalakshmi Sahasranaman
Summary: The research demonstrates the potential of ternary ultrawide-band-gap materials GaB3N4 and AlB3N4 for high-temperature thermoelectric applications, with ultrahigh power factors as high as 1821 mu W m(-1) K-2 and 1876 mu W m(-1) K-2 at 2000 K. Despite higher lattice thermal conductivities, the calculated ZT values show promise for high-temperature applications, suggesting that focusing on power factors rather than ZT factor may be more beneficial.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Zhuang-Hao Zheng, Xiao-Lei Shi, Dong-Wei Ao, Wei-Di Liu, Meng Li, Liang-Zhi Kou, Yue-Xing Chen, Fu Li, Meng Wei, Guang-Xing Liang, Ping Fan, Gao Qing (Max) Lu, Zhi-Gang Chen
Summary: Flexible thermoelectric materials with high performance and flexibility show potential for converting waste heat into useful electricity. The textured structure design of Bi2Te3 thin films provides high thermoelectric performance and withstands 2,000 bending tests, demonstrating excellent flexibility. A flexible device assembled from 40 pairs of thin films exhibits outstanding output power density under temperature gradient, indicating its potential application in harvesting thermal energy from the environment or human bodies.
NATURE SUSTAINABILITY
(2023)
Article
Chemistry, Physical
Qing-Yu Xie, Jiang-Jiang Ma, Qing-Yi Liu, Peng-Fei Liu, Pei Zhang, Kai-Wang Zhang, Bao-Tian Wang
Summary: In this study, the thermoelectric performance of two-dimensional IB-selenides XSe (X = Cu, Ag, Au) is investigated using density functional theory (DFT) and semi-classic Boltzmann transport theory. The results show that these monolayers exhibit small and anisotropic phonon velocities, large Gruneisen parameters, and drastic phonon scattering. Among them, CuSe monolayer shows the most remarkable thermoelectric performance.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Lili Su, Xian Luo, Bo-Wei Huang, Bin Huang, Jiang-Hua Shen, Yan-Qing Yang
Summary: Ag and Pb co-doped polycrystalline SnSe materials were prepared and their thermoelectric properties were systematically investigated. The addition of Pb effectively improved the conductivity, with a room temperature carrier concentration of 2.9 x 10(18) cm(-3) in the Sn0.94Ag0.01Pb0.05Se sample. Ag2Se phase was formed in the material. The growth of SnSe polycrystalline grains with increased content of Ag and Pb resulted in an increase in thermal conductivity. The ZT value of the Sn0.98Ag0.01Pb0.01Se sample at 873 K was 1.4, lower than that of pure SnSe polycrystalline.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Andrea Gemma, Fatemeh Tabatabaei, Ute Drechsler, Anel Zulji, Herve Dekkiche, Nico Mosso, Thomas Niehaus, Martin R. Bryce, Samy Merabia, Bernd Gotsmann
Summary: By combining the break junction technique with a suspended heat-flux sensor, the researchers measured the total thermal and electrical conductance of a single molecule, at room temperature, along with its Seebeck coefficient. The result is in agreement with predictions and opens new opportunities for thermoelectric applications.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Condensed Matter
A. Ghafari, W. Khan, C. Janowitz
Summary: Thermoelectric properties of SnSe, such as maximum thermoelectric performance and Lorenz number, were obtained using density functional theory and Boltzmann transport theory. Manipulation of band structure and energy factor led to higher maximum thermoelectric performance in SnSe.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Zhen Ji, Wenhao Li, Lu Yu, Zipei Zhang, Sitong Wei, Huihui Ding, Xinyue Yang, Weiyu Song, Shuqi Zheng
Summary: This work investigates the electronic structure, transport properties, and thermal properties of AMg(2)Sb(2)-based Zintl compounds (A = Ca, Sr, Ba). The minimum lattice thermal conductivity of these compounds is calculated to be considerably small in the thermoelectric systems. The n-type CaMg2Sb2 shows a higher zT value compared to the p-type, indicating its potential as a thermoelectric material.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Zihang Liu, Weihong Gao, Hironori Oshima, Kazuo Nagase, Chul-Ho Lee, Takao Mori
Summary: This work maximizes the electronic properties of the n-type Mg3.2Bi1.5Sb0.5 material through delicate microstructural design, resulting in a high zT value over a broad temperature range. Additionally, a breakthrough is achieved in the non-Bi2Te3 thermoelectric module for room-temperature power generation and cooling, indicating potential commercial applications.
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Miguel A. Sierra, David Sanchez, Rafael Gutierrez, Gianaurelio Cuniberti, Francisco Dominguez-Adame, Elena Diaz
Editorial Material
Physics, Multidisciplinary
David Sanchez, Michael Moskalets
Article
Physics, Multidisciplinary
Nassima Benchtaber, David Sanchez, Llorenc Serra
Summary: This study investigates the electronic confinement in bilayer graphene using topological loops of different shapes. The spectrum of large-area loops can be described by a quantization rule based on the loop perimeter, while the spectrum of small loops depends on their shape. Zero-energy states exhibit a distinct pattern that is strongly influenced by spatial symmetry.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sungguen Ryu, Rosa Lopez, Raul Toral
Summary: Researchers introduce a robust Maxwell demon that can generate many-body entanglement against bit-flip noises, leading to quantum advantage. They utilize the voter model protocol and derive upper bounds for entropy reduction and work extraction rates. These findings suggest that many-body entanglement stabilization and work extraction are possible under certain conditions.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Condensed Matter
Nassima Benchtaber, David Sanchez, Llorenc Serra
Summary: Two types of confinement in bilayer graphene by top and bottom gating with symmetrical microelectrodes, trivial confinement and topological confinement, are discussed and compared. The main qualitative difference between the two confinement types is shown in the magnetic field dependence, with explicit calculations illustrating the findings. Trivial confinement shows degenerate Landau bands with a non-centered gap, while topological confinement shows a sequence of state branches always crossing zero energy without a field-induced gap.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Multidisciplinary Sciences
Sungguen Ryu, Rosa Lopez, Llorenc Serra, David Sanchez
Summary: This study demonstrates that a periodically driven quantum chiral conductor can exhibit efficiencies beyond the Carnot limit while the second law of thermodynamics is preserved.
NATURE COMMUNICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Juan De Gregorio, David Sanchez, Raul Toral
Summary: In this study, we investigate the memory properties of discrete sequences composed of a finite number of states. We find that the memory of systems modeled as arbitrary finite order Markov chains can be reliably determined using block entropy. Additionally, we propose an entropy estimator that accurately estimates memory even in the presence of correlations. We validate our findings by calculating the memory of daily precipitation series at different locations, and our results are consistent with existing methods while being applicable in undersampled regimes and independent of model selection.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Mathematics, Applied
David Sanchez, Luciano Zunino, Juan De Gregorio, Raul Toral, Claudio Mirasso
Summary: Words are fundamental linguistic units that are connected through meaning and syntactic rules. By analyzing the statistical connections between words using an ordinal pattern approach, we discovered unique pattern distributions for different languages. These pattern distributions can be used to determine the historical period and author of a text. Our findings highlight the significance of ordinal time series analysis in linguistic typology, historical linguistics, and stylometry.
Article
Humanities, Multidisciplinary
Thomas Louf, Bruno Goncalves, Jose J. Ramasco, David Sanchez, Jack Grieve
Summary: Cultural areas are important in understanding human behavior and attitudes towards different issues. However, the process of selecting common traits that define a cultural area is somewhat arbitrary. This study introduces a method to infer cultural regions based on the analysis of large datasets from microblogging posts. The method identifies regional variations in written discourse by analyzing geotagged tweets and clustering the data to uncover clear cultural areas and the topics of discussion that define them.
HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sun-Yong Hwang, Bjorn Sothmann, David Sanchez
Summary: We propose a refrigeration scheme for a mesoscopic superconductor-quantum dot hybrid device that can significantly cool down a normal metal coupled to it by applying a bias voltage. The cooling power can reach up to 0.05A20/h where A0 is the absolute value of the superconducting order parameter. Unlike previous proposals, our device operates without any magnetic elements and can be optimized by tuning system parameters. Our theory determines the temperature drop of the normal reservoir in the nonlinear transport regime and achieves efficiencies close to half of the Carnot bound.
Article
Mathematics, Applied
Pablo Rosillo-Rodes, Maxi San Miguel, David Sanchez
Summary: Language shift is common in multilingual societies. Language ideologies play a crucial role in understanding language usage and attitudes. Speaker preferences are found to be significant in language shift, and the degree of interaction between individuals with opposing preferences also affects the process.
Article
Materials Science, Multidisciplinary
S. Mojtaba Tabatabaei, David Sanchez, Alfredo Levy Yeyati, Rafael Sanchez
Summary: We discuss a quantum thermal machine that generates power from a thermally driven double quantum dot coupled to normal and superconducting reservoirs. Energy exchange between the dots is mediated by electron-electron interactions. We find that the heat engine efficiency increases with increasing coupling to the superconducting reservoir. The presence of the superconducting gap and the strong energy dependence of the electronic density of states around the gap edges contribute to large efficiencies. The competition between Andreev processes and quasiparticle tunneling is observed in the system. Our results emphasize the importance of both pair tunneling and structured band spectrum for an accurate characterization of the heat engine properties in normal-superconducting coupled dot systems.
Article
Physics, Multidisciplinary
Thomas Louf, David Sanchez, Jose J. Ramasco
Summary: The cultural diversity encoded within languages is at risk due to globalization leading to language extinction. Understanding the driving factors of language extinction and mechanisms for coexistence is crucial. Large-scale empirical analysis reveals diverse spatial patterns of language coexistence, and the importance of history in understanding the present state of languages.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Nassima Benchtaber, David Sanchez, Llorenc Serra
Summary: Research shows that local kink-antikink potentials applied to gapped bilayer graphene can modulate scattering of topological currents, resulting in anomalous steps in junction conductance, and forming a loop can reveal the system's energy spectrum. Additionally, these kink-antikink devices can function as valley filters with tiny magnetic fields by tuning a central gate.
