物理与天体物理最新文献

{"title":"Electrical conductivity of the quark-gluon plasma in the presence of strong magnetic fields","authors":"Giorgio Almirante, Nikita Astrakhantsev, V. V. Braguta, Massimo D’Elia, Lorenzo Maio, Manuel Naviglio, Francesco Sanfilippo, Anton Trunin","doi":"10.1103/physrevd.111.034505","DOIUrl":"https://doi.org/10.1103/physrevd.111.034505","url":null,"abstract":"We compute the electrical conductivity of the strongly interacting medium in the presence of strong magnetic background fields, e</a:mi>B</a:mi>=</a:mo>4</a:mn></a:math>, <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mrow><c:mn>9</c:mn><c:mtext> </c:mtext><c:mtext> </c:mtext><c:msup><c:mrow><c:mi>GeV</c:mi></c:mrow><c:mrow><c:mn>2</c:mn></c:mrow></c:msup></c:mrow></c:math>, and for different values of the temperature, both in the confined and in the deconfined quark-gluon plasma (QGP) phase. The conductivity is obtained from the Euclidean lattice time correlator of the electrical current, computed on gauge configurations sampled from Monte-Carlo simulations of an improved staggered discretization of <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msub><e:mi>N</e:mi><e:mi>f</e:mi></e:msub><e:mo>=</e:mo><e:mn>2</e:mn><e:mo>+</e:mo><e:mn>1</e:mn></e:math> QCD. We perform the inverse Laplace transform of the correlator adopting a recently proposed version of the standard Backus-Gilbert procedure for the inversion. The results obtained in the QGP phase show a sizable enhancement of the conductivity in the direction parallel to the magnetic field, as well as a suppression in the direction orthogonal to it. The enhancement can interpreted through various different mechanisms, typically involving the chiral anomaly, among which the chiral magnetic effect (CME): for this reason we try to interpret our observations based on a CME-inspired , we extract the relaxation time of this process, extrapolate it to the continuum limit and compare it to previous results, finding it lower than expected in the explored range of temperatures. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"56 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plane-parallel waves as Jacobi–Lie models","authors":"Ivo Petr and Ladislav Hlavatý","doi":"10.1088/1361-6382/adaabb","DOIUrl":"https://doi.org/10.1088/1361-6382/adaabb","url":null,"abstract":"T-duality and its generalizations are widely recognized either as symmetries or solution-generating techniques in string theory. Recently introduced Jacobi–Lie T-plurality is based on Leibniz algebras whose structure constants satisfy further conditions. Low dimensional Jacobi–Lie bialgebras were classified a few years ago. We study four- and six-dimensional algebras with structure constants and show that there are several classes consisting of mutually isomorphic algebras. Using isomorphisms between Jacobi–Lie bialgebras we investigate three- and four-dimensional sigma models related by Jacobi–Lie T-plurality with and without spectators. In the Double Field Theory formulation constant generalized fluxes FA are used in the literature to transform dilaton field. We extend the procedure to non-constant fluxes and verify that obtained backgrounds and dilatons solve Supergravity Equations. Most of the resulting backgrounds have vanishing curvature scalars and, as can be seen by finding Brinkmann coordinates, represent plane-parallel waves.","PeriodicalId":10282,"journal":{"name":"Classical and Quantum Gravity","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Continuous-variable quantum key distribution with noisy squeezed states","authors":"Akash nag Oruganti, Ivan Derkach, Radim Filip and Vladyslav C Usenko","doi":"10.1088/2058-9565/ada9c4","DOIUrl":"https://doi.org/10.1088/2058-9565/ada9c4","url":null,"abstract":"We address the crucial role of noisy squeezing in security and performance of continuous-variable (CV) quantum key distribution (QKD) protocols. Squeezing has long been recognized for its numerous advantages in CV QKD, such as enhanced robustness against channel noise and loss, and improved secret key rates. However, the excess noise of the squeezed states, that unavoidably originates already from optical loss as well as other imperfections in the source, raises concerns about its potential exploitation by an eavesdropper. For the widely adopted trust assumption on the excess noise in the signal states, we confirm the stability of the protocol against the noisy squeezing in both purely attenuating as well as noisy channels in the asymptotic limit, which implies perfect parameter estimation. In the finite-size regime we show that this stability largely holds at up to 107 data points using optimal biased homodyne detection for key distribution and parameter estimation. Untrusted assumption on the noisy squeezing, on the other hand, introduces additional security bounds on the squeezing excess noise already in the asymptotic regime, which is further enforced by the finite-size effects. Additionally, we show the critical negative role of noisy squeezing in the case of atmospheric free-space channels, already in the trusted-noise and asymptotic assumptions, which emphasizes the importance of squeezing purity in the free-space quantum channels. Our results pave the way towards practical realization of squeezed-state CV QKD protocols in both fibre and free-space channels.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"96 51 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Southern Twenty-centimetre All-sky Polarization Survey (STAPS): Survey description and maps","authors":"X. Sun, M. Haverkorn, E. Carretti, T. Landecker, B. M. Gaensler, S. Poppi, L. Staveley-Smith, X. Gao, J. Han","doi":"10.1051/0004-6361/202453326","DOIUrl":"https://doi.org/10.1051/0004-6361/202453326","url":null,"abstract":"We present data processing and verification of the Southern Twenty-centimetre All-sky Polarization Survey (STAPS) conducted with Murriyang, the Parkes 64-m telescope. The survey covers the sky area of −89° < Dec < 0° and the frequency range of 1.3–1.8 GHz split into 1-MHz channels. STAPS was observed commensally with the S-band Polarization All-Sky Survey (S-PASS). The survey is composed of long azimuth scans, which allows us to absolutely calibrate Stokes <i>Q<i/> and <i>U<i/> with the data processing procedure developed for S-PASS. We obtained <i>I<i/>, <i>Q<i/>, and <i>U<i/> maps on both the flux density scale (Jy beam<sup>−1<sup/>) and the main beam brightness temperature scale (K), for the 301 frequency channels with sufficiently good data. The temperature scale is tied to the Global Magneto-ionic Medium Survey (GMIMS) high-band north sky survey conducted with the Dominion Radio Astrophysical Observatory 26-m telescope. All the STAPS maps are smoothed to a common resolution of 20′. The root mean square (rms) noise per channel ranges from about 16 mK to 8 mK for <i>I<i/>, and from about 8 mK to 5 mK for <i>Q<i/> and <i>U<i/>, at frequencies from 1.3 to 1.8 GHz. The rms noise in <i>Q<i/> and <i>U<i/> varies with declination and reaches minimum at declination of −89°. We also ran rotation measure (RM) synthesis and RM clean to obtain peak polarized intensity and Faraday depth maps. The whole STAPS data processing was validated by comparing flux densities of compact sources, pixel flux density versus pixel flux density for Cen A, pixel temperature versus pixel temperature for the entire survey area, and the RMs of extragalactic sources between STAPS and other measurements. The uncertainty of the flux density scale is less than 10%. STAPS delivers an L-band (<i>λ<i/>20 cm) multifrequency polarization view of the Galaxy, and will help advance our understanding of the Galactic magnetic field and magnetized interstellar medium.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":"78 1","pages":""},"PeriodicalIF":6.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Solar System’s passage through the Radcliffe wave during the middle Miocene","authors":"E. Maconi, J. Alves, C. Swiggum, S. Ratzenböck, J. Großschedl, P. Köhler, N. Miret-Roig, S. Meingast, R. Konietzka, C. Zucker, A. Goodman, M. Lombardi, G. Knorr, G. Lohmann, J. C. Forbes, A. Burkert, M. Opher","doi":"10.1051/0004-6361/202452061","DOIUrl":"https://doi.org/10.1051/0004-6361/202452061","url":null,"abstract":"<i>Context<i/>. As the Solar System orbits the Milky Way, it encounters various Galactic environments, including dense regions of the interstellar medium (ISM). These encounters can compress the heliosphere, exposing parts of the Solar System to the ISM, while also increasing the influx of interstellar dust into the Solar System and Earth’s atmosphere. The discovery of new Galactic structures, such as the Radcliffe wave, raises the question of whether the Sun has encountered any of them.<i>Aims<i/>. The present study investigates the potential passage of the Solar System through the Radcliffe wave gas structure over the past 30 million years (Myr).<i>Methods<i/>. We used a sample of 56 high-quality, young (≤30 Myr) open clusters associated with a region of interest of the Radcliffe wave to trace its motion back and investigate a potential crossing with the Solar System’s past orbit.<i>Results<i/>. We find that the Solar System’s trajectory intersected the Radcliffe wave in the Orion region. We have constrained the timing of this event to between 18.2 and 11.5 Myr ago, with the closest approach occurring between 14.8 and 12.4 Myr ago. Notably, this period coincides with the Middle Miocene climate transition on Earth, providing an interdisciplinary link with paleoclimatology. The potential impact of the crossing of the Radcliffe wave on the climate on Earth is estimated. This crossing could also lead to anomalies in radionuclide abundances, which is an important research topic in the field of geology and nuclear astrophysics.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":"30 1","pages":""},"PeriodicalIF":6.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tracing magnetic switchbacks to their source: An assessment of solar coronal jets as switchback precursors","authors":"N. Bizien, C. Froment, M. S. Madjarska, T. Dudok de Wit, M. Velli","doi":"10.1051/0004-6361/202452140","DOIUrl":"https://doi.org/10.1051/0004-6361/202452140","url":null,"abstract":"<i>Context.<i/> The origin of large-amplitude magnetic field deflections in the solar wind, known as magnetic switchbacks, is still under debate. These structures, which are ubiquitous in the in situ observations made by Parker Solar Probe (PSP), likely have their seed in the lower solar corona, where small-scale energetic events driven by magnetic reconnection could provide conditions ripe for either direct or indirect generation.<i>Aims.<i/> We investigated potential links between in situ measurements of switchbacks and eruptions originating from the clusters of small-scale solar coronal loops known as coronal bright points to establish whether these eruptions act as precursors to switchbacks.<i>Methods.<i/> We traced solar wind switchbacks from PSP back to their source regions using the ballistic back-mapping and potential field source surface methods, and analyzed the influence of the source surface height and solar wind propagation velocity on magnetic connectivity. Using extreme ultraviolet images, we combined automated and visual approaches to identify small-scale eruptions (e.g., jets) in the source regions. The jet occurrence rate was then compared with the rate of switchbacks captured by PSP.<i>Results.<i/> We find that the source region connected to the spacecraft varies significantly depending on the source surface height, which exceeds the expected dependence on the solar cycle and cannot be detected via polarity checks. For two corotation periods that are straightforwardly connected, we find a matching level of activity (jets and switchbacks), which is characterized by the hourly rate of events and depends on the size of the region connected to PSP. However, no correlation is found between the two time series of hourly event rates. Modeling constraints and the event selection may be the main limitations in the investigation of a possible correlation. Evolutionary phenomena occurring during the solar wind propagation may also influence our results. These results do not allow us to conclude that the jets are the main switchback precursors, nor do they rule out this hypothesis. They may also indicate that a wider range of dynamical phenomena are the precursors of switchbacks.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":"15 1","pages":""},"PeriodicalIF":6.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diversity and multiplexing in quantum MIMO channels","authors":"Junaid ur Rehman,&nbsp;Leonardo Oleynik,&nbsp;Seid Koudia,&nbsp;Mert Bayraktar,&nbsp;Symeon Chatzinotas","doi":"10.1140/epjqt/s40507-025-00324-7","DOIUrl":"10.1140/epjqt/s40507-025-00324-7","url":null,"abstract":"<div><p>Characterization and exploitation of multiple channels between the transmitter and the receiver in multiple-input multiple-output (MIMO) communications brought a paradigm shift in classical communication systems. The techniques developed around MIMO communication systems not only brought unprecedented advancements in communication rates but also substantially improved the reliability of communication, measured by low error rates. We develop a framework for MIMO quantum communications with discrete-variable quantum systems. We propose a general model of MIMO quantum channels incorporating noise, losses, and crosstalk among multiple channels. We leverage the approximate quantum cloning to transmit imperfect clones of the input state over this channel setup. We demonstrate that transmitting multiple imperfect clones achieves better communication fidelity as compared to transmitting a single perfect copy of the state due to the diversity of the MIMO setup. We also demonstrate a practical tradeoff between fidelity and rate of communication and call it quantum diversity multiplexing tradeoff (DMT) due to its similarity with the well-known DMT in classical MIMO setups.</p></div>","PeriodicalId":547,"journal":{"name":"EPJ Quantum Technology","volume":"12 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://epjquantumtechnology.springeropen.com/counter/pdf/10.1140/epjqt/s40507-025-00324-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reduced cross section and gluon distribution in a momentum-space approach","authors":"G. R. Boroun, Phuoc Ha","doi":"10.1103/physrevd.111.034012","DOIUrl":"https://doi.org/10.1103/physrevd.111.034012","url":null,"abstract":"We present a calculation of the reduced cross section in the momentum-space approach utilizing the Block-Durand-Ha parametrization of the proton structure function F</a:mi>2</a:mn></a:msub>(</a:mo>x</a:mi>,</a:mo>Q</a:mi>2</a:mn></a:msup>)</a:mo></a:math> and the leading-order longitudinal structure function <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><e:msub><e:mi>F</e:mi><e:mi>L</e:mi></e:msub><e:mo stretchy=\"false\">(</e:mo><e:mi>x</e:mi><e:mo>,</e:mo><e:msup><e:mi>Q</e:mi><e:mn>2</e:mn></e:msup><e:mo stretchy=\"false\">)</e:mo></e:math>, proposed by Boroun and Ha [] using Laplace transform techniques. Our results are compared with the HERA data and extended to the Large Hadron electron Collider domain. We also examine the ratio <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><i:msub><i:mi>F</i:mi><i:mrow><i:mi>L</i:mi><i:mn>2</i:mn></i:mrow></i:msub><i:mo stretchy=\"false\">(</i:mo><i:mi>x</i:mi><i:mo>,</i:mo><i:msup><i:mi>Q</i:mi><i:mn>2</i:mn></i:msup><i:mo stretchy=\"false\">)</i:mo><i:mo>=</i:mo><i:msub><i:mi>F</i:mi><i:mi>L</i:mi></i:msub><i:mo stretchy=\"false\">(</i:mo><i:mi>x</i:mi><i:mo>,</i:mo><i:msup><i:mi>Q</i:mi><i:mn>2</i:mn></i:msup><i:mo stretchy=\"false\">)</i:mo><i:mo>/</i:mo><i:msub><i:mi>F</i:mi><i:mn>2</i:mn></i:msub><i:mo stretchy=\"false\">(</i:mo><i:mi>x</i:mi><i:mo>,</i:mo><i:msup><i:mi>Q</i:mi><i:mn>2</i:mn></i:msup><i:mo stretchy=\"false\">)</i:mo></i:math> obtained from our work, comparing it with both the H1 data and the color dipole picture bounds. We find that our results for the reduced cross section and the ratio <q:math xmlns:q=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><q:msub><q:mi>F</q:mi><q:mrow><q:mi>L</q:mi><q:mn>2</q:mn></q:mrow></q:msub><q:mo stretchy=\"false\">(</q:mo><q:mi>x</q:mi><q:mo>,</q:mo><q:msup><q:mi>Q</q:mi><q:mn>2</q:mn></q:msup><q:mo stretchy=\"false\">)</q:mo></q:math> agree with the H1 data. Finally, our evaluation of the gluon distribution functions <u:math xmlns:u=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><u:mi>G</u:mi><u:mo stretchy=\"false\">(</u:mo><u:mi>x</u:mi><u:mo>,</u:mo><u:msup><u:mi>Q</u:mi><u:mn>2</u:mn></u:msup><u:mo stretchy=\"false\">)</u:mo></u:math> in the momentum-space approach shows very good concordance with the NNPDF3.0LO gluon structure functions for moderate <y:math xmlns:y=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><y:msup><y:mi>Q</y:mi><y:mn>2</y:mn></y:msup></y:math> in the range 10</ab:mn>−</ab:mo>5</ab:mn></ab:mrow></ab:msup>≤</ab:mo>x</ab:mi>≤</ab:mo>1</ab:mn></ab:math>. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"62 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143375662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polarized Infrared Spectroscopy of Textured Hematite (α-Fe2O3) Microcrystals","authors":"Parveen Garg,&nbsp;Uday Deshpande","doi":"10.1007/s13538-025-01709-w","DOIUrl":"10.1007/s13538-025-01709-w","url":null,"abstract":"<div><p>Polarized far-infrared spectroscopy analysis is presented on highly [210] textured α-Fe₂O₃ microcrystals grown on pure Fe substrate, using a facile and one step process. Main objective is to understand relationship between intensity of A_2u and E_u modes with incident polarization. In literature, the shape of E_u band at 460 cm⁻¹ was shown to be sensitive on crystallinity, particle shape and size. In this report it is shown that shape of this E_u band also varies the most with polarization compared to the other bands. The observed variation is attributed to different response of LO and TO components of the E_u band to incident polarization. The intensity of A_2u modes remains almost unchanged whereas that of the E_u modes shows a systematic variation. The observed intensity variation has been elucidated on the basis of direction of the texture and experimental geometry of measurement. A simulation of intensity of the E_u modes is presented, which shows cos²θ variation with different phase shifts and matches well with the experimental data.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 2","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design guidelines for Si metal–oxide–semiconductor and Si/SiGe heterostructure quantum dots for spin qubits","authors":"Yu-Cheng Li, Che-Hao Chang, Yu-Jui Wu, Chen-Yao Liao, Jiun-Yun Li","doi":"10.1063/5.0245929","DOIUrl":"https://doi.org/10.1063/5.0245929","url":null,"abstract":"Si-based spin qubits are promising due to their long decoherence time and the compatibility with state-of-the-art semiconductor technology and have been demonstrated using quantum dots (QDs) to host single electrons for spin manipulation. In this work, we simulate the electrostatics and quantum transport properties of quantum dots on a Si metal–oxide–semiconductor platform and a Si/SiGe heterostructure. We investigate the effects of gate configurations and the SiGe spacer thickness on device characteristics, such as gate capacitances, Coulomb blockade, and charge stability. For a single quantum dot, placing its barrier gates (BGs) under the plunger gate improves the charge stability, while swapping the positions of those gates reduces the effects of the barrier gate biases on the charge stability. A thicker SiGe spacer further suppresses the effects of the barrier gate biases on the charge stability for quantum dots on the Si/SiGe heterostructure but leads to stronger crosstalk between neighboring quantum dots. Wider barrier gates can help to mitigate the crosstalk effects for multiple quantum dots. These findings provide key insights into the optimization of the gate configurations and material selection to improve the charge stability and minimize the crosstalk by different gates for future development of scalable Si-based quantum dots.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"55 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}