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We employ the density matrix renormalization group to construct the exact time-dependent exchange correlation potential for an impurity model with an applied transport voltage. Even for short-ranged interaction we find an infinitely…

介观与纳米尺度物理 · 物理学 2017-09-13 Peter Schmitteckert , Michael Dzierzawa , Peter Schwab

We study the transport properties of frustrated itinerant magnets comprising localized {\it classical} moments, which interact via exchange with the conduction electrons. Strong frustration stabilizes a liquidlike spin state, which extends…

强关联电子 · 物理学 2016-11-11 Zhentao Wang , Kipton Barros , Gia-Wei Chern , Dmitrii L. Maslov , Cristian D. Batista

The implementation of strategies for fault detection and diagnosis on rotating electrical machines is crucial for the reliability and safety of modern industrial systems. The contribution of this work is a methodology that combines…

系统与控制 · 电气工程与系统科学 2023-06-19 María Barroso , José M. Bossio , Carlos M. Alaíz , Ángela Fernández

The temperature dependence of the conductance of a quantum point contact has been measured. The conductance as a function of the Fermi energy shows temperature-independent fixed points, located at roughly multiple integers of $e^{2}/h$.…

介观与纳米尺度物理 · 物理学 2009-10-31 V. Senz , T. Heinzel , T. Ihn , S. Lindemann , R. Held , K. Ensslin , W. Wegscheider , M. Bichler

Gate capacitances of back-gated nanowire field-effect transistors (NW-FETs) are calculated by means of finite element methods and the results are compared with analytical results of the ``metallic cylinder on an infinite metal plate…

其他凝聚态物理 · 物理学 2009-11-11 Olaf Wunnicke

The effect of realistic metal electronic structure on the lower limit of resistivity in [100] oriented n-Si is investigated using full band Density Functional Theory and Semi-Empirical Tight Binding (TB) calculations. Using simulation unit…

材料科学 · 物理学 2015-06-19 Ganesh Hegde , R. Chris Bowen

We introduce a new quantum transport formalism based on a map of a real 3-dimensional lead-conductor-lead system into an effective 1-dimensional system. The resulting effective 1D theory is an in principle exact formalism to calculate the…

其他凝聚态物理 · 物理学 2013-05-29 Pierre Darancet , Valerio Olevano , Didier Mayou

All density functional calculations of single-molecule transport to date have used continuous exchange-correlation approximations. The lack of derivative discontinuity in such calculations leads to the erroneous prediction of metallic…

介观与纳米尺度物理 · 物理学 2009-11-11 C. Toher , A. Filippetti , S. Sanvito , Kieron Burke

In this letter, we report on the theoretical investigations of electron mobility in practically viable designs of InxGa1-xN channel high electron mobility transistors (HEMT). Carriers in such devices are expected to exhibit a higher…

材料科学 · 物理学 2015-04-17 Vikash K. Singh , Digbijoy N. Nath

The accurate extraction and the reliable, repeatable reduction of graphene - metal contact resistance (R$_{C}$) are still open issues in graphene technology. Here, we demonstrate the importance of following clear protocols when extracting…

We numerically investigate the electronic transport properties between two mesoscopic graphene disks with a twist by employing the density functional theory coupled with non-equilibrium Green's function technique. By attaching two graphene…

介观与纳米尺度物理 · 物理学 2020-07-01 Yulei Han , Yafei Ren , Xinlong Dong , Junjie Zeng , Wei Ren , Zhenhua Qiao

Two-dimensional (2D) crystalline semiconductors hold promise for next-generation electronic devices due to its atomical thickness and consequent properties. Despite years of search, literature-reported 2D semiconductors commonly suffered…

材料科学 · 物理学 2024-04-15 Chenmu Zhang , Yuanyue Liu

III-V tunneling field-effect transistors (TFETs) offer great potentials in future low-power electronics application due to their steep subthreshold slope and large "on" current. Their 3D quantum transport study using non-equilibrium Green's…

介观与纳米尺度物理 · 物理学 2016-10-04 Jun Z. Huang , Lining Zhang , Pengyu Long , Michael Povolotskyi , Gerhard Klimeck

This paper addresses the localization of contacts of an unknown grasped rigid object with its environment, i.e., extrinsic to the robot. We explore the key role that distributed tactile sensing plays in localizing contacts external to the…

机器人学 · 计算机科学 2021-03-25 Daolin Ma , Siyuan Dong , Alberto Rodriguez

Recent experiments have shown that transport properties of molecular-scale devices can be reversibly altered by the surrounding solvent. Here, we use a combination of first-principles calculations and experiment to explain this change in…

介观与纳米尺度物理 · 物理学 2015-09-03 Michele Kotiuga , Pierre Darancet , Carlos R. Arroyo , Latha Venkataraman , Jeffrey B. Neaton

We performed a benchmark study on a series of dihydrogen bond complexes and constructed a set of reference bond distances and interaction energies. The test set was employed to assess the performance of several wave-function correlated and…

化学物理 · 物理学 2015-01-22 E. Fabiano , L. A. Constantin , F. Della Sala

Channel conductance measurements can be used as a tool to study thermally activated electron transport in the sub-threshold region of state-of-art FinFETs. Together with theoretical Tight-Binding (TB) calculations, this technique can be…

We use a frequency-dependent electro-optic technique to measure the hole mobility in small molecule organic semiconductors, such as 6,13 bis(triisopropylsilylethynyl)-pentacene. Measurements are made on semiconductor films in bottom gate,…

材料科学 · 物理学 2012-12-20 Emily G. Bittle , Joseph W. Brill , Joseph P. Straley

Ab initio computation of two-dimensional electronic spectra is an expanding field, whose goal is improving upon simple, few-dimensional models often employed to explain experiments. Here, we propose an accurate and computationally…

化学物理 · 物理学 2024-09-26 Tomislav Begušić , Jiří Vaníček

A function-on-function regression model with quadratic and interaction effects of the covariates provides a more flexible model. Despite several attempts to estimate the model's parameters, almost all existing estimation strategies are…

统计方法学 · 统计学 2024-10-25 Ufuk Beyaztas , Han Lin Shang , Abhijit Mandal