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A scanning force microscope with a base temperature below 300 mK is used for measuring the local electron density of a two-dimensional electron gas embedded in an Ga[Al]As heterostructure. At different separations between AFM tip and…

介观与纳米尺度物理 · 物理学 2009-11-10 T. Vancura , S. Kicin , T. Ihn , K. Ensslin , M. Bichler , W. Wegscheider

The recent developments of quantum computing present potential novel pathways for quantum chemistry, as the increased computational power of quantum computers could be harnessed to naturally encode and solve electronic structure problems.…

量子物理 · 物理学 2024-03-01 Lila Cadi Tazi , Alex J. W. Thom

In this work, the pressure-driven flow of symmetric electrolyte liquid through a heterogeneously charged contraction-expansion (4:1:4) microfluidic device has been investigated numerically. Total potential ($U$), ion concentrations…

流体动力学 · 物理学 2023-12-27 Jitendra Dhakar , Ram Prakash Bharti

We report microwave surface impedances of FeSe$_{0.4}$Te$_{0.6}$ single crystals measured at 12, 19, and 44 GHz. The penetration depth exhibits a power law behavior, $\delta \lambda_L=\lambda_L (T)-\lambda_L (0) \propto CT^n$ with an…

超导电性 · 物理学 2011-11-03 Hideyuki Takahashi , Yoshinori Imai , Seiki Komiya , Ichiro Tsukada , Atsutaka Maeda

A new method for examining the possible space-time variation of the fine structure constant ($\alpha$) is proposed. The technique uses a relatively simple measurement with an optical resonator to compare atom-stabilized optical frequency…

原子物理 · 物理学 2007-05-23 J. R. Torgerson

Seismic surface wave dispersion inversion is used widely to study the subsurface structure of the Earth. The dispersion property is usually measured by using frequency-phase velocity (f-c) analysis and by picking phase velocities from the…

地球物理 · 物理学 2022-09-07 Xin Zhang , York Zheng , Andrew Curtis

The brightest southern quasar above redshift $z=1$, HE 0515$-$4414, with its strong intervening metal absorption-line system at $z_{abs}=1.1508$, provides a unique opportunity to precisely measure or limit relative variations in the…

宇宙学与河外天体物理 · 物理学 2016-12-07 Srđan M. Kotuš , Michael T. Murphy , Robert F. Carswell

We propose a method for temperature measurement by analyzing the frequency of generated time crystals in one-dimensional (1D) quantum droplets. The system consists of a binary Bose-Einstein condensate mixture confined in a driven…

量子气体 · 物理学 2025-08-07 Saurab Das , Jagnyaseni Jogania , Jayanta Bera , Ajay Nath

Recent developments in experiments with vibrational electron energy loss spectroscopy (EELS) have revealed spectral shape variations at spatial resolutions down to sub-atomic scale. Interpretation in terms of local phonon density of states…

材料科学 · 物理学 2021-09-15 Paul M. Zeiger , Ján Rusz

We studied the interaction between salts and surfactants on the water surface using heterodyne-detected vibrational sum frequency generation (HD-VSFG) spectroscopy. We used sodium dodecyl sulfate (SDS) as a prototype surfactant system at 75…

软凝聚态物质 · 物理学 2025-08-15 Sanghamitra Sengupta , Jan Versluis , Huib J. Bakker

Phase Resolved Optical Emission Spectroscopy (PROES) measurements combined with 1d3v Particle-in-Cell/Monte Carlo Collision (PIC/MCC) simulations are performed to investigate the excitation dynamics in low-pressure capacitively coupled…

等离子体物理 · 物理学 2023-07-21 Aranka Derzsi , Mate Vass , Ranna Masheyeva , Benedek Horvath , Zoltan Donko , Peter Hartmann

Phonon densities of states (DOS) of bcc $\alpha$-$^{57}$Fe were measured from room temperature through the 1044K Curie transition and the 1185K fcc $\gamma$-Fe phase transition using nuclear resonant inelastic x-ray scattering. At higher…

材料科学 · 物理学 2015-06-19 L. Mauger , M. S. Lucas , J. A. Muñoz , S. J. Tracy , M. Kresch , Yuming Xiao , Paul Chow , B. Fultz

Fundamental considerations predict that macroscopic quantum systems such as superfluids and the electrons in superconductors will exhibit oscillatory motion when pushed through a small constriction. Here we report the observation of these…

超导电性 · 物理学 2007-05-23 E. Hoskinson , R. E. Packard

Turbulent motions induce Doppler shifts of observable emission and absorption lines motivating studies of turbulence using precision spectroscopy. We provide the numerical testing of the two most promising techniques, Velocity Channel…

天体物理学 · 物理学 2009-09-29 A. Chrupnov , A. Lazarian

The flux density scale of Perley and Butler (2013) is extended downwards to ~50 MHz by utilizing recent observations with the Karl G. Jansky Very Large Array (VLA) of 20 sources between 220 MHz and 48.1 GHz, and legacy VLA observations at…

天体物理仪器与方法 · 物理学 2017-05-31 R. A. Perley , B. J. Butler

Quasiparticle dynamics of FeSe single crystals revealed by dual-color transient reflectivity measurements ({\Delta}R/R) provides unprecedented information on Fe-based superconductors. The amplitude of fast component in {\Delta}R/R clearly…

The surface acoustic wave (SAWs) attenuation coefficient $\Gamma$ and the velocity change $\Delta V /V$ were measured for $p$-type Si/SiGe heterostructures in the temperature range 0.7 - 1.6 K as a function of external magnetic field $H$ up…

介观与纳米尺度物理 · 物理学 2007-05-23 G. O. Andrianov , I. L. Drichko , A. M. Diakonov , I. Yu. Smirnov , O. A. Mironov , M. Myronov , T. E. Whall , D. R. Leadley

Accurate measurements of different transition frequencies between atomic levels of the electronic and hyperfine structure over time are used to investigate temporal variations of the fine structure constant $\alpha$ and the…

原子物理 · 物理学 2014-12-01 N. Huntemann , B. Lipphardt , Chr. Tamm , V. Gerginov , S. Weyers , E. Peik

This paper investigates the effects of setting the sampling frequency significantly higher than conventional guidelines in system identification. Although continuous-time identification methods resolve the numerical difficulties encountered…

系统与控制 · 电气工程与系统科学 2025-06-05 Ichiro Maruta , Toshiharu Sugie

We report an ab initio molecular dynamics study of fluid mercury at temperature 1750 K in the range of densities 7-13.5 g/cm$^3$. Along this isothermal line we performed an analysis of total charge fluctuations, which make evidence of…

无序系统与神经网络 · 物理学 2025-06-26 T. Bryk , O. Bakai , A. P. Seitsonen