Strong correlations in two-dimensional quantum fluids of4He and3He adsorbed on hectorite

1995 ◽  
Vol 101 (3-4) ◽  
pp. 409-414 ◽  
Author(s):  
Nobuo Wada ◽  
Hideo Yano
Keyword(s):  
Quantum Fluids ◽  
Two Dimensional ◽  
Strong Correlations

Parameter correlation study of cylinder liner roughness for production and quality control

2008 ◽  
Vol 222 (11) ◽  
pp. 1475-1487 ◽  
Author(s):  
B-G Rosen ◽  
C Anderberg ◽  
R Ohlsson
Keyword(s):  
Three Dimensional ◽  
Cylinder Liner ◽  
Correlation Study ◽  
Two Dimensional ◽  
Strong Correlations ◽  
Intrinsic Variability ◽  
Dimensional Parameters ◽  
Liner Surface ◽  
Highly Correlated

Surface roughness plays an important role in the control of emissions and friction losses in the cylinder liner—piston ring system as well as securing economically favourable manufacturing. A number of different commercial cylinder liner types have been characterized using traditional two-dimensional stylus and ISO parameters together with the latest three-dimensional characterization. The results highlight the weak and strong correlations between different families of parameters traditionally used for liner surface specifications. The bearing curve based Rxq and Rk parameter families have been evaluated and show systematic and consistent differences when characterizing the same surface features when trying to establish independent characterization of the highly stratified, two-process cylinder liner surfaces. No significant improvement in discrimination results from using ensemble averages. Presentation of correlations in the form of topological diagrams helps to show when parameters with a high intrinsic variability can be effectively replaced by other more robust parameters with which they have a high correlation. Plateau parameters are in general more highly correlated than valley parameters. Three-dimensional parameters show high internal correlations and also correlate highly with some corresponding two-dimensional parameters.

scholarly journals Observation of superfluidity in a strongly correlated two-dimensional Fermi gas

Science ◽  
2021 ◽  
Vol 372 (6544) ◽  
pp. 844-846
Author(s):  
Lennart Sobirey ◽  
Niclas Luick ◽  
Markus Bohlen ◽  
Hauke Biss ◽  
Henning Moritz ◽  
...  
Keyword(s):  
Periodic Potential ◽  
Direct Evidence ◽  
Interaction Strength ◽  
Fermi Gas ◽  
Model Systems ◽  
Strongly Correlated ◽  
Two Dimensional ◽  
Strong Correlations ◽  
Critical Temperatures ◽  
Reduced Dimensionality

Understanding how strongly correlated two-dimensional (2D) systems can give rise to unconventional superconductivity with high critical temperatures is one of the major unsolved problems in condensed matter physics. Ultracold 2D Fermi gases have emerged as clean and controllable model systems to study the interplay of strong correlations and reduced dimensionality, but direct evidence of superfluidity in these systems has been missing. We demonstrate superfluidity in an ultracold 2D Fermi gas by moving a periodic potential through the system and observing no dissipation below a critical velocity vc. We measure vc as a function of interaction strength and find a maximum in the crossover regime between bosonic and fermionic superfluidity. Our measurements enable systematic studies of the influence of reduced dimensionality on fermionic superfluidity.

scholarly journals Introduction

1993 ◽  
Vol 46 (3) ◽  
pp. 329
Author(s):  
D Neilson ◽  
MP Das
Keyword(s):  
Electronic Device ◽  
Thin Layers ◽  
Atomic Scale ◽  
Two Dimensional ◽  
Strong Correlations ◽  
Semiconductor Substrate ◽  
Artificial Structures ◽  
Technological Advances ◽  
Quantum Mechanical Effects ◽  
Insight Into

The subjects for this workshop were nanostructures and quasi-two-dimensional systems. Artificial nanostructures have structure on the scale of nanometres (1O~9 m). The nanometre represents a limit on the miniaturisation of artificial structures since atomic diameters are of this scale. Two-dimensional systems are atomically thin layers, usually of electrons embedded in a semiconductor substrate. These fascinating systems owe their existence to the rapid advances within the last ten years in electronic device miniaturisation and manufacture. Spectacular as the technological advances have been, the focus of the workshop was not on these achievements themselves, but on the opportunities the technology provides to think up and build artificial systems having exotic physical properties that give us insight into structure on a quantum scale. Since the atomic scale is determined by the dictates of quantum mechanics it is not surprising that artificial structures on this scale should have properties which are dominated by quantum mechanical effects and strong correlations, and that these often generate novel ground states.

scholarly journals Quantum storm in a cold cup

2021 ◽  
Vol 52 (3) ◽  
pp. 25-27
Author(s):  
Carlo F. Barenghi ◽  
Ladislav Skrbek
Keyword(s):  
Quantum Physics ◽  
Quantum Turbulence ◽  
Quantized Vortices ◽  
Quantum Fluids ◽  
Two Dimensional ◽  
Classical Physics

Quantum turbulence, which manifests itself via a tangle of quantized vortices, occurs in quantum fluids, whose properties depend on quantum physics rather than classical physics. Here we report on two limiting forms of quantum turbulence which have been identified and how two-dimensional turbulence, until recently a mathematical idealization, has become experimental reality.

Dilute two dimensional interacting quantum fluids

1978 ◽  
Vol 68 (1) ◽  
pp. 63-64 ◽  
Author(s):  
S.M. Havens ◽  
A. Widom
Keyword(s):  
Quantum Fluids ◽  
Two Dimensional
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