scholarly journals Spin polarization of composite fermions and particle-hole symmetry breaking

2014 ◽  
Vol 90 (8) ◽  
Author(s):  
Yang Liu ◽  
S. Hasdemir ◽  
A. Wójs ◽  
J. K. Jain ◽  
L. N. Pfeiffer ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Spin Polarization ◽  
Composite Fermions

scholarly journals B5N5 monolayer: a room-temperature light element antiferromagnetic insulator

2020 ◽  
Vol 2 (10) ◽  
pp. 4421-4426
Author(s):  
Dong Zhang ◽  
Qihua Xiong ◽  
Kai Chang
Keyword(s):  
Symmetry Breaking ◽  
Fermi Surface ◽  
Spontaneous Symmetry Breaking ◽  
Spin Polarization ◽  
Room Temperature ◽  
Light Element ◽  
Spin Filter ◽  
Flat Bands

In atomically-thick B5N5 monolayer, antiferromagnetism arises from spontaneous symmetry breaking due to flat bands in the vicinity of the Fermi surface. An electric-controllable prototype spin filter with nearly 100% spin polarization is proposed based on B5N5 monolayers.

Temperature dependence of the spin polarization of composite fermions

JETP Letters ◽  
1999 ◽  
Vol 70 (11) ◽  
pp. 730-735 ◽  
Author(s):  
I. V. Kukushkin ◽  
K. von Klitzing ◽  
K. G. Levchenko ◽  
Yu. E. Lozovik
Keyword(s):  
Temperature Dependence ◽  
Spin Polarization ◽  
Composite Fermions

scholarly journals Composite fermions in electroweak symmetry breaking

2009 ◽  
Vol 2009 (02) ◽  
pp. 029-029 ◽  
Author(s):  
Riccardo Barbieri ◽  
Gino Isidori ◽  
Duccio Pappadopulo
Keyword(s):  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Composite Fermions ◽  
Electroweak Symmetry

Spin Polarization of Composite Fermions: Measurements of the Fermi Energy

1999 ◽  
Vol 82 (18) ◽  
pp. 3665-3668 ◽  
Author(s):  
I. V. Kukushkin ◽  
K. v. Klitzing ◽  
K. Eberl
Keyword(s):  
Spin Polarization ◽  
Fermi Energy ◽  
Composite Fermions

Symmetry breaking in convergent-beam diffraction

1989 ◽  
Vol 47 ◽  
pp. 480-481
Author(s):  
D.J. Eaglesham
Keyword(s):  
Symmetry Breaking ◽  
Point Group ◽  
X Ray Diffraction ◽  
Multiple Diffraction ◽  
Space Groups ◽  
Atomic Displacements ◽  
Small Probe ◽  
Phase Sensitive ◽  
Convergent Beam

Convergent Beam Electron Diffraction is now almost routinely used in the determination of the point- and space-groups of crystalline samples. In addition to its small-probe capability, CBED is also postulated to be more sensitive than X-ray diffraction in determining crystal symmetries. Multiple diffraction is phase-sensitive, so that the distinction between centro- and non-centro-symmetric space groups should be trivial in CBED: in addition, the stronger scattering of electrons may give a general increase in sensitivity to small atomic displacements. However, the sensitivity of CBED symmetry to the crystal point group has rarely been quantified, and CBED is also subject to symmetry-breaking due to local strains and inhomogeneities. The purpose of this paper is to classify the various types of symmetry-breaking, present calculations of the sensitivity, and illustrate symmetry-breaking by surface strains.CBED symmetry determinations usually proceed by determining the diffraction group along various zone axes, and hence finding the point group. The diffraction group can be found using either the intensity distribution in the discs

Centrosome Aurora A gradient ensures single polarity axis in C. elegans embryos

2020 ◽  
Vol 48 (3) ◽  
pp. 1243-1253 ◽  
Author(s):  
Sukriti Kapoor ◽  
Sachin Kotak
Keyword(s):  
Symmetry Breaking ◽  
Cell Fate ◽  
Cell Cortex ◽  
Axis Formation ◽  
Aurora A Kinase ◽  
Aurora A ◽  
C Elegans ◽  
Cell Embryo ◽  
Polarity Establishment

Cellular asymmetries are vital for generating cell fate diversity during development and in stem cells. In the newly fertilized Caenorhabditis elegans embryo, centrosomes are responsible for polarity establishment, i.e. anterior–posterior body axis formation. The signal for polarity originates from the centrosomes and is transmitted to the cell cortex, where it disassembles the actomyosin network. This event leads to symmetry breaking and the establishment of distinct domains of evolutionarily conserved PAR proteins. However, the identity of an essential component that localizes to the centrosomes and promotes symmetry breaking was unknown. Recent work has uncovered that the loss of Aurora A kinase (AIR-1 in C. elegans and hereafter referred to as Aurora A) in the one-cell embryo disrupts stereotypical actomyosin-based cortical flows that occur at the time of polarity establishment. This misregulation of actomyosin flow dynamics results in the occurrence of two polarity axes. Notably, the role of Aurora A in ensuring a single polarity axis is independent of its well-established function in centrosome maturation. The mechanism by which Aurora A directs symmetry breaking is likely through direct regulation of Rho-dependent contractility. In this mini-review, we will discuss the unconventional role of Aurora A kinase in polarity establishment in C. elegans embryos and propose a refined model of centrosome-dependent symmetry breaking.

A Symmetry-Breaking Theory of False Pop Out

2011 ◽  
Author(s):  
Kimberley D. Orsten ◽  
Mary C. Portillo ◽  
James R. Pomerantz
Keyword(s):  
Symmetry Breaking
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