Results 21 to 30 of about 2,617,483 (275)
Topological insulators with inversion symmetry [PDF]
, 2006 Topological insulators are materials with a bulk excitation gap generated by the spin-orbit interaction that are different from conventional insulators. This distinction is characterized by ${Z}_{2}$ topological invariants, which characterize the ground ...
L. Fu, C. Kane
semanticscholar +1 more source
Generalization of Friedberg-Lee Symmetry [PDF]
, 2008 We study the possible origin of Friedberg-Lee symmetry. First, we propose the generalized Friedberg-Lee symmetry in the potential by including the scalar fields in the field transformations, which can be broken down to the FL symmetry spontaneously.
Chao-Shang Huang +6 more
core +2 more sources
Comprehensive search for topological materials using symmetry indicators [PDF]
Nature, 2018 Over the past decade, topological materials—in which the topology of electron bands in the bulk material leads to robust, unconventional surface states and electromagnetism—have attracted much attention.
F. Tang, H. Po, A. Vishwanath, X. Wan
semanticscholar +1 more source
Symmetry-preserving Observers [PDF]
, 2008 This paper presents three non-linear observers on three examples of engineering interest: a chemical reactor, a non-holonomic car, and an inertial navigation system. For each example, the design is based on physical symmetries.
Bonnabel, S., Martin, Ph., Rouchon, P.
core +3 more sources
A symmetry for vanishing cosmological constant [PDF]
, 2006 Two different realizations of a symmetry principle that impose a zero cosmological constant in an extra-dimensional set-up are studied. The symmetry is identified by multiplication of the metric by minus one. In the first realization of the symmetry this
't Hooft G +9 more
core +2 more sources
Symmetry-based indicators of band topology in the 230 space groups [PDF]
Nature Communications, 2017 The interplay between symmetry and topology leads to a rich variety of electronic topological phases, protecting states such as the topological insulators and Dirac semimetals.
H. Po, A. Vishwanath, Haruki Watanabe
semanticscholar +1 more source
(d-2)-Dimensional Edge States of Rotation Symmetry Protected Topological States. [PDF]
Physical Review Letters, 2017 We study fourfold rotation-invariant gapped topological systems with time-reversal symmetry in two and three dimensions (d=2, 3). We show that in both cases nontrivial topology is manifested by the presence of the (d-2)-dimensional edge states, existing ...
Zhida Song, Z. Fang, C. Fang
semanticscholar +1 more source
Peptide‐based ligand antagonists block a Vibrio cholerae adhesin
FEBS Letters, EarlyView.The structure of a peptide‐binding domain of the Vibrio cholerae adhesin FrhA was solved by X‐ray crystallography, revealing how the inhibitory peptide AGYTD binds tightly at its Ca2+‐coordinated pocket. Structure‐guided design incorporating D‐amino acids enhanced binding affinity, providing a foundation for developing anti‐adhesion therapeutics ...
Mingyu Wang +9 more
wiley +1 more source
Cytoplasmic p21 promotes stemness of colon cancer cells via activation of the NFκB pathway
Molecular Oncology, EarlyView.Cytoplasmic p21 promotes colorectal cancer stem cell (CSC) features by destabilizing the NFκB–IκB complex, activating NFκB signaling, and upregulating BCL‐xL and COX2. In contrast to nuclear p21, cytoplasmic p21 enhances spheroid formation and stemness transcription factor CD133.
Arnatchai Maiuthed +10 more
wiley +1 more source
On The Complexity and Completeness of Static Constraints for Breaking Row and Column Symmetry [PDF]
, 2010 We consider a common type of symmetry where we have a matrix of decision variables with interchangeable rows and columns. A simple and efficient method to deal with such row and column symmetry is to post symmetry breaking constraints like DOUBLELEX and ...
A. Frisch +13 more
core +4 more sources