scholarly journals Flat bands and nontrivial topological properties in an extended Lieb lattice

2019 ◽  
Vol 100 (23) ◽  
Author(s):  
Ankita Bhattacharya ◽  
Biplab Pal
Keyword(s):  
Topological Properties ◽  
Flat Bands ◽  
Lieb Lattice

Critical topological nodal points and nodal lines/rings in Kagome graphene

2020 ◽  
Vol 22 (16) ◽  
pp. 8713-8718
Author(s):  
Jun Zhou ◽  
Yuee Xie ◽  
Shengbai Zhang ◽  
Yuanping Chen
Keyword(s):  
Transport Phenomena ◽  
Topological Phases ◽  
Topological Properties ◽  
Many Body ◽  
Body Effect ◽  
Nodal Lines ◽  
Flat Bands ◽  
Nodal Points

Critical topological phases, possessing flat bands, provide a platform to study unique topological properties and transport phenomena under a many-body effect.

Optical and magnetic control of orbital flat bands in a polariton Lieb lattice

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
C. E. Whittaker ◽  
D. R. Gulevich ◽  
D. Biegańska ◽  
B. Royall ◽  
E. Clarke ◽  
...  
Keyword(s):  
Magnetic Control ◽  
Flat Bands ◽  
Lieb Lattice

scholarly journals Optical spectral weight, phase stiffness, and Tc bounds for trivial and topological flat band superconductors

2021 ◽  
Vol 118 (34) ◽  
pp. e2106744118 ◽  
Author(s):  
Nishchhal Verma ◽  
Tamaghna Hazra ◽  
Mohit Randeria
Keyword(s):  
Quantum Monte Carlo ◽  
Mean Field ◽  
Spectral Weight ◽  
Upper Bounds ◽  
Flat Band ◽  
Wannier Functions ◽  
Flat Bands ◽  
Flux Model ◽  
Lieb Lattice ◽  
Insight Into

We present exact results that give insight into how interactions lead to transport and superconductivity in a flat band where the electrons have no kinetic energy. We obtain bounds for the optical spectral weight for flat-band superconductors that lead to upper bounds for the superfluid stiffness and the two-dimensional (2D) Tc. We focus on on-site attraction |U| on the Lieb lattice with trivial flat bands and on the π-flux model with topological flat bands. For trivial flat bands, the low-energy optical spectral weight D̃low≤ñ|U|Ω/2 with ñ=minn,2−n , where n is the flat-band density and Ω is the Marzari–Vanderbilt spread of the Wannier functions (WFs). We also obtain a lower bound involving the quantum metric. For topological flat bands, with an obstruction to localized WFs respecting all symmetries, we again obtain an upper bound for D̃low linear in |U|. We discuss the insights obtained from our bounds by comparing them with mean-field and quantum Monte Carlo results.

Ag2S Monolayer: an Ultrasoft Inorganic Lieb Lattice

Nanoscale ◽  
2021 ◽  
Author(s):  
Tong Yang ◽  
Yong Zheng Luo ◽  
Zishen Wang ◽  
Tao Zhu ◽  
Hui Pan ◽  
...  
Keyword(s):  
Square Lattice ◽  
Two Dimensional ◽  
Topological Properties ◽  
Lieb Lattice

Lieb lattice, a two-dimensional edge-centered square lattice, has attracted considerable interest due to its exotic electronic and topological properties. Although various optical and photonic Lieb lattices have been experimentally demonstrated,...

Electron Microscopy of Nucleic Acids

1974 ◽  
Vol 32 ◽  
pp. 302-303
Author(s):  
Norman Davidson
Keyword(s):  
Electron Microscopy ◽  
Nucleic Acids ◽  
Basic Protein ◽  
Molecular Biologist ◽  
Topological Properties ◽  
Protein Film ◽  
Polynucleotide Chain

The basic protein film technique for mounting nucleic acids for electron microscopy has proven to be a general and powerful tool for the working molecular biologist in characterizing different nucleic acids. It i s possible to measure molecular lengths of duplex and single-stranded DNAs and RNAs. In particular, it is thus possible to as certain whether or not the nucleic acids extracted from a particular source are or are not homogeneous in length. The topological properties of the polynucleotide chain (linear or circular, relaxed or supercoiled circles, interlocked circles, etc. ) can also be as certained.

The Effect of Topological Properties on Duration Perception of Oddball Stimuli

2013 ◽  
Vol 45 (12) ◽  
pp. 1324-1333
Author(s):  
Baolin LI ◽  
Youguo CHEN ◽  
Xiangyong YUAN ◽  
Jackson Todd ◽  
Xiting HUANG
Keyword(s):  
Topological Properties

Molecular Topological Properties of Alkylating Agents Based Anticancer Drug Candidates Via Some Ve-degree Topological Indices

2020 ◽  
Vol 16 (2) ◽  
pp. 190-195 ◽  
Author(s):  
Süleyman Ediz ◽  
Murat Cancan
Keyword(s):  
Anticancer Drugs ◽  
Anticancer Drug ◽  
Alkylating Agents ◽  
Topological Indices ◽  
Pharmacological Properties ◽  
Topological Properties ◽  
Drug Candidates ◽  
New Drug ◽  
Atom Bond ◽  
Dual Target

Background: Reckoning molecular topological indices of drug structures gives the data about the underlying topology of these drug structures. Novel anticancer drugs have been leading by researchers to produce ideal drugs. Materials and Methods: Pharmacological properties of these new drug agents explored by utilizing simulation strategies. Topological indices additionally have been utilized to research pharmacological properties of some drug structures. Novel alkylating agents based anticancer drug candidates and ve-degree molecular topological indices have been introduced recently. Results and Conclusion: In this study we calculate ve-degree atom-bond connectivity, harmonic, geometric-arithmetic and sum-connectivity molecular topological indices for the newly defined alkylating agents based dual-target anticancer drug candidates.

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