scholarly journals Edge States and Topological Phase Transitions in Chains of Dielectric Nanoparticles

Small ◽  
2017 ◽  
Vol 13 (11) ◽  
pp. 1603190 ◽  
Author(s):  
Sergey Kruk ◽  
Alexey Slobozhanyuk ◽  
Denitza Denkova ◽  
Alexander Poddubny ◽  
Ivan Kravchenko ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Topological Phase ◽  
Edge States ◽  
Topological Phase Transitions

scholarly journals Observing multifarious topological phase transitions with real-space indicator

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yong-Heng Lu ◽  
Yao Wang ◽  
Feng Mei ◽  
Yi-Jun Chang ◽  
Hang Zheng ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Three Dimensional ◽  
Real Space ◽  
Second Order ◽  
Topological Phases ◽  
Topological Phase ◽  
Edge States ◽  
Direct Writing ◽  
Topological Features ◽  
Topological Phase Transitions

Abstract First- and second-order topological phases, capable of inherent protection against disorder of materials, have been recently experimentally demonstrated in various artificial materials through observing the topologically protected edge states. Topological phase transition represents a new class of quantum critical phenomena, which is accompanied by the changes related to the bulk topology of energy band structures instead of symmetry. However, it is still a challenge to directly observe the topological phase transitions defined in terms of bulk states. Here, we theoretically and experimentally demonstrate the direct observation of multifarious topological phase transitions with real-space indicator in a single photonic chip, which is formed by integration of 324 × 33 waveguides supporting both first- and second-order topological phases. The trivial-to-first-order, trivial-to-second-order and first-to-second-order topological phase transitions signified by the band gap closure can all be directly detected via photon evolution in the bulk. We further observe the creation and destruction of gapped topological edge states associated with these topological phase transitions. The bulk-state-based route to investigate the high-dimensional and high-order topological features, together with the platform of freely engineering topological materials by three-dimensional laser direct writing in a single photonic chip, opens up a new avenue to explore the mechanisms and applications of artificial devices.

scholarly journals Topological Edge States and Transport Properties in Zigzag Stanene Nanoribbons with Magnetism

2021 ◽  
Author(s):  
Xiaolong Lü ◽  
Hang Xie
Keyword(s):  
Phase Transitions ◽  
Electric Field ◽  
Transport Properties ◽  
Magnetic Phase ◽  
Edge State ◽  
Magnetic Phase Transitions ◽  
Topological Phase ◽  
Edge States ◽  
Spin Polarized ◽  
Topological Phase Transitions

Abstract In this work, we investigate the topological phase transitions and corresponding transport properties in zigzag stanene nanoribbon with different magnetism. The results show that the off-resonant circularly polarized (ORCP) light may induce anisotropic chiral edge state with a magnetic phase transition from antiferromagnetic state to nonmagnetic state. In combination with the ORCP light and electric field, the 100% spin-polarized edge state can be induced with some magnetic orders. The finite-size effect is also an important factor for the magnetic phase transitions, which in turn induces topological phase transitions from the band insulator to topological phases. By constructing the topological-insulator junctions with some topological edge states, we further study the Fabry-Perot resonant, where multiple reflection edge states cause strong current loops. By modulating the ORCP and electric field, the system can also be regarded as a switcher, to control the charge current or spin polarized current. These findings pave a way for designing topological device with magnetic edges in the future nano spintronics.

scholarly journals Creating polar antivortex in PbTiO3/SrTiO3 superlattice

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Adeel Y. Abid ◽  
Yuanwei Sun ◽  
Xu Hou ◽  
Congbing Tan ◽  
Xiangli Zhong ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Phase Field ◽  
Driving Force ◽  
Topological Phase ◽  
Phase Field Simulation ◽  
Topological Structures ◽  
Field Simulation ◽  
Condensed Matters ◽  
Topological Phase Transitions ◽  
Insight Into

AbstractNontrivial topological structures offer a rich playground in condensed matters and promise alternative device configurations for post-Moore electronics. While recently a number of polar topologies have been discovered in confined ferroelectric PbTiO3 within artificially engineered PbTiO3/SrTiO3 superlattices, little attention was paid to possible topological polar structures in SrTiO3. Here we successfully create previously unrealized polar antivortices within the SrTiO3 of PbTiO3/SrTiO3 superlattices, accomplished by carefully engineering their thicknesses guided by phase-field simulation. Field- and thermal-induced Kosterlitz–Thouless-like topological phase transitions have also been demonstrated, and it was discovered that the driving force for antivortex formation is electrostatic instead of elastic. This work completes an important missing link in polar topologies, expands the reaches of topological structures, and offers insight into searching and manipulating polar textures.

scholarly journals Interaction-driven topological phase transitions in fermionic SU(3) systems

2020 ◽  
Vol 101 (24) ◽  
Author(s):  
Mohsen Hafez-Torbati ◽  
Jun-Hui Zheng ◽  
Bernhard Irsigler ◽  
Walter Hofstetter
Keyword(s):  
Phase Transitions ◽  
Topological Phase ◽  
Topological Phase Transitions
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