171 citations · 970 across the 28 of their papers we have counts for
29 papers
Extreme Localization via a Singular Edge Mode in an Asymmetric Linkage System
Myeonggyun Joo, Dongwook Kwak, Rajesh Chaunsali +2
Mechanical localized modes generally retain exponentially decaying tails, whereas confinement to a single structural unit is difficult to achieve without resonators, flat-band latt…
Single-particle limit of a topological edge state in a locally resonant band gap
Garigipati Sai Srikanth, Kai Qian, Ian Frankel +3
Topological metamaterials promise unprecedented wave control. Here, we theoretically and numerically investigate a one-dimensional Su-Schrieffer-Heeger (SSH)-inspired stiffness dim…
Wave propagation in an elastic lattice with non-reciprocal stiffness and engineered damping
Harshit Kumar Sandhu, Saurav Dutta, Rajesh Chaunsali
Nonreciprocal wave propagation allows for directional energy transport. In this work, we systematically investigate wave dynamics in an elastic lattice that combines nonreciprocal…
Nonlinearity-induced corner states in a kagome lattice
K Prabith, Georgios Theocharis, Rajesh Chaunsali
Nonlinearity provides a powerful mechanism for controlling energy localization in structured dynamical systems. In this study, we investigate the emergence of nonlinearity-induced…
Edge States with Hidden Topology in Spinner Lattices
Udbhav Vishwakarma, Murthaza Irfan, Georgios Theocharis +1
Symmetries -- whether explicit, latent, or hidden -- are fundamental to understanding topological materials. This work introduces a prototypical spring-mass model that extends beyo…
Remote Nucleation and Stationary Domain Walls via Transition Waves in Tristable Magnetoelastic Lattices
Anusree Ray, Samanvay Anand, Vivekanand Dabade +1
We present a magnetoelastic lattice in which a localized external magnetic field, generated by an assembly of fixed magnets, tunes the potential landscape to create monostable, bis…
Nonlinear Corner States in Topologically Nontrivial Kagome Lattice
K Prabith, Georgios Theocharis, Rajesh Chaunsali
We investigate a higher-order topological insulator (HOTI) under strong nonlinearity, focusing on the existence and stability of high-amplitude corner states, which can find applic…
Strain topological metamaterials
Florian Allein, Adamantios Anastasiadis, Rajesh Chaunsali +4
Topological physics has revolutionised materials science, introducing topological insulators and superconductors with applications from smart materials to quantum computing. Bulk-b…
Topological phase transition in disordered elastic quantum spin Hall system
Xiaotian Shi, Rajesh Chaunsali, Georgios Theocharis +3
We investigate the effect of disorder on topologically nontrivial states in a two dimension (2D) mechanical system. We first propose a quantum spin Hall (QSH) insulator based on an…
Dirac Solitons and Topological Edge States in the -Fermi-Pasta-Ulam-Tsingou dimer lattice
Rajesh Chaunsali, Panayotis G. Kevrekidis, Dimitri Frantzeskakis +1
We consider a dimer lattice of the Fermi-Pasta-Ulam-Tsingou (FPUT) type, where alternating linear couplings have a controllably small difference, and the cubic nonlinearity (-FP…
Duality of Topological Edge States in a Mechanical Kitaev Chain
Florian Allein, Rajesh Chaunsali, Adamantios Anastasiadis +4
We theoretically investigate and experimentally demonstrate the existence of topological edge states in a mechanical analog of the Kitaev chain with a non-zero chemical potential.…
Bulk-edge correspondence in the trimer Su-Schrieffer-Heeger model
Adamantios Anastasiadis, Georgios Styliaris, Rajesh Chaunsali +2
A remarkable feature of the trimer Su-Schrieffer-Heeger (SSH3) model is that it supports localized edge states. Although Zak's phase remains quantized for the case of a mirror-symm…
Topological state transfer in Kresling origami
Yasuhiro Miyazawa, Chun-Wei Chen, Rajesh Chaunsali +4
Topological mechanical metamaterials have been widely explored for their boundary states, which can be robustly isolated or transported in a controlled manner. However, such system…
Nonlinear Topological Edge States: from Dynamic Delocalization to Thermalization
Bertin Many Manda, Rajesh Chaunsali, Georgios Theocharis +1
We consider a mechanical lattice inspired by the Su-Schrieffer-Heeger model along with cubic Klein-Gordon type nonlinearity. We investigate the long-time dynamics of the nonlinear…
Disorder-induced topological phase transition in a 1D mechanical system
Xiaotian Shi, Ioannis Kiorpelidis, Rajesh Chaunsali +3
We numerically investigate the topological phase transition induced purely by disorder in a spring-mass chain. We employ two types of disorders - chiral and random types - to explo…
Stability of topological edge states under strong nonlinear effects
Rajesh Chaunsali, Haitao Xu, Jinkyu Yang +2
We examine the role of strong nonlinearity on the topologically-robust edge state in a one-dimensional system. We consider a chain inspired from the Su-Schrieffer-Heeger model, but…
Corner states in second-order mechanical topological insulator
Chun-Wei Chen, Rajesh Chaunsali, Johan Christensen +2
We numerically and experimentally study corner states in a continuous elastic plate with em-bedded bolts in a hexagonal pattern. While preserving C6 crystalline symmetry, the syste…
Elastic Weyl points and surface arc states in 3D structures
Xiaotian Shi, Rajesh Chaunsali, Feng Li +1
The study of Weyl points in electronic systems has inspired many recent researches in classical systems such as photonic and acoustic lattices. Here we show how the Weyl physics ca…
Mechanical analogue of a Majorana bound state
Chun-Wei Chen, Natalia Lera, Rajesh Chaunsali +5
The discovery of topologically non-trivial electronic systems has opened a new age in condensed matter research. From topological insulators to topological superconductors and Weyl…
Gradient-index granular crystals: From boomerang motion to asymmetric transmission of waves
Eunho Kim, Rajesh Chaunsali, Jinkyu Yang
We present a gradient-index crystal that offers extreme tunability in terms of manipulating the propagation of elastic waves. For small-amplitude excitations, we achieve control ov…
Self-induced topological transition in phononic crystals by nonlinearity management
Rajesh Chaunsali, Georgios Theocharis
A new design paradigm of topology has recently emerged to manipulate the flow of phonons. At its heart lies a topological transition to a nontrivial state with exotic properties. T…
Experimental demonstration of topological waveguiding in elastic plates with local resonators
Rajesh Chaunsali, Chun-Wei Chen, Jinkyu Yang
It is recent that the emergence of topological insulators in condensed matter physics has inspired analogous wave phenomena in mechanical systems, mostly in the setting of discrete…
Elastic Wannier-Stark Ladders and Bloch Oscillations in 1D Granular Crystals
Xiaotian Shi, Rajesh Chaunsali, Ying Wu +1
We report the numerical and experimental study of elastic Wannier-Stark Ladders and Bloch Oscillations in a tunable one-dimensional granular chain consisting of cylindrical particl…
Dial-in Topological Metamaterials Based on Bistable Stewart Platform
Ying Wu, Rajesh Chaunsali, Hiromi Yasuda +2
Recently, there have been significant efforts to guide mechanical energy in structures by relying on a novel topological framework popularized by the discovery of topological insul…