167 citations · 509 across the 16 of their papers we have counts for
16 papers
Vortex-enhanced photovoltaic current in disordered topological materials
Pavlo Sukhachov, Penghao Zhu, Ella Banyas +2
In disordered topological materials, real-space crystalline defects interplay with momentum-space wave function singularities to \textit{enhance} the bulk photovoltaic current. Wha…
General Conditions for Axis Dependent Conduction Polarity
Poulomi Chakraborty, Brian Skinner, Penghao Zhu
Axis-Dependent Conduction Polarity (ADCP) refers to the phenomenon in which electrical transport within a single material is p-type along one crystallographic direction and n-type…
Giant non-reciprocity and gyration through modulation-induced Hatano-Nelson coupling in integrated photonics
Ogulcan E. Orsel, Jiho Noh, Penghao Zhu +4
Asymmetric energy exchange interactions, also known as Hatano-Nelson type couplings, enable the study of non-Hermitian physics and associated phenomena like the non-Hermitian skin…
Stripe charge order driven manipulation of Majorana bound states in 2M-WS2 topological superconductor
Xuemin Fan, Xiaoqi Sun, Penghao Zhu +8
Majorana bound states (MBSs) are building blocks for topological quantum computing. They can be generated via the combination of electronic topology and superconductivity. To achie…
Delicate Topology of Luttinger Semimetal
Penghao Zhu, Rui-Xing Zhang
Recent advances in delicate topology have expanded the classification of topological bands, but its presence in solid-state materials remains elusive. Here we show that delicate to…
Anomalous shift and optical vorticity in the steady photovoltaic current
Penghao Zhu, A. Alexandradinata
Steady illumination of a non-centrosymmetric semiconductor results in a bulk photovoltaic current, which is contributed by real-space displacements (`shifts') of charged quasiparti…
Spin-momentum Locking and Topological Vector Charge Response with Conserved Spin
Yoonseok Hwang, Penghao Zhu, Taylor L. Hughes
Spin-momentum locking plays a fundamental role in spintronics and, more broadly, is an important concept in condensed matter physics. In 2D and 3D, spin-momentum locking typically…
Scattering theory of delicate topological insulators
Penghao Zhu, Jiho Noh, Yingkai Liu +1
We study the scattering theory of delicate topological insulators (TIs), which are novel topological phases beyond the paradigm of the tenfold way, topological quantum chemistry, a…
Spin Hopf Insulator: Helical Hinge States and Returning Thouless Pump
Penghao Zhu, A. Alexandradinata, Taylor L. Hughes
We introduce a time-reversal-symmetric analog of the Hopf insulator that we call a spin Hopf insulator. The spin Hopf insulator harbors nontrivial Kane-Mele invariants on it…
Higher rank chirality and non-Hermitian skin effect in a topolectrical circuit
Penghao Zhu, Xiao-Qi Sun, Taylor L. Hughes +1
While chirality imbalances are forbidden in conventional lattice systems, non-Hermiticity can effectively avoid the chiral-doubling theorem to facilitate 1D chiral dynamics. Indeed…
Multi-gap topology of the Wilson loop operator in mirror symmetric insulators
Penghao Zhu, Taylor L. Hughes, Xiao-Qi Sun
We study the multi-gap topology of the periodic spectra of Wilson loop operators (WLOs) in mirror symmetric insulators. We develop two topological invariants each associated with a…
Evidence for Higher order topology in Bi and BiSb
Leena Aggarwal, Penghao Zhu, Taylor L. Hughes +1
Higher order topological insulators (HOTIs) are a new class of topological materials which host protected states at the corners or hinges of a crystal. HOTIs provide an intriguing…
Geometric Response and Disclination-Induced Skin Effects in Non-Hermitian Systems
Xiao-Qi Sun, Penghao Zhu, Taylor L. Hughes
We study the geometric response of three-dimensional non-Hermitian crystalline systems with nontrivial point-gap topology. For systems with fourfold rotation symmetry, we show that…
Quantized surface magnetism and higher-order topology: Application to the Hopf insulator
Penghao Zhu, Taylor L. Hughes, A. Alexandradinata
We identify topological aspects of the subextensive magnetic moment contributed by the surfaces of a three-dimensional crystallite -- assumed to be insulating in the bulk as well a…
Identifying Higher Order Topology and Fractional Corner Charge Using Entanglement Spectra
Penghao Zhu, Kieran Loehr, Taylor L. Hughes
We study the entanglement spectrum (ES) of two-dimensional -symmetric second-order topological insulators (TIs). We show that some characteristic higher order topological ob…
Fractional disclination charge in two-dimensional symmetric topological crystalline insulators
Tianhe Li, Penghao Zhu, Wladimir A. Benalcazar +1
Robust fractional charge localized at disclination defects has been recently found as a topological response in symmetric 2D topological crystalline insulators (TCIs). In t…