313 citations · 2k across the 83 of their papers we have counts for
85 papers
Quantum Theory Angular Momentum; Electronic version 2026
Niels R. Walet
This is an electronic version of the open source book "Quantum Theory of Angular Momentum" by D. A. Varshalovich, A. N. Moskalev, V. K. Khersonskii, original copyright \c{opyright}…
Topological phases of a generalised tripartite Haldane model
Ahmed Al-kharusi, Alessandro Principi, Niels R. Walet
We present a generalised tripartite Haldane model with a complex nearest neighbour hopping parameter. The total magnetic flux through the primitive unit cell, which consists of thr…
Giant atomic swirl in graphene bilayers with biaxial heterostrain
F. Mesple, N. R. Walet, G. Trambly de Laissardière +7
The study of moiré engineering started with the advent of van der Waals heterostructures in which stacking two-dimensional layers with different lattice constants leads to a moiré…
Calculation of Dynamical Response Functions Using a Bound-state Method
Niels R. Walet, Jagjit Singh, Johannes Kirscher +3
We investigate a method to extract response functions (dynamical polarisabilities) directly from a bound-state approach applied to calculations of perturbation-induced reactions. T…
Wannier Topology and Quadrupole Moments for a generalized Benalcazar-Bernevig-Hughes Model
Liu Yang, Alessandro Principi, Niels R. Walet
We analyze a special separable and chiral-symmetric model with a quantized quadrupole moment, extending the Benalcazar-Bernevig-Hughes model [Science 357, 61 (2017)]. Using nested-…
Electrostatic interactions in twisted bilayer graphene
Tommaso Cea, Pierre A. Pantaleón, Niels R. Walet +1
The effects of the long range electrostatic interaction in twisted bilayer graphene are described using the Hartree-Fock approximation. The results show a significant dependence of…