4 papers
Topological magnetic textures in magnetic topological insulators
Nisarga Paul, Liang Fu
The surfaces of intrinsic magnetic topological insulators (TIs) host magnetic moments exchange-coupled to Dirac electrons. We study the magnetic phases arising from tuning the elec…
The Soft -Matrix in Gravity
Elizabeth Himwich, Sruthi A. Narayanan, Monica Pate +2
The gravitational -matrix defined with an infrared (IR) cutoff factorizes into hard and soft factors. The soft factor is universal and contains all the IR and collinea…
Quantum Diffusion in the Strong Tunneling Regime
Nisarga Paul, Ariel Amir
We study the spread of a quantum-mechanical wavepacket in a noisy environment, modeled using a tight-binding Hamiltonian. Despite the coherent dynamics, the fluctuating environment…
Infrared Finiteness and Forward Scattering
Christopher Frye, Holmfridur Hannesdottir, Nisarga Paul +2
Infrared divergences have long been heralded to cancel in sufficiently inclusive cross-sections, according to the famous Kinoshita-Lee-Nauenberg theorem which mandates an initial a…