60 citations · 120 across the 7 of their papers we have counts for
7 papers
Quantum geometry and low-frequency optical conductivity of nodal planes
Raymond Wiedmann, Kirill Alpin, Moritz M. Hirschmann +1
Nodal planes, two-dimensional symmetry-enforced band crossings, can carry a topological charge, similar to Weyl points. While the transport properties of Weyl points are well under…
Fermi surface of the chiral topological semimetal CoSi
Nico Huber, Sanu Mishra, Ilya Sheikin +6
We report a study of the Fermi surface of the chiral semimetal CoSi and its relationship to a network of multifold topological crossing points,Weyl points, and topological nodal pl…
Perturbative description of high- superconductivity in the Hubbard model via unitary transformation and classical spins
Kirill Alpin
A unitary transformation is applied to the Hubbard model, which maps the Hubbard interaction to a single particle term. The resulting Hamiltonian consists of unconstrained fermions…
Fundamental laws of chiral band crossings: local constraints, global constraints, and topological phase diagrams
Kirill Alpin, Moritz M. Hirschmann, Niclas Heinsdorf +4
We derive two fundamental laws of chiral band crossings: (i) a local constraint relating the Chern number to phase jumps of rotation eigenvalues; and (ii) a global constraint deter…
Network of topological nodal planes, multifold degeneracies, and Weyl points in CoSi
Nico Huber, Kirill Alpin, Grace L. Causer +7
We report the identification of symmetry-enforced nodal planes (NPs) in CoSi providing the missing topological charges in an entire network of band-crossings comprising in addition…
Symmetry-enforced topological nodal planes at the Fermi surface of a chiral magnet
Marc A. Wilde, Matthias Dodenhöft, Arthur Niedermayr +5
Following over a decade of intense efforts to enable major progress in spintronics devices and quantum information technology by means of materials in which the electronic structur…
Realization of balanced gain and loss in a time-dependent four-mode Bose-Hubbard model
Daniel Dizdarevic, Jörg Main, Kirill Alpin +4
A quantum system exhibiting symmetry is a Bose-Einstein condensate in a double-well potential with balanced particle gain and loss, which is described in the mean-fi…