13 citations · 40 across the 14 of their papers we have counts for
14 papers
Half-quantized anomalous Hall conductance in topological insulator/ferromagnet van der Waals heterostructures
Shahid Sattar, Roman Stepanov, Alexander Tyner +3
The half-quantized anomalous Hall conductance (AHC) in topological materials is a condensed matter physics realization of the parity anomaly of (2+1) quantum field theory and an im…
Nonlinear Hall Effect in KTaO Two-Dimensional Electron Gases
Patrick W. Krantz, Alexander Tyner, Pallab Goswami +1
The observation of a Hall effect, a finite transverse voltage induced by a longitudinal current, usually requires the breaking of time-reversal symmetry, for example through the ap…
Intrinsic magnetism in KTaO heterostructures
Patrick W. Krantz, Alexander Tyner, Pallab Goswami +1
There has been intense recent interest in the two-dimensional electron gases (2DEGs) that form at the surfaces and interfaces of KTaO (KTO), with the discovery of superconducti…
Solitons and real-space screening of bulk topology of quantum materials
Alexander C. Tyner, Pallab Goswami
Recent years have seen multiple high-throughput studies reveal an immense number of topological materials through use of symmetry indicators. Despite this success, three-dimensiona…
Fundamentals of crystalline Hopf insulators
Yuxin Wang, Alexander C. Tyner, Pallab Goswami
Three-dimensional, crystalline Hopf insulators are generic members of unitary Wigner-Dyson class, which can break all global discrete symmetries and point group symmetries. In the…
Dipolar Weyl semimetals
Alexander C. Tyner, Shouvik Sur
In time-reversal symmetry-broken Weyl semimetals, Weyl points act as monopoles and antimonopoles of the Berry curvature, with a monopole-antimonopole pair producing a net zero Berr…
Spin-charge separation and quantum spin Hall effect of -bismuthene
Alexander C. Tyner, Pallab Goswami
Field theory arguments suggest the possibility of -classification of quantum spin Hall effect with magnetic flux tubes, that cause separation of spin and charge degrees…
Colossal Spontaneous Hall Effect and Emergent Magnetism in KTaO Two-Dimensional Electron Gases
Patrick Krantz, Alex Tyner, Pallab Goswami +1
There has been intense recent interest in the two-dimensional electron gases (2DEGs) that form at the surfaces and interfaces of KTaO (KTO), with the discovery of superconducti…
Part II: Witten effect and -classification of axion angle
Alexander C. Tyner, Pallab Goswami
The non-trivial third homotopy class of three-dimensional topological insulators leads to quantized, magneto-electric coefficient or axion angle , with .…
Mixed-order topology of Benalcazar-Bernevig-Hughes models
Shouvik Sur, Alexander C. Tyner, Pallab Goswami
Benalcazar-Bernevig-Hughes (BBH) models, defined on -dimensional simple cubic lattice, are paradigmatic toy models for studying -th order topology and corner-localized, mid-g…
Part I: Staggered index and 3D winding number of Kramers-degenerate bands
Alexander C. Tyner, Pallab Goswami
For three-dimensional (3D) crystalline insulators, preserving space-inversion () and time-reversal () symmetries, the third homotopy class of two-fold, Kr…
Mechanism of skyrmion condensation and pairing for twisted bi-layer graphene
Dian Jing, Alexander Conkey Tyner, Pallab Goswami
When quantum flavor Hall insulator phases of itinerant fermions are disordered by strong quantum fluctuations, the condensation of skyrmion textures of order parameter fields can l…
Non-Abelian Stokes theorem and quantized Berry flux
Alexander C. Tyner, Shouvik Sur, Qunfei Zhou +4
Band topology of anomalous quantum Hall insulators can be precisely addressed by computing Chern numbers of constituent non-degenerate bands that describe quantized, Abelian Berry…
Topology of three-dimensional Dirac semimetals and generalized quantum spin Hall systems without gapless edge modes
Alexander C. Tyner, Shouvik Sur, Danilo Puggioni +2
Usually the quantum spin Hall states are expected to possess gapless, helical edge modes. Are there clean, non-interacting, quantum spin Hall states without gapless, edge modes? We…