898 citations · 3.3k across the 18 of their papers we have counts for
18 papers
Dual Gauge Theory for Two Dimensional Superfluid Turbulence
Tobias Helbig, Sayak Bhattacharjee, Srinivas Raghu
We describe turbulent hydrodynamics of superfluids in two spatial dimensions via the dynamics of point-like vortices coupled to an emergent 2+1 dimensional gauge field. The…
Momentum-Space Entanglement Signatures and Spinon Breakdown in the - Zig-Zag Heisenberg Chain
Tom Oeffner, Ludwig Bordfeldt, Andreas Feuerpfeil +5
We investigate the resilience of spinon quasiparticles in the - zig-zag spin chain () from the viewpoint of momentum-space entanglement. For small , we show t…
Superconductivity and magnetism in bilayer nickelates: itinerant perspective
Yi-Ming Wu, Tobias Helbig, Salahudin V. Smailagić +4
We study superconductivity and magnetism in bilayer nickelates from an itinerant perspective. Starting from a tight binding fit to recent ARPES measurements on compressively strain…
Origin of Spin Stripes in Bilayer Nickelate LaNiO
Hao-Xin Wang, Hanbit Oh, Tobias Helbig +7
The bilayer nickelate LaNiO has recently emerged as a high-temperature superconductor with unusual spin stripe order in its ambient pressure phase. We propose a microsc…
How pairing mechanism dictates topology in valley-polarized superconductors with Berry curvature
Julian May-Mann, Tobias Helbig, Trithep Devakul
We investigate how the pairing mechanism influences topological superconductivity in valley-polarized systems with Berry curvature. We demonstrate that short-range attractive inter…
Theory of Eigenstate Thermalisation
Tobias Helbig, Tobias Hofmann, Ronny Thomale +1
If we prepare an isolated, interacting quantum system in an eigenstate and perturb a local observable at an initial time, its expectation value will relax towards a thermal expecta…
Realizing efficient topological temporal pumping in electrical circuits
Alexander Stegmaier, Hauke Brand, Stefan Imhof +11
Quantized adiabatic transport can occur when a system is slowly modulated over time. In most realizations however, the efficiency of such transport is reduced by unwanted dissipati…
Observation of cnoidal wave localization in non-linear topolectric circuits
Hendrik Hohmann, Tobias Hofmann, Tobias Helbig +12
We observe a localized cnoidal (LCn) state in an electric circuit network. Its formation derives from the interplay of non-linearity and the topology inherent to a Su-Schrieffer-He…
Hyperbolic Matter in Electrical Circuits with Tunable Complex Phases
Anffany Chen, Hauke Brand, Tobias Helbig +11
Curved spaces play a fundamental role in many areas of modern physics, from cosmological length scales to subatomic structures related to quantum information and quantum gravity. I…
Simulating hyperbolic space on a circuit board
Patrick M. Lenggenhager, Alexander Stegmaier, Lavi K. Upreti +12
The Laplace operator encodes the behavior of physical systems at vastly different scales, describing heat flow, fluids, as well as electric, gravitational, and quantum fields. A ke…
Topological defect engineering and PT-symmetry in non-Hermitian electrical circuits
Alexander Stegmaier, Stefan Imhof, Tobias Helbig +14
We employ electric circuit networks to study topological states of matter in non-Hermitian systems enriched by parity-time symmetry and chiral symmetry anti-$\mathca…
Efficient Light Funneling based on the non-Hermitian Skin Effect
Sebastian Weidemann, Mark Kremer, Tobias Helbig +5
In the last two decades, the ubiquitous effect of dissipation has proven to entail astonishing non-Hermitian features, rather than just being an inescapable nuisance. As an alterna…
Reciprocal skin effect and its realization in a topolectrical circuit
Tobias Hofmann, Tobias Helbig, Frank Schindler +11
A system is non-Hermitian when it exchanges energy with its environment and non-reciprocal when it behaves differently upon the interchange of input and response. Within the field…
Observation of bulk boundary correspondence breakdown in topolectrical circuits
Tobias Helbig, Tobias Hofmann, Stefan Imhof +7
The study of the laws of nature has traditionally been pursued in the limit of isolated systems, where energy is conserved. This is not always a valid approximation, however, as th…
Imaging nodal knots in momentum space through topolectrical circuits
Ching Hua Lee, Amanda Sutrisno, Tobias Hofmann +7
Knots are intricate structures that cannot be unambiguously distinguished with any single topological invariant. Momentum space knots, in particular, have been elusive due to their…
Tomonaga-Luttinger liquid in the edge channels of a quantum spin Hall insulator
R. Stühler, F. Reis, T. Müller +5
Topological quantum matter is characterized by non-trivial global invariants of the bulk which induce gapless electronic states at its boundaries. A case in point are two-dimension…
Chiral voltage propagation in a self-calibrated topolectrical Chern circuit
Tobias Hofmann, Tobias Helbig, Ching Hua Lee +2
We propose an electric circuit array with topologically protected uni-directional voltage modes at its boundary. Instead of external bias fields or floquet engineering, we employ n…
Band structure engineering and reconstruction in electric circuit networks
Tobias Helbig, Tobias Hofmann, Ching Hua Lee +4
We develop an approach to design, engineer, and measure band structures in a synthetic crystal composed of electric circuit elements. Starting from the nodal analysis of a circuit…