Integrating Non-Abelianity in Euclidean lattices: From Cayley lattices to Circuit simulation

Objective

"Most condensed matter physics happens on lattices with commuting translations—move right then up equals up then right. But hyperbolic lattices break this: translations become non-Abelian (NAB) or non-commutative, bringing remarkable physics—novel phases from single particle to many-body, superior quantum error correction, enhanced AI memory. Problem: hyperbolic lattices need exponentially growing connections, impractical to scale. I propose Cayley lattices (CayLats): NAB translations in flat space without curvature. The trick is algebraic—replace each lattice site with n internal states corresponding to n group elements of Zn. The Hamiltonian splits into Abelian and NAB sectors in the same flat lattice. For Z2 CayLats, I've shown electric fields at different angles produce completely different spectra in NAB vs Abelian sectors—direct proof of non-commutativity without curved space. Higher Zn gets fascinating. Z3 and Z4 CayLats may break time-reversal in NAB sectors while preserving it in Abelian ones—impossible in regular lattices. Topological phases scale with my ""NABity parameter"" measuring translation non-commutativity. Larger n→more NABity→richer physics. Theory needs experiments. I construct CayLats using electrical circuits simulation—inductors/capacitors mimicking tight-binding models. Circuit Laplacian becomes Hamiltonian, impedances reveal spectra. LTSpice simulations show path-dependent impedances, NAB-specific boundary modes—ready for ETH's electronics lab. Impact: In quantum systems, photons between qubits get path-dependent coupling without external control. Same distance, different interaction based on route—fundamentally new. With supervisors Bzdušek (topological band theory) and Neupert (many-body physics) at UZH, we will showcase NAB physics does not need curved space, just algebra. CayLats show translation symmetry is not geometrically fixed—it's engineerable. That revolutionizes how we design materials with exotic properties in flat space."