6 papers
Ballistic-to-diffusive transition in engineered counter-propagating quantum Hall channels
Aifei Zhang, Kenji Watanabe, Takashi Taniguchi +4
Exotic quantum Hall systems hosting counter-propagating edge states can show seemingly non-universal transport regimes, usually depending on the size of the sample. We experimental…
Breakdown of the Wiedemann-Franz law in an interacting quantum Hall metamaterial
Patrice Roche, Carles Altimiras, François D. Parmentier +1
Coulomb interactions deeply affect quantum transport in simple ballistic systems, but their impact on scaled up ballistic structures remains underexplored. Here we theoretically co…
Quantized heat flow in the Hofstadter butterfly
Aifei Zhang, Gibril Aissani, Quan Dong +11
When subjected to a strong magnetic field, electrons on a two-dimensional lattice acquire a fractal energy spectrum called Hofstadter's butterfly. In addition to its unique recursi…
Testing Kubo formula on a nonlinear quantum conductor driven far from equilibrium via power exchanges
Zubair Iftikhar, Jonas Müller, Yuri Mukharsky +3
We present an experimental test of Kubo formula performed on a nonlinear quantum conductor, a Superconductor-Insulator-Superconductor tunnel junction, driven far from equilibrium b…
Non-universal localization transition in the quantum Hall effect probed through broken-symmetry states of graphene
Aifei Zhang, Torsten Röper, Manjari Garg +7
The quantum Hall effect hosts quantum phase transitions in which the localization length, that is the size of disorder-induced bulk localized states, is governed by universal scali…
Absence of a dissipative quantum phase transition in Josephson junctions: Theory
Carles Altimiras, Daniel Esteve, ÃaÄlar Girit +2
We investigate the resistively shunted Josephson junction (RSJ) at equilibrium, using linear response, an exact path integral technique and symmetry considerations. All three appro…