13 papers
Second order Josephson effect in excitonic insulators
Zhiyuan Sun, Tatsuya Kaneko, Denis Golež +1
We show that in electron-hole bilayers with excitonic order arising from conduction and valence bands formed by atomic orbitals that have different parities, nonzero interlayer tun…
Bulk Photovoltaic Effect Driven by Collective Excitations in a Correlated Insulator
Tatsuya Kaneko, Zhiyuan Sun, Yuta Murakami +2
We investigate the bulk photovoltaic effect, which rectifies light into electric current, in a collective quantum state with correlation driven electronic ferroelectricity. We show…
Topological charge pumping in excitonic insulators
Zhiyuan Sun, Andrew J. Millis
We show that in excitonic insulators with -wave electron-hole pairing, an applied electric field (either pulsed or static) can induce a -wave component to the order parameter…
Nonlinear spectroscopy of collective modes in excitonic insulator
Denis Golez, Zhiyuan Sun, Yuta Murakami +2
The nonlinear optical response of an excitonic insulator coupled to lattice degrees of freedom is shown to depend in strong and characteristic ways on whether the insulating behavi…
Graphene/-RuCl: An Emergent 2D Plasmonic Interface
Daniel J. Rizzo, Bjarke S. Jessen, Zhiyuan Sun +16
Work function-mediated charge transfer in graphene/-RuCl heterostructures has been proposed as a strategy for generating highly-doped 2D interfaces. In this geometry, graphe…
Bardasis-Schrieffer polaritons in excitonic insulators
Zhiyuan Sun, Andrew J. Millis
Bardasis-Schrieffer modes in superconductors are fluctuations in subdominant pairing channels, e.g., d-wave fluctuations in an s-wave superconductor. This Rapid Communication shows…