Topological charge pumping in excitonic insulators

Abstract

We show that in excitonic insulators with $s$-wave electron-hole pairing, an applied electric field (either pulsed or static) can induce a $p$-wave component to the order parameter, and further drive it to rotate in the $s+ip$ plane, realizing a Thouless charge pump. In one dimension, each cycle of rotation pumps exactly two electrons across the sample. Higher dimensional systems can be viewed as a stack of one dimensional chains in momentum space in which each chain crossing the fermi surface contributes a channel of charge pumping. Physics beyond the adiabatic limit, including in particular dissipative effects is discussed.

arXiv comment5 pages, 4 figures

References in corpus (27)

• Double-slit photoelectron interference in strong-field ionization of the neon dimer
• Exciton-polariton condensates
• High-temperature superfluidity with indirect excitons in van der Waals heterostructures
• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• Signatures of exciton condensation in a transition metal dichalcogenide
• Excitonic superfluid phase in Double Bilayer Graphene
• Solitons and Rabi Oscillations in a Time-Dependent BCS Pairing Problem
• Ultrafast and reversible control of the exchange interaction in Mott insulators
• Gate-Tuned Spontaneous Exciton Insulator in Double-Quantum Wells
• Orthorhombic-to-Monoclinic Phase Transition of Ta2NiSe5 Induced by the Bose-Einstein Condensation of Excitons
• Evidence for a Monolayer Excitonic Insulator
• Theory of Electronic Ferroelectricity
• Coherent Order Parameter Oscillations in the Ground State of the Excitonic Insulator Ta2NiSe5
• Nature of symmetry breaking at the excitonic insulator transition: Ta${}_2$NiSe${}_5$
• Strong Coupling Nature of the Excitonic Insulator State in Ta${}_2$NiSe${}_5$
• Collective modes and terahertz near-field response of superconductors
• Reproduction of the charge density wave phase diagram in $1T$-${\mathrm{TiSe}}_2$ exposes its excitonic character
• Photo-induced gap closure in an excitonic insulator
• Universal Optical Control of Chiral Superconductors and Majorana Modes
• Collective Modes in Excitonic Insulators: Effects of Electron-Phonon Coupling and Signatures in Optical Response
• Exciton-phonon cooperative mechanism of the triple-$q$ charge-density-wave and antiferroelectric electron polarization in TiSe${}_2$
• Transient trapping into metastable states in systems with competing orders
• Topological charge pumping in twisted bilayer graphene
• Floquet topological phase of nondriven $p$-wave nonequilibrium excitonic insulators
• Fractional Excitonic Insulator
• Bardasis-Schrieffer polaritons in excitonic insulators
• Interacting topological mirror excitonic insulator in one dimension

Cited by in corpus (12)

• Strongly correlated excitonic insulator in atomic double layers
• Second order Josephson effect in excitonic insulators
• A New Era of Excitonic Insulators
• Topological excitonic corner states and nodal phase in bilayer quantum spin Hall insulators
• Dynamical exciton condensates in biased electron-hole bilayers
• Light-induced switching between singlet and triplet superconducting states
• Third-harmonic generation in excitonic insulators
• Floquet engineering of many-body states by the ponderomotive potential
• Transition to an excitonic insulator from a two-dimensional conventional insulator
• Fate of transient order parameter domain walls in ultrafast experiments
• Distinct topological excitonic insulators characterized by quantum geometry
• Ab initio Approach to Collective Excitations in Excitonic Insulators