Conductance beyond the Landauer limit and charge pumping in quantum wires
arXiv:1202.6051 · doi:10.1103/PhysRevB.85.155425
Abstract
Periodically driven systems, which can be described by Floquet theory, have been proposed to show characteristic behavior that is distinct from static Hamiltonians. Floquet theory proposes to describe such periodically driven systems in terms of states that are indexed by a photon number in addition to the usual Hilbert space of the system. We propose a way to measure directly this additional Floquet degree of freedom by the measurement of the DC conductance of a single channel quantum point contact. Specifically, we show that a single channel wire augmented with a grating structure when irradiated with microwave radiation can show a DC conductance above the limit of one conductance quantum set by the Landauer formula. Another interesting feature of the proposed system is that being non-adiabatic in character, it can be used to pump a strong gate-voltage dependent photo-current even with linearly polarized radiation.
9 pages; 3 figures: Final published version; includes minor revisions from the last version
References in corpus (10)
- Floquet Topological Insulator in Semiconductor Quantum Wells
- Topological characterization of periodically-driven quantum systems
- Transport properties of non-equilibrium systems under the application of light: Photo-induced quantum Hall insulators without Landau levels
- Driven quantum transport on the nanoscale
- Tuning laser-induced bandgaps in graphene
- Single-parameter non-adiabatic quantized charge pumping
- Dictionary between scattering matrix and Keldysh formalisms for quantum transport driven by time-periodic fields
- Microwave photoconductivity of a 2D electron gas: Mechanisms and their interplay at high radiation power
- Theory of the microwave induced zero resistance states in two-dimensional electron systems
- Nonlinear Current of Strongly Irradiated Quantum Hall Gas