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We introduce the concept of self-tuned criticality as a general mechanism for signal detection in sensory systems. In the case of hearing, we argue that active amplification of faint sounds is provided by a dynamical system that is maintained at the threshold of an oscillatory instability. This concept can account for the exquisite sensitivity of the… (More)

We study the dynamics of an elastic rod-like filament in two dimensions, driven by internally generated forces. This situation is motivated by cilia and flagella which contain an axoneme. These hair-like appendages of many cells are used for swimming and to stir surrounding fluids. Our approach characterizes the general physical mechanisms that govern the… (More)

We derive within a time-dependent scattering formalism expressions for both the current through ac-driven nanoscale conductors and its fluctuations. The results for the time-dependent current, its time average, and, above all, the driven shot-noise properties assume an explicit and serviceable form by relating the propagator to a non-Hermitian Floquet… (More)

The theory for current fluctuations in ac-driven transport through nanoscale systems is put forward. By use of a generalized, non-Hermitian Floquet theory we derive novel explicit expressions for the time-averaged current and the zero-frequency component of the power spectrum of current fluctuations. A distinct suppression of both the zero-frequency noise… (More)

Bundles of polar filaments which interact via active elements can exhibit complex dynamic behaviors. By using a simple and general description for the bundle dynamics, we find regimes for which density profiles propagate as solitary waves with a characteristic velocity along the bundle. These behaviors emerge from an interplay of local contractions in the… (More)

- S Camalet, J Schriefl, P Degiovanni, F Delduc
- 2007

PACS. 32.80.-t – Photon interactions with atoms. PACS. 71.10.Pm – Fermions in reduced dimensions. Abstract. – We consider a system of two qubits at the ends of a finite length 1D cavity. This problem is mapped onto the double-Kondo model which is also shown to describe the low energy physics of a finite length quantum wire with resonant levels at its ends.… (More)

- S. Camalet
- 2007

We consider a quantum system weakly coupled to a large heat bath of harmonic oscillators. It is well known that such a boson bath initially at thermal equilibrium thermalises the system. We show that assuming a priori an equilibrium state is not necessary to obtain the thermalisation of the system. We determine the complete Schrödinger time evolution of the… (More)

- I V Abarenkov, I I Tupitsyn, V G Kuznetsov, M C Payne, A Altland, B D Simons " Field +19 others
- 2004

structure of crystalline phosphorus pentoxide and the effect of an Ag impurity " Phys. structure of crystalline phosphorus pentoxide and the effect of Ag impurity " Proc. Auditory sensitivity provided by self-tuned critical oscillations of hair cells " Proc. Sorting by diffusion: an asymmetric obstacle course for continuous molecular separation " Proc. A… (More)

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