Arbitrary segments of absolute negative mobility

Abstract

In previous research work, investigators have reported only one or two segments of absolute negative mobility (ANM) in a periodic potential. In fact, many segments of ANM also occur in the system considered here. We investigate transport of an inertial particle in a gating ratchet periodic potential subjected to a constant bias force. Our numerical results show that its mean velocity can decrease with the bias force increasing, i.e. ANM phenomenon. Furthermore, the ANM can take place arbitrary segments, even up to more than thirty. Intrinsic physical mechanism and conditions for arbitrary segments of ANM to occur are discussed in detail.

Two-dimensional chaotic thermostat and behavior of a thermalized charge in a weak magnetic field

“…As is shown in Fig. 13, this negative region is associated with 'absolute negative mobility' (ANM) [22][23][24][25][26][27].…”

“…The magnetic field dependence of the scaled diffusion coefficient associated with the 2D chaotic model is represented in Fig. 11 This counter-intuitive behavior has received considerable attention in a variety of systems [22][23][24][25][26][27] in which often the symmetry breaking process results from scattering by a barrier or ratchet. The surprise here is that ANM arises in the magnetized chaotic thermostat intrinsically from the competition between the fluctuations and the external push, without boundary effects.…”

“…The model is used to explore the diffusive motion of a thermalized charge in a weak magnetic field and the associated Hall and Pedersen mobilities. Over a range of magnetic field strengths the charge exhibits absolute negative mobility (ANM) [22][23][24][25][26][27] while displaying a Maxwellian velocity distribution.…”

Calculation of radiative heat flux on irregular boundaries in participating media*

“…Monte Carlo method is now widely used in many areas. [33][34][35][36][37][38] Conventional forward Monte Carlo (FMC) and DOM have difficulties in calculating the radiative heat flux at these points. In the FMC method, energy bundles are emitted from the entire computational domain, and because the statistical nature of the Monte Carlo method, substantial energy bundles are needed to ensure that enough bundles can reach the specific points at the irregular boundary to eliminate statistical errors.…”

Coexistence of absolute negative mobility and anomalous diffusion

“…The phenomenon of absolute negative mobility (ANM) [6][7][8][9][10][11][12][13][14][15] may be regarded as a form of anomalous directed transport. In this case, transported particles move in a direction opposite to the net acting force around zero bias.…”