nanoelectronics - Institut d'Études Scientifiques de Cargèse (IESC)

More documents

Recommendations

Info

$flow abd transport in porous and fractured media:development ...$

Monday [1] Clivia M Sotomayor Torres and Jouni Ahopelto, Position Paper on Nanophotonics and Nanophononics, E-Nano Newsletter (Issue 24) Publishing Date: 2011-12-31. [2] J. Tang et al. Holey Silicon as an Efficient Thermoelectric Material, Nano Letters 10, 4279 (2010) [3] J-S. Heron, C. Bera, T. Fournier, N. Mingo, and O. Bourgeois, Blocking phonons via nanoscale geometrical design, Phys. Rev. B 82, 155458 (2010). [4] Christophe Blanc, Ali Rajabpour, Sebastian Volz, Thierry Fournier, and Olivier Bourgeois Phonon Glass Behaviour in Corrugated Silicon Nanowires Due to Phonon Backscattering. (2012) [5] A. Sikora, H. Ftouni, J. Richard, C. Hébert, D. Eon, F. Omnès, and O. Bourgeois, Highly sensitive thermal conductivity measurements of suspended membranes (SiN and diamond) using a 3ω-Völklein method. Rev. Sci. Instrum. 83, 054902 (2012). __________________________________________________________________________ Scattering approach to heat transport. Application to a single-electron emitter for chiral wave-guides Michael Moskalets Department of Metal and Semiconductor Physics, National Technical University “Kharkiv Polytechnical Institute” 61002 Kharkiv, Ukraine We present a scattering matrix approach to heat transport in dynamical mesoscopic structures for non-interacting electrons [1-3]. We show quite generally existence of two effects, heat generation and heat pumping. In particular we analyze energetics [4] of a single-particle source emitting on-demand electrons and holes [5]. It turns out that the energy of emitted particles is not fixed unlike their charge. Therefore, even a regular particle flow carries a fluctuating heat. These heat fluctuations can be measured as temperature fluctuations of an attached thermometer, which in turn can be measured as the fourth cumulant of a potential if a thermometer serves simultaneously as a voltage probe. Notice the fluctuations of a heat of a regular particle flow are a feature of an essentially dynamical source and it is absent for a DC source. We analyze a heat production [4] of two subsequent single-particle sources working as a tunable two-particle source [6]. We show that unlike a charge current the heat current can be non-additive. In particular, in the adiabatic regime the heat production can be suppressed if the second source is tuned to emit a hole at the time when the first source emits an electron or vice versa. We show also that the heat generated becomes enhanced if two electrons or two holes are emitted simultaneously. [1] M. Moskalets, M. Büttiker, Floquet scattering theory of quantum pumps, Phys. Rev. B 66, 205320 (2002) [2] L. Arrachea, M. Moskalets, Energy transport and heat production in quantum engines, in Handbook of Nanophysics: Nanomedicine and Nanorobotics, ed. by Klaus D. Sattler (CRC Press, Taylor & Francis Group), 38-1 (2010) [3] M. Moskalets, Scattering matrix approach to non-stationary quantum transport, (Imperial College Press, London), 280 p. (2011) [4] M. Moskalets, M. Büttiker, Heat production and current noise for single- and double-cavity quantum capacitors, Phys. Rev. B 80 081302 (2009) [5] G. Fève, A. Mahé, J.-M. Berroir, T. Kontos, B. Plaçais, D. C. Glattli, A. Cavanna, B. Etienne, Y. Jin, An On-Demand Coherent Single-Electron Source, Science 316, 1169 (2007) [6] J. Splettstoesser, S. Ol’khovskaya, M. Moskalets, M. Büttiker, Electron counting with a two-particle emitter, Phys. Rev. B 78, 205110 (2008)
Tuesday Tuesday, October 23 Random-matrix theory of thermoelectricity Carlo Beenakker Instituut-Lorentz, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands Since Landauer, Büttiker, and Imry’s work in the 1980’s we know that the study of electrical conductance in mesocopic systems is related to the study of the statistical properties of scattering matrices. Random-matrix theory was developed as a powerful tool to make universal predictions, independent of microscopic details of the system. Thermoelectric transport properties typically involve energy derivatives of the conductance, and one might wonder whether random-matrix theory can play an instructive role as well. The relevant matrix is the socalled time-delay matrix, which contains dynamical information on the electron scattering. We review some older work on the random-matrix theory of thermoelectricity, and also some recent work on thermal conduction in topological superconductors. General background material: ArXiv:0904.1432 __________________________________________________________________________ Thermoelectric Properties of Semiconductor Nanostructures Laurens W. Molenkamp Physikalisches Institut (EP3) der Universität Würzburg, Am Hubland, 97074 Würzburg Thermoelectric experiments on nanostructures are often complicated by the need to apply a temperature difference of a few K across a device a few 100 nm in size. In semiconductors, such large gradients lead to very strong phonon drag effects, that overwhelm the electronic thermoelectric effects a transport physicist usually is interested in. Over the years, we have developed a current heating technique that utilizes the relatively small electron-acoustic phonon coupling in semiconductors to create a thermal gradient in the electronic system only. This has allowed us to study in detail the thermoelectric properties of quantum point contacts and quantum dots. More recently, we have started to apply the technique to spintronic nanostructures. In this talk, I will present some of our recent results in this direction, with examples such as the thermoelectric properties of a dot in the Kondo regime, thermal rectification and the diffusion thermopower of (Ga,Mn)As.
Page 1 and 2: 2012 22 Octobre 27 Octobre WORKSHOP
Page 3 and 4: Afternoon Morning Timetable Monday
Page 5 and 6: 15h50 - 16h20 Coffee Break 16h20 -
Page 7 and 8: Monday Abstracts Monday, October 22
Page 9: Monday Single-Electron Tunneling an
Page 13 and 14: Tuesday the energy level spacings a
Page 15 and 16: Tuesday Electron refrigeration by n
Page 17 and 18: Wednesday [4] K. Saito, G. Benenti,
Page 19 and 20: Thursday [3] B. A. Bernevig, T. L.
Page 21 and 22: Thursday Electronic standing waves
Page 23 and 24: Friday Nanoscale inhomogeneities in
Page 25 and 26: Friday Electron focusing in graphem
Page 27 and 28: Friday molecules. We explain the or
Page 29 and 30: Posters Posters Ab-initio study of
Page 31 and 32: Posters Nonclassical photon-pair pr

nanoelectronics - Institut d'Études Scientifiques de Cargèse (IESC)

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?