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We report experimental observation of an unexpectedly large thermopower in mesoscopic two-dimensional (2D) electron systems on GaAs/AlGaAs heterostructures at sub-Kelvin temperatures and zero magnetic field. Unlike conventional non-magnetic…

Mesoscale and Nanoscale Physics · Physics 2015-05-13 Srijit Goswami , Christoph Siegert , Matthias Baenninger , Arindam Ghosh , Michael Pepper , Ian Farrer , David A. Ritchie

Self-heating in surrounding gate transistors can degrade its on-current performance and reduce lifetime. If a transistor heats/cools with time-constants less than the inverse of the operating frequency, a predictable, frequency-independent…

Instrumentation and Detectors · Physics 2016-09-02 SangHoon Shin , Muhammad Masuduzzaman , Muhammad Ashraful Alam

We report temporal measurements of the electronic temperature and the electron-phonon thermal relaxation rate in a micron-scale metal island, with a heat capacity of order 1 fJ/K . We employed a superconductor-insulator-normal metal tunnel…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 D. R. Schmidt , C. S. Yung , A. N. Cleland

We explore the possibility to perform an in-situ transmission electron microscopy (TEM) thermoelectric characterization of materials. A differential heating element on a custom in-situ TEM microchip allows to generate a temperature gradient…

Materials Science · Physics 2025-01-14 Simon Hettler , Mohammad Furqan , Andres Sotelo , Raul Arenal

052<p type="texpara" tag="Body Text" et="abstract" >The superconducting proximity effect is measured in sandwiches of thin Pb films and the alkali metals Cs, Rb, K and Na. The $T_{c}$-dependence provides information about the interface…

Superconductivity · Physics 2009-11-10 D. Garrett , M. Zhang , G. Bergmann

We present specific heat measurements which show an unexpected phase transition from d-wave symmetry to s-wave symmetry as the temperature is reduced in electron-doped Pr$_{2-x}$Ce$_{x}$CuO$_{4-\delta}$ (PCCO), in both optimal and…

Superconductivity · Physics 2007-05-23 Hamza Balci , R. L. Greene

Proximity effects at superconducting interfaces, between different superconductors (S-S') or between superconductors and normal metals (S-N), are fundamental to the performance of superconducting electronics, yet only few experiments have…

The superconducting proximity effect is investigated for SN double layers in a regime where the resulting transition temperature T_{c} does not depend on the mean free paths of the films and, within limits, not on the transparency of the…

Mesoscale and Nanoscale Physics · Physics 2009-11-11 M. Zhang , G. Tateishi , G. Bergmann

The Casimir effect between metal surfaces has now been well-verified at the few-percent level experimentally. However, the temperature dependence has never been observed in the laboratory, since all experiments are conducted at room…

High Energy Physics - Theory · Physics 2014-01-28 K. A. Milton , Iver Brevik , Simen A. Ellingsen

The density functional theory for superconductors developed in the preceding article [cond-mat/0408685] is applied to the calculation of superconducting properties of several elemental metals. In particular, we present results for the…

We propose a method of measuring the electron temperature $T_e$ in mesoscopic conductors and demonstrate experimentally its applicability to micron-size graphene devices in the linear-response regime ($T_e\approx T$, the bath temperature).…

Mesoscale and Nanoscale Physics · Physics 2009-04-29 K. Kechedzhi , D. W. Horsell , F. V. Tikhonenko , A. K. Savchenko , R. V. Gorbachev , I. V. Lerner , V. I. Fal'ko

Nanomechanical resonators have emerged as sensors with exceptional sensitivities. These sensing capabilities open new possibilities in the studies of the thermodynamic properties in condensed matter. Here, we use mechanical sensing as a…

Recently experiments on high critical temperature superconductors has shown that the doping levels and the superconducting gap are usually not uniform properties but strongly dependent on their positions inside a given sample. Local…

Superconductivity · Physics 2009-11-10 J. L. González , E. V. L. de Mello

An experimental setup was developed for the measurement of the thermoelectric power (TEP, Seebeck coefficient) in the temperature range from 2 to 350 K and magnetic fields up to 140 kOe. The system was built to fit in a commercial cryostat…

Instrumentation and Detectors · Physics 2015-05-18 Eundeok Mun , Sergey L. Bud'ko , Milton S. Torikachvili , Paul C. Canfield

We predict that superconducting particles will show an apparent increase in thickness at low temperatures when measured by electron holography. This will result not from a real thickness increase, rather from an increase in the mean inner…

Superconductivity · Physics 2013-06-18 J. E. Hirsch

The thermopower and conductance of atomic-size metallic contacts have been simultaneously measured using a mechanically controllable break junction. For contacts approaching atomic dimensions, abrupt steps in the thermopower are observed…

Mesoscale and Nanoscale Physics · Physics 2009-10-31 B. Ludoph , J. M. van Ruitenbeek

We study ensembles of fermionic cold-atom quantum wires with tunable transverse mode population and single-wire resolution. From in situ density profiles, we determine the temperature of the atomic wires in the weakly interacting limit and…

We present a measurement and analysis scheme for determining traceable thermodynamic temperature at cryogenic temperatures using Coulomb blockade thermometry. The uncertainty of the electrical measurement is improved by utilizing two…

The charge localization of single electrons on mesoscopic metallic islands leads to a suppression of the electrical current, known as the Coulomb blockade. When this correction is small, it enables primary electron thermometry, as it was…

Mesoscale and Nanoscale Physics · Physics 2021-07-23 Nikolai Yurttagül , Matthew Sarsby , Attila Geresdi

A method to measure thermophysical characteristics (TPC) of conductive materials is described. The method is based upon controlled bulk (e.g., Ohmic) heating and measurement of the averaged over the volume of a sample temperature and the…

Materials Science · Physics 2012-05-16 Yuri Kornyushin