Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"millikelvin"”.
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Millikelvin temperature control system for the ExoplanetSat Imager
… system at the target temperature within the 30 millikelvin range, with the best performance of 5 millikelvin control. The temperature control system can be used at various phases of ExoplanetSat development, including laboratory simulation of the temperature control of the ExoplanetSat imager …
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EXCALIBRATE Bayesian calibration for data-intensive astrophysical experimentation
… needed to confidently distinguish these millikelvin-level signatures from galactic foregrounds and instrument systematics. In this work we detail the development of a calibration methodology that expands upon the Dicke switching procedure introduced for microwave-frequency devices and …
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Quantum turbulence generated by moving grids
… by moving grids within superfluid 4He, both at millikelvin temperatures, with an oscillating grid, and at temperatures above 1.4 K with a linearly moving grid. Floppy devices were used at millikelvin temperatures to produce quantum turbulence. We investigated the frequency dependence of the …
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Vortices and Quasiparticles in Superconducting Microwave Resonators
… microwave resonant circuits and qubits at millikelvin temperatures. Quasiparticles result in excess loss, reducing resonator quality factors and qubit lifetimes. Vortices trapped near regions of large microwave currents also contribute excess loss. However, vortices located in current-free …
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Experimental investigations of the pretransition behavior near the nematic-smectic A phase transition
… distortion. Both measurements are performed with millikelvin temperature resolution and yield critical exponents for the elastic constants and the twist viscosity coefficient. These results are inconsistent with the three proposed theories of the critical behavior at least in the simple form in …
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Nanoelectronic and nanomechanical devices for low temperature applications
… extend physical experimental research into the millikelvin-nanoscale domain. The challenge of thermometry becomes an increasingly complex problem as the temperature of a physical system lowers. We describe the development and methods for a specially modified Coulomb blockade thermometer to …
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Microstrip Superconducting Quantum Interference Devices for Quantum Information Science
… in macroscopic superconducting circuits at millikelvin temperatures. We have developed a microstrip superconducting quantum interference device (SQUID) amplifier (MSA) to provide the first stage of amplification for these systems. Employing sub-micron Josephson tunnel junctions for enhanced …
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MINERVA-RED: A TELESCOPE DEDICATED TO THE DISCOVERY OF NEARBY PLANETS
… environmental control system that provides milliKelvin temperature stability for the instrument. I will discuss the current limitations of the MINERVA-Red system and how in the future, single-mode fiber-fed spectrographs may play a key role in the ongoing quest to detect Earth-like planets.
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Digital Readout and Control of a Superconducting Qubit
… high-bandwidth lines from room temperature to millikelvin temperatures, and bulky non-reciprocal elements such as cryogenic microwave isolators. Reliance on these elements makes it impractical to scale existing devices up a single order of magnitude, let alone the 5-6 orders of magnitude needed …
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New features in the phase diagrams of the cuprate high-Tc superconductors mapped using strong magnetic fields
… using low applied measurement currents and milliKelvin temperatures, we reveal an unconventional quantum vortex matter ground state hosting quantum oscillations. This vortex matter ground state is highly resilient to applied magnetic field, but fragile to applied temperature and current. It …
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Quantum transport in magnetic topological insulators
… the sample temperature due to Joule heating at millikelvin temperatures. The inferred electron temperature is found to be proportional to the source-drain current in our measurements. Because so far the QAH effect can only be observed at millikelvin temperatures and Joule heating should always …
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Superglass Dynamics Of Solid Helium
… material, we constructed a vibrationallyisolated millikelvin cryostat with automated data acquisition and temperature control, and used a high-dynamic range DC-SQUID-based displacement sensor to detect its rotational susceptibility. We observed ultra-slow evolution towards equilibrium of the …
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An Investigation of the Magnetic and Electrical Properties of YNi3
… and at sufficiently low temperatures in the low millikelvin temperature range.
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Silicon Nanoelectronics for Quantum Metrology Standard and Cryogenic SBMOSFET
… the room-temperature probing test as well as millikelvin temperature measurement, we found the revision significantly improved the yield and the quality of the sensor. We also successfully fabricated the pump-sensor integrated devices. In a preliminary study, we observed a large amplitude …
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High Resolution Optical Tweezers for Biological Studies
… implementing a temperature feedback system with millikelvin precision—a convenient solution for biological experiments since it minimizes drift in addition to enabling the control and stabilization of the experiment’s temperature. Furthermore, we found that expanding the laser beam to a size …
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Transport and thermodynamic studies of the superconductors A3T4Sn13 and YFe2Ge2
… thermal conductivity of YFe$_2$Ge$_2$ down to millikelvin temperatures and up to 2.5 T in field. Our results suggest that YFe$_2$Ge$_2$ is a nodal superconductor. This result could assist in the explanation of the unconventional superconductivity in iron-based superconductors.
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Investigating electron transport in chemical vapor deposition graphene nanostructures
… explored via magnetotransport measurements at millikelvin temperature. Single-electron behaviors such as Aharonov-Bohm effect and Coulomb blockade effect are observed, whereas signatures of the effective antidots proved elusive, probably due to the disorder-broadening of the Landau levels. …
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Quantum Critical Ferroelectricity and Emergent Phenomena in KTaO3 and SrTiO3
… the conversion of a 1K pumped He-4 system into a millikelvin adiabatic demagnetization refrigerator with an electrically-controlled gas-gap heat switch.
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Fermi Surfaces and Where to Find Them: Quantum Oscillations in Kondo Insulators and High-Temperature Superconductors
… performed in DC magnetic fields, down to millikelvin temperatures, that reveal the high-field superconducting state to be characterised by non-ohmic signatures associated with a quantum vortex matter state. In contrast to previous proposals, the quantum oscillations are found to occur well …
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Photon-Number Resolving by Superconductive Devices
… takes advantage of the sharp transition (few millikelvin) from the superconducting to the normal phase; for this reason it is sometimes called Superconductive Phase Thermometer (SPT). In the ultraviolet (UV) to infrared (IR) wavelength range, the photons are absorbed directly by the …