696 citations · 3.1k across the 67 of their papers we have counts for
23 papers · 1 filter
On the channel noise in InP HEMTs from 4 K to 300 K
Junjie Li, Justin H. Chen, Austin J. Minnich +1
The InP high-electron-mobility transistor (HEMT) is indispensable for low-noise amplifiers (LNAs) in radio astronomy and quantum computing. The composition of the $\mathrm{In_{x}Ga…
Isotropic atomic layer etching of MgO-doped lithium niobate using sequential exposures of H and SF plasmas
Ivy I. Chen, Jennifer Solgaard, Ryoto Sekine +7
Lithium niobate (LiNbO, LN) is a ferroelectric crystal of interest for integrated photonics owing to its large second-order optical nonlinearity and the ability to impart perio…
Isotropic plasma-thermal atomic layer etching of superconducting TiN films using sequential exposures of molecular oxygen and SFH plasma
Azmain A. Hossain, Haozhe Wang, David S. Catherall +4
Microwave loss in superconducting titanium nitride (TiN) films is attributed to two-level systems in various interfaces arising in part from oxidation and microfabrication-induced…
Experimental Investigation of Drain Noise in High Electron Mobility Transistors: Thermal and Hot Electron Noise
Bekari Gabritchidze, Kieran A. Cleary, Anthony C. Readhead +1
We report the on-wafer characterization of -parameters and microwave noise temperature () of discrete metamorphic InGaAs high electron mobility transistors (mHEMTs) at 4…
Isotropic plasma-thermal atomic layer etching of aluminum nitride using SF plasma and Al(CH)
Haozhe Wang, Azmain Hossain, David Catherall +1
We report the isotropic plasma atomic layer etching (ALE) of aluminum nitride using sequential exposures of SF plasma and trimethylaluminum (Al(CH), TMA). ALE was obser…
Theory of drain noise in high electron mobility transistors based on real-space transfer
Iretomiwa Esho, Alexander Y. Choi, Austin J. Minnich
High electron mobility transistors are widely used as microwave amplifiers owing to their low microwave noise figure. Electronic noise in these devices is typically modeled by nois…
Quasiballistic electron transport in cryogenic SiGe HBTs studied using an exact, semi-analytic solution to the Boltzmann equation
Nachiket R. Naik, Austin J. Minnich
Silicon-germanium heterojunction bipolar transistors (HBTs) are of interest as low-noise microwave amplifiers due to their competitive noise performance and low cost relative to II…
Characterization of self-heating in cryogenic high electron mobility transistors using Schottky thermometry
Alexander Y. Choi, Iretomiwa Esho, Bekari Gabritchidze +2
Cryogenic low noise amplifiers based on high electron mobility transistors (HEMTs) are widely used in applications such as radio astronomy, deep space communications, and quantum c…
Heat dissipation in the quasiballistic regime studied using Boltzmann equation in the spatial frequency domain
Chengyun Hua, Austin J. Minnich
Quasiballistic heat conduction, in which some phonons propagate ballistically over a thermal gradient, has recently become of intense interest. Most works report that the thermal r…
Experimental metrology to obtain thermal phonon transmission coefficients at solid interfaces
Chengyun Hua, Xiangwen Chen, Navaneetha K. Ravichandran +1
Interfaces play an essential role in phonon-mediated heat conduction in solids, impacting applications ranging from thermoelectric waste heat recovery to heat dissipation in electr…
Sub-amorphous thermal conductivity in amorphous heterogeneous nanocomposites
Jaeyun Moon, Austin J. Minnich
Pure amorphous solids are traditionally considered to set the lower bound of thermal conductivity due to their disordered atomic structure that impedes vibrational energy transport…
Fresnel transmission coefficients for thermal phonons at solid interfaces
Chengyun Hua, Xiangwen Chen, Navaneetha K. Ravichandran +1
Interfaces play an essential role in phonon-mediated heat conduction in solids, impacting applications ranging from thermoelectric waste heat recovery to heat dissipation in electr…
Crystalline Polymers with Exceptionally Low Thermal Conductivity Studied using Molecular Dynamics
Andrew B. Robbins, Austin J. Minnich
Semi-crystalline polymers have been shown to have greatly increased thermal conductivity compared to amorphous bulk polymers due to effective heat conduction along the covalent bon…
Temperature Dependent Mean Free Path Spectra of Thermal Phonons Along the c-axis of Graphite
Hang Zhang, Xiangwen Chen, Young-Dahl Jho +1
Heat conduction in graphite has been studied for decades because of its exceptionally large thermal anisotropy. While the bulk thermal conductivities along the in-plane and cross-p…
Thermal phonon boundary scattering in anisotropic thin films
Austin J. Minnich
Boundary scattering of thermal phonons in thin solid films is typically analyzed using Fuchs-Sondheimer theory, which provides a simple equation to calculate the reduction of therm…
Multidimensional quasiballistic thermal transport in transient grating spectroscopy
Austin J. Minnich
Transient grating spectroscopy has emerged as a useful technique to study thermal phonon transport because of its ability to perform thermal measurements over length scales compara…
Active Thermal Extraction of Near-field Thermal Radiation
Ding Ding, Austin J. Minnich
Radiative heat transport between materials supporting surface-phonon polaritons is greatly enhanced when the materials are placed at sub-wavelength separation as a result of the co…
Cross-plane heat conduction in thin solid films
Chengyun Hua, Austin J. Minnich
Cross-plane heat transport in thin films with thickness comparable to the phonon mean free paths is of both fundamental and practical interest. However, physical insight is difficu…
Length Dependent Thermal Conductivity Measurements Yield Phonon Mean Free Path Spectra in Nanostructures
Hang Zhang, Chengyun Hua, Ding Ding +1
Thermal conductivity measurements over variable lengths on nanostructures such as nanowires provide important information about the mean free paths (MFPs) of the phonons responsibl…
Phonon heat conduction in layered anisotropic crystals
A. J. Minnich
The thermal properties of anisotropic crystals are of both fundamental and practical interest, but transport phenomena in anisotropic materials such as graphite remain poorly under…
Towards a microscopic understanding of phonon heat conduction
Austin J. Minnich
Heat conduction by phonons is a ubiquitous process that incorporates a wide range of physics and plays an essential role in applications ranging from space power generation to LED…
Importance of frequency-dependent grain boundary scattering in nanocrystalline silicon and silicon-germanium thermoelectrics
Chengyun Hua, Austin J. Minnich
Nanocrystalline silicon and silicon-germanium alloys are promising thermoelectric materials that have achieved substantially improved figure of merits compared to their bulk counte…
Quasiballistic Heat Conduction in Transient Grating Spectroscopy
Chengyun Hua, Austin J. Minnich
Transient grating (TG) spectroscopy is an important experimental technique to measure mean free path (MFP) spectra using observations of quasiballistic heat conduction. To obtain M…