146 citations · 417 across the 14 of their papers we have counts for
14 papers
Semiconductor nanofilms as thermal phonon polarizers: competing effects of scattering selection rules and boundary mode conversion
Vasumathy Ravishankar, Navaneetha K. Ravichandran
Phonon scattering selection rules are known to control heat flow through bulk solids. Here we show that these selection rules also modulate heat flow through nanoscale semiconducto…
Bridging the continuum and the kinetic-Boltzmann theories of heat flow through generalized Knudsen numbers
Nikhil Malviya, Navaneetha K. Ravichandran
Heat conduction in semiconductor crystals is fundamentally governed by the linearized Peierls-Boltzmann equation (LPBE) for phonon transport, that arises out of a kinetic theory fo…
Examining the microscopic origin of a computationally inexpensive thermal-conductivity-based indicator for phonon hydrodynamics
Nikhil Malviya, Navaneetha K. Ravichandran
Hydrodynamic heat flow, where out-of-equilibrium phonons collectively drift in response to a temperature gradient, has attracted renewed interest following its experimental observa…
Elasticity reshapes heat flow in graphene
Navaneetha K. Ravichandran
Classical thermal transport theories that preserve rotational symmetry, predict strong anharmonic scattering of out-of-plane lattice vibrational modes called flexural phonons in fl…
Low bending rigidity and large Young's modulus drive strong flexural phonon renormalization in two-dimensional monolayers
Navaneetha K Ravichandran
Many intriguing phenomena such as the wave-like hydrodynamic heat flow, the logarithmic divergence of electrical resistivity at low temperatures and microscale kirigami are driven…
Efficient calculation of phonon dynamics through a low-rank solution of the Boltzmann equation
Nikhil Malviya, Navaneetha K. Ravichandran
Exotic nondiffusive heat transfer regimes such as the second sound, where heat propagates as a damped wave at speeds comparable to those of mechanical disturbances, often occur at…
Dramatic Failure of the Callaway Description of Heat Flow in Boron Arsenide and Boron Antimonide Driven by Phonon Scattering Selection Rules
Nikhil Malviya, Navaneetha K. Ravichandran
Callaway's simplified heat flow model is often used to confirm experimental realizations of unconventional, hydrodynamic and Poiseuille phonon transport in ultrahigh thermal conduc…
How do defects limit the ultrahigh thermal conductivity of BAs? A first principles study
Mauro Fava, Nakib Haider Protik, Chunhua Li +6
The promise enabled by BAs high thermal conductivity in power electronics cannot be assessed without taking into account the reduction incurred when doping the material. Using firs…
Exposing the hidden influence of selection rules on phonon-phonon scattering by pressure and temperature tuning
Navaneetha K. Ravichandran, David Broido
Using ab initio calculations, we show that the hidden influence of selection rules on three-phonon scattering can be exposed through anomalous signatures in the pressure () and…
Phonon-Phonon Interactions in Strongly Bonded Solids: Selection Rules and Higher-Order Processes
Navaneetha K. Ravichandran, David Broido
We show that the commonly used lowest-order theory of phonon-phonon interactions frequently fails to accurately describe the anharmonic phonon decay rates and thermal conductivity…
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…
The Role of Thermalizing and Non-thermalizing Walls in Phonon Heat Conduction along Thin Films
Navaneetha K. Ravichandran, Austin J. Minnich
Phonon boundary scattering is typically treated using the Fuchs-Sondheimer theory, which assumes that phonons are thermalized to the local temperature at the boundary. However, whe…
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…
Coherent and Incoherent Thermal Transport in Nanomeshes
Navaneetha K. Ravichandran, Austin J. Minnich
Coherent thermal transport in nanopatterned structures is a topic of considerable interest, but whether it occurs in certain structures remains unclear due to poor understanding of…