AIP Advances 8, 055027 (2018); https://doi.org/10.1063/1.5017070 Near-field refrigeration and tunable heat exchange through four-wave mixing AIP Advances 8, 055029 (2018); https://doi.org/10.1063/1.5018734 Ga 2 O 3 Schottky rectifiers with 1 ampere forward current, 650 V reverse breakdown and 26.5 MW.cm -2 figure-of-merit AIP Advances 8, 055026 (2018); https://doi.