This work has been supported by the European Research Council (ERC) under the European Union’s
Horizon 2020 research and innovation programme (Grant Agreement # 694248).
Citation:
G. E. Volovik, “Negative temperature for negative lapse function”, Pis'ma v Zh. Èksper. Teoret. Fiz., 109:1 (2019), 10–11; JETP Letters, 109:1 (2019), 8–11