2020/08/31 by K. Ono, S. N. Shevchenko, T. Mori +2 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.125.166802
published as Phys. Rev. Lett. 125, 166802 (2020) · 6 pages + 17 pages of Supplemental Material
arxiv created 2020/09/14 · arxiv updated 2020/10/21
A quantum two-level system with periodically modulated energy splitting could provide a minimal universal quantum heat machine. We present the experimental realization and the theoretical description of such a two-level system as an impurity electron spin in a silicon tunnel field-effect transistor. In the incoherent regime, the system can behave analogously to either an Otto heat engine or a refrigerator. The coherent regime could be described as a superposition of those two regimes, producing specific interference fringes in the observed source-drain current.