Metastable states are states that are stable (on a certain time scale) but do not represent the global energy minimum of the system. In 2014, the first controlled
transition to an electronic metastable state was achieved in 1\textit{T}-TaS$_2$, which opened the door to the study of new physics and presented a path to practical applications.
In this master’s thesis, I will present the control of metastable electronic states in the materials 1\textit{T}-TaS$_2$ and EuTe$_4$.
In the first part of the thesis, I will examine the effect of an aluminum 7075 substrate on the temperature stability of the metastable state in 1\textit{T}-TaS$_2$ and demonstrate stability at a higher temperature than that achieved with standard substrates.
In the second part of the thesis, I will present measurements on the new material EuTe$_4$, where I will demonstrate a controlled transition to a long-lived metastable electronic state at room temperature!
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