Non-Thermal Resistive Switching in Mott Insulator Nanowires

J. DEL VALLE; I. K. SCHULLER; Y. KALCHEIM; P. SALEV; A. CAMJAYI; M. J. ROZENBERG

NATURE COMMUNICATIONS

Springer Nature

Año: 2020 vol. 11 p. 2985 - 2985

2041-1723

Resistive switching can be achieved in a Mott insulator by applyingcurrent/voltage, which triggers an insulator-metal transition (IMT). Thisphenomenon is key for understanding IMT physics and developing novelmemory elements and brain-inspired technology. Despite this, the roles ofelectric field and Joule heating in the switching process remain controversial.We resolve this issue by studying nanowires of two archetypical Mottinsulators - VO2 and V2O3. Our findings show a crossover between twoqualitatively different regimes. In one, the IMT is driven by Joule heating to the transition temperature, while in the other, field-assisted carrier generation gives rise to a doping driven IMT which is purely non-thermal. By identifying the key material properties governing these phenomena, we propose a universal mechanism for resistive switching in Mott insulators. This understanding enabled us to control the switching mechanism using focused ion-beam irradiation, thereby facilitating an electrically driven non-thermal IMT. The energy consumption associated with the non-thermal IMT is extremely low, rivaling that of state of the art electronics and biological neurons. These findings pave the way towards highly energy-efficient applications of Mott insulators.