Lee, Young Woong Kim, Seon Jeong Kim, Jaewook Kim, Sangheon Park, Jongkil Jeong, Yeonjoo Hwang, Gyu Weon Park, Seongsik Park, Bae Ho Lee, Suyoun 2024-06-07T02:30:15Z 2024-06-07T02:30:15Z 2024-06-07 2024-05 https://pubs.kist.re.kr/handle/201004/150021 As there is an increasing need for an efficient solver of combinatorial optimization problems, much interest is paid to the Ising machine, which is a novel physics-driven computing system composed of coupled oscillators mimicking the dynamics of the system of coupled electronic spins. In this work, we propose an energy-efficient nano-oscillator, called OTSNO, which is composed of an Ovonic Threshold Switch (OTS) and an electrical resistor. We demonstrate that the OTSNO shows the synchronization behavior, an essential property for the realization of an Ising machine. Furthermore, we have discovered that the capacitive coupling is advantageous over the resistive coupling for the hardware implementation of an Ising solver by providing a larger margin of the variations of components. Finally, we implement an Ising machine composed of capacitively-coupled OTSNOs to demonstrate that the solution to a 14-node MaxCut problem can be obtained in 40 mu s while consuming no more than 2.3 mu J of energy. Compared to a previous hardware implementation of the phase-transition nano-oscillator (PTNO)-based Ising machine, the OTSNO-based Ising machine in this work shows the performance of the increased speed by more than one order while consuming less energy by about an order. English Springer | Korea Nano Technology Research Society Demonstration of an energy-efficient Ising solver composed of Ovonic threshold switch (OTS)-based nano-oscillators (OTSNOs) Article 10.1186/s40580-024-00429-2 1 Nano Convergence, v.11, no.1 Nano Convergence 11 1 Y scie scopus kci 001230189200001 2-s2.0-85194415293 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article MACHINES LOCKING MODEL Ising solver Ovonic threshold switch (OTS) Oscillator-based computing