A simple test for ideal memristors

TL;DR

The paper proposes a simple, definitive experimental test to verify if a resistor with memory is an ideal memristor, addressing ambiguities caused by similar hysteresis behaviors in other memory-resistive devices.

Contribution

It introduces a straightforward duality-based test that unambiguously distinguishes ideal memristors from other resistive memory devices.

Findings

The test confirms whether a resistor with memory is truly an ideal memristor.

It resolves controversies about the physical existence of ideal memristors.

The method is practical for experimental validation across various initial states and voltages.

Abstract

An ideal memristor is defined as a resistor with memory that, when subject to a time-dependent current, $I(t)$, its resistance $R_M(q)$ depends {\it only} on the charge $q$ that has flowed through it, so that its voltage response is $V(t)=R_M(q)I(t)$. It has been argued that a clear fingerprint of these ideal memristors is a pinched hysteresis loop in their I-V curves. However, a pinched I-V hysteresis loop is not a definitive test of whether a resistor with memory is truly an ideal memristor because such a property is shared also by other resistors whose memory depends on additional internal state variables, other than the charge. Here, we introduce a very simple and {\it unambiguous} test that can be utilized to check experimentally if a resistor with memory is indeed an ideal memristor. Our test is based on the duality property of a capacitor-memristor circuit whereby, for any initial resistance states of the memristor and any form of the applied voltage, the final state of an ideal memristor must be identical to its initial state, if the capacitor charge finally returns to its initial value. In actual experiments, a sufficiently wide range of voltage amplitudes and initial states are enough to perform the test. The proposed test can help resolve some long-standing controversies still existing in the literature about whether an ideal memristor does actually exist or it is a purely mathematical concept.