Nematic order driven by superconducting correlations

TL;DR

This paper investigates how superconducting correlations can induce nematic order in a 2D system, revealing a phase diagram where superconductivity promotes long-range nematicity, with implications for quantum materials like KTaO3 interfaces and doped topological insulators.

Contribution

The study introduces a model coupling nematogens to Josephson junction networks and demonstrates how superconducting correlations can drive nematic order, supported by Monte Carlo simulations.

Findings

Superconducting correlations promote nematic long-range order.

Phase diagram shows interplay between nematicity and superconductivity.

Transport properties modeled as an effective resistor network.

Abstract

The interplay of nematicity and superconductivity has been observed in a wide variety of quantum materials. To explore this interplay, we consider a two-dimensional (2D) array of nematogens, local droplets with $Z_3$ nematicity, coupled to a network of Josephson junction wires. Using finite temperature classical Monte Carlo simulations, we elucidate the phase diagram of this model and show that the development of superconducting correlations and the directional delocalization of Cooper pairs can promote nematogen ordering, resulting in long-range nematic order. We obtain the transport properties of our model within an effective resistor network picture. We discuss these ideas in the context of the 2D electron gas at the (111) KTaO$_3$ interface and the doped topological insulators Nb$_x$Bi$_2$Se$_3$ and Cu$_x$Bi$_2$Se$_3$. Our work makes contact with Phil Anderson's numerous contributions to broken symmetries driven by the saving of kinetic energy, including double exchange ferromagnetism and the interlayer tunneling theory of high $T_c$ superconductivity.