Time-reversal symmetry breaking surface states in t-J model

Abstract

Recently a phenomenological Ginzburg-Landau (GL) theory has been proposed to describe the occurrence of a locally time-reversal symmetry (T) breaking state near a Josephson junction between unconventional superconductors. In this paper we derive this type of GL free energy microscopically from the t-J model within a slave-boson mean-field approximation. The resulting GL free energy is shown to satisfy the conditions to have a T-violating surface state. The existence of this junction state may explain some of the recent experiments on High-Tc superconductors.

6 pages, 9 figures

References in corpus (2)

• Tunneling into Current-Carrying Surface States of High T${}_c$ Superconductors
• Time Reversal Symmetry Breaking and Spontaneous Currents in s-Wave / Normal Metal / d-Wave Superconductor Sandwiches

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• Clapping modes in unconventional superconductors
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• Gap structure and phase diagram of twisted bilayer cuprates from a microscopic perspective
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