Non-Bloch PT symmetry breaking in two-dimensional non-Hermitian bands

Recent studies of non-Hermitian topology have uncovered unique phenomena such as the non-Hermitian skin effect. From a topological perspective, the non-Bloch band theory has been introduced to predict non-Hermitian topological edge states. Nevertheless, it is unclear to what extent the non-Bloch bands may manifest themselves in the bulk physics. Here, we show that non-Hermitian skin effect and non-Bloch bands cause a thresholdless PT symmetry breaking in two-dimensional non-Hermitian systems. Our work highlights an intriguing interplay among non-Bloch band, PT symmetry, and spatial dimensions.