The field of information retrieval is moving towards a more nuanced understanding of complex, multi-faceted concepts, with a focus on entity-aware and semantic matching approaches. Recent developments have highlighted the importance of modeling relationships between entities and concepts, and of incorporating structural information from knowledge graphs to enhance retrieval performance. Noteworthy papers in this area include: PairSem, which proposes a framework for pairwise semantic matching that captures complex scientific concepts. REGENT, which introduces a neural re-ranking model that uses entities as a semantic skeleton to guide attention. QDER, which unifies entity-oriented and multi-vector approaches to neural IR by integrating knowledge graph semantics into a multi-vector model.