It seems to me that Applied Linguistics is a VERY broad field that has changed a lot over the years. Therefore, it is a very difficult task to choose just one paper not written by Dr. Stephen Louw to represent the entire field. I couldn't think of a paper off the top of my head, so I just put in a bunch of random AL keywords into Google Scholar. Luckily, I felt that one of the top results was a decent "exemplar" for an AL paper. It was:
Anton, M. (1999). The discourse of a Learner‐Centered classroom: Sociocultural perspectives on Teacher‐Learner interaction in the Second‐Language classroom. The Modern Language Journal, 83(3), 303-318.
You can probably guess what keywords I used just by looking at the title of the paper. Here is the abstract:
This study investigates learner-centered and teacher-centered discourse in interactive exchanges between teachers and learners in the second language (L2) classroom. The analysis of interaction shows that learner-centered discourse provides opportunities for negotiation (of form, content, and classroom rules of behavior), which creates an environment favorable to L2 learning. In contrast, teacher-centered discourse is shown to provide rare opportunities for negotiation. Placing the analysis within the context of the role of discourse in the mediation of cognitive development, a central point in sociocultural theory, this study demonstrates that when learners are engaged in negotiation, language is used to serve the functions of scaffolding (Wood, Bruner, & Ross, 1976) and to provide effective assistance as learners progress in the zone of proximal development (Vygotsky, 1978). The analysis presented here attempts to show how various communicative moves and linguistic forms are deployed to achieve these functions.
There are a lot of AL terms/theories in this short abstract: classroom discourse, L2 learners, cognitive development, sociocultural theory, scaffolding, Vygotsky's ZPD, communicative moves, linguistic forms, and communicative functions. Other ideas/theories in the article include feedback, learning preferences and strategies, and feedback. This 20 year old article touches on a lot of ideas that build the foundation of a lot of research since then, so I feel that it would be appropriate to share with novice researchers as an introduction to Applied Linguistics.