Where does well collide?

In semiconductor physics a well is a region of low potential energy that confines charge carriers, most sharply realised in the quantum well: a thin layer of a narrow-gap material sandwiched between wider-gap barriers, so thin that electrons and holes occupy discrete, quantised energy levels in the confinement direction. Dingle, Wiegmann, and Henry's 1974 Quantum states of confined carriers in very thin AlGaAs-GaAs-AlGaAs heterostructures resolved those bound states optically and is the foundational demonstration of the effect. The referent is a confining energy minimum in a solid, characterised by its depth, width, and the ladder of allowed levels inside it, and it has nothing to do with a bored hole for water or a word people say while hesitating.[1]

Unit

The depth and width of the confining energy minimum, and its bound-state energies

Recovery means

Not applicable

Measured by

Probed by optical absorption and photoluminescence that reveal the discrete confined-level transitions, and by the layer thickness that sets them

In pragmatics, well is a discourse marker: a short utterance-initial particle that carries little truth-conditional content but signals how the speaker is framing what follows: flagging a dispreferred answer, a shift of frame, a repair, or a loosened fit to the prior question. Jucker's 1993 The discourse marker well: A relevance-theoretical account analyses it as an instruction guiding the hearer toward the intended interpretation rather than as a word denoting anything. The referent is a conversational signalling device defined by its function in interaction, measured through corpus and conversation-analytic study of where and why speakers deploy it, unrelated to an energy well or a water well beyond the shared spelling.[2]

Unit

The interactional functions the particle signals in context

Recovery means

Not applicable

Measured by

Studied through corpus frequency and conversation-analytic coding of its positions and functions in talk