Why is the old man in Breaking Bad called Heisenberg?

In the sixth episode of the first season, the reason why Lao Bai was called Heisenberg was because he made it up randomly in order to prevent the other party from knowing his real name when he first traded with Tuco. As a chemistry teacher, Lao Bai paid more attention to science, so he casually named himself Heisenberg.

Werner Heisenberg (December 5, 1901 - February 1, 1976) was a German physicist and one of the founders of quantum mechanics.

Extended information:

Plot summary

The story takes place in New Mexico. Walter White, a high school chemistry teacher, is an extremely ordinary little man.

Waterburn was a top student in chemistry at a university graduate school and participated in the collaboration for the Nobel Prize in Chemistry. However, he gave up becoming a chemist in order to live an ordinary life and worked as a chemistry teacher in a high school. But he was diagnosed with moderate to advanced lung cancer.

Facing the sudden misfortune, his first thought was the future livelihood of his family, because he has a pregnant wife in her 40s and a son with mild cerebral palsy. And he is the family's sole breadwinner.

Baidu Encyclopedia-Breaking Bad