TOKYO: Japanese tech stocks fell on Tuesday (Jan 28) following a plunge in US tech stocks driven by the emergence of a low-cost Chinese generative AI model . US chipmaker Nvidia led a rout on Wall Street, falling nearly 17 per cent on fears that Chinese firm DeepSeek's chatbot could threaten US dominance in artificial intelligence. Nvidia stock was up slightly in after-hours trading. Heavyweight chip-related stocks tracked an overnight drop in the Nasdaq, but gains in bank shares helped the