I was reading about concept of effective mass on Wikipedia and came across the line that effective mass of a particle can be negative and even zero. How is this possible?
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$\begingroup$ Related: physics.stackexchange.com/q/104572 $\endgroup$– user31782Apr 30, 2014 at 6:41
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$\begingroup$ It can also be anisotropic (for example in Silicon) $\endgroup$– Phil HJul 1, 2014 at 15:04
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