 

Bsh  Bsh0 mˆ  zˆ  ˆje mˆ

zˆ

ˆje



/ 2 e    sh J c t f M s 

Bsh0

2

 sh  J s J c

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

Downloaded from www.sciencemag.org on June 11, 2015

Research Articles

Fshy

μ

B  0.5

μ

μ

μ

μ

B  0.5

μ

B  0.46

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 Δt  μ

μ

B  100

S 1

m   m   y m  dxdy 4   x

B  0.5

v   

t 

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B  10

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Fshy

/ sciencemag.org/content/early/recent / 11 June 2015 / Page 6 / 10.1126/science.aaa1442

B  0.5

/ sciencemag.org/content/early/recent / 11 June 2015 / Page 7 / 10.1126/science.aaa1442

B  0.46

/ sciencemag.org/content/early/recent / 11 June 2015 / Page 8 / 10.1126/science.aaa1442

B  100

B  10

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