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40 60 80 100 120 140-100
-50
0
50
100
Eg
ap / e
V E1
H4
H3
H1
dQW
/ Å
E2
H2
HgTe QW
B.A. Bernevig, T. L. Hughes, and S. C. Zhang, Science 314, 1757 (2006)
M. König et al., Science 318, 766 (2007); M. König et al., JPSJ 77, 031007 (2008);
A. Roth et al., Science 325, 294 (2009)
-2.0 -1.5 -1.0 -0.5 0.010
2
103
104
105
106
G = 2 e2/h
Rxx /
Vg / V
45 Å
80 Å
M. Topinka et al., Nature 410, 183 (2001); M. Jura et al., Nat. Phys 3, 841 (2007)
coarse
positioning
(several mm)
piezo-electric
scanner
(several μm)
AFM tip
Sample