95 B.A. Bernevig and S.C. Zhang,...
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Transcript of 95 B.A. Bernevig and S.C. Zhang,...
C.L. Kane and E.J. Mele, PRL 95, 226801 (2005)
B.A. Bernevig and S.C. Zhang, PRL 96, 106802 (2006)
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
A. Roth et al., Science 325, 294 (2009); J. Maciejko et al., PRL 102, 256803 (2009)
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
M. Topinka et al., Nature 410, 183 (2001); M. Jura et al., Nat. Phys 3, 841 (2007)
z (nm)400
0
2 μm
2 μm
Vtip = -8 V
G(e2/h)+0.1
-0.1
G (
e2/h
)
y (μm)
-8 V -4 V +4 V-2 V +2 V0 V-6 V
-0.1 +0.1
G (e2/h)
mesa
-8 V +4 V
mesa
50 μm
-8 V +4 V-10 V +5 V
mesa
50 μm
-8 V +4 V-10 V +5 VG(-10 V)
– G(+5 V)
