  The structural, magnetotransport, and angle-resolved photoemission
spectroscopy (ARPES) of Ag-doped Bi2Se3 single crystals are presented.
Temperature dependent resistivity exhibits metallic behavior with a slope
change above 200 K for Ag-doped Bi2Se3. The magnetoresistance shows positive
quadratic dependence at low fields satisfying Kohler's rule. Hall resistivity
measurement shows that electrons are dominant charge carriers. Furthermore,
these results agree well with the ARPES spectra observed at T = 20 K, where the
Fermi level lies inside the bulk conduction band. The Dirac point of the
topological surface states is shifted toward higher binding energy (~ 0.12 eV)
for Ag-doped samples as compared to pristine Bi2Se3.
