Extended Data Fig. 1: The comparison of electron scattering on the Sb-terminated and full Cs-terminated surface of CsV3Sb4.98Sn0.02. | Nature Physics

Extended Data Fig. 1: The comparison of electron scattering on the Sb-terminated and full Cs-terminated surface of CsV3Sb4.98Sn0.02.

From: Unidirectional coherent quasiparticles in the high-temperature rotational symmetry broken phase of AV3Sb5 kagome superconductors

Extended Data Fig. 1

(a) STM topograph of the full Cs termination. (b) STM topograph of the Sb-terminated surface. (c,d) dI/dV(r, V) maps taken over regions in (a, b), respectively, and (e,f) associated Fourier transforms (FTs) of (c, d). Both C2-symmetric scattering arising from portions of the V bands (q2) and the scattering from Sb pocket near Γ (q1) are apparent on the Sb surface in (f); however only q1 related to the Sb pocket is seen on the full Cs surface in (e). This suggests that Vanadium kagome bands are difficult to detect on the Cs termination. (g, h) FTs of dI/dV(r, V) maps taken on (g) Cs and (h) Sb surface with bias settings V of: 2 mV, 0 mV, −2 mV and −5 mV. No C2-symmetric scattering can be seen at these other energies near Fermi level on the Cs surface, thus further signaling the difficulty of detecting the V bands on Cs termination. STM setup conditions: (a, c, e, g): Vsample = 30 mV, Vexc = 1 mV, Iset = 300 pA; (b, d, f, h): Vsample = 20 mV, Vexc = 1 mV, Iset = 400 pA.

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