Discovery of segmented Fermi surface induced by Cooper pair momentum

Abstract

Since the early days of Bardeen-Cooper-Schrieffer theory, it has been predicted that a sufficiently large supercurrent can close the energy gap in a superconductor and creates gapless Bogoliubov quasiparticles through the Doppler shift of quasiparticle energy due to the Cooper pair momentum. In this gapless superconducting state, zero-energy quasiparticles reside on a segment of the normal state Fermi surface, while its remaining part is still gapped. The finite density of states of field-induced quasiparticles, known as the Volovik effect, has been observed in tunneling and specific heat measurements on d- and s-wave superconductors. However, the segmented Fermi surface of a finite-momentum state carrying a supercurrent has never been detected directly. Here we use quasiparticle interference (QPI) technique to image field-controlled Fermi surface of Bi${}_2$Te${}_3$ thin films proximitized by the superconductor NbSe${}_2$. By applying a small in-plane magnetic field, a screening supercurrent is induced which leads to finite-momentum pairing on topological surface states of Bi${}_2$Te${}_3$. Our measurements and analysis reveal the strong impact of finite Cooper pair momentum on the quasiparticle spectrum, and thus pave the way for STM study of pair density wave and FFLO states in unconventional superconductors.

arXiv comment25 pages, 14 figures

References in corpus (29)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Kwant: a software package for quantum transport
• Hexagonal Warping Effects in the Surface States of Topological Insulator Bi${}_2$Te${}_3$
• Experimental demonstration of the topological surface states protected by the time-reversal symmetry
• Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
• Quasiparticle Scattering Interference in High Temperature Superconductors
• Topological Superconductor Bi2Te3/NbSe2 heterostructures
• Magneto-infrared spectroscopy of Landau levels and Zeeman splitting of three-dimensional massless Dirac Fermions in ZrTe${}_5$
• Observation of a Majorana zero mode in a topologically protected edge channel
• Density of states in a superconductor carrying a supercurrent
• Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe${}_2$
• Bogoliubov Fermi surfaces: General theory, magnetic order, and topology
• Visualizing the Energy-gap Modulations of the Cuprate Pair Density Wave State
• Quasiparticle Interference on the Surface of the Topological Insulator Bi${}_2$Te${}_3$
• Discovery of segmented Fermi surface induced by Cooper pair momentum
• Zeeman-Induced Gapless Superconductivity with Partial Fermi Surface
• Volovik effect in the $\pm$s-wave state for the iron-based superconductors
• Finite momentum Cooper pairing in 3D topological insulator Josephson junctions
• Topological metals and finite-momentum superconductors
• Observation of Zeeman effect in topological surface state with distinct material dependence
• Atomic-scale Electronic Structure of the Cuprate Pair Density Wave State Coexisting with Superconductivity
• Phase Coherence and Andreev Reflection in Topological Insulator Devices
• Novel self-epitaxy for inducing superconductivity in the topological insulator (Bi1-xSbx)2Te3
• Volovik effect in a highly anisotropic multiband superconductor: experiment and theory
• Creating Majorana modes from segmented Fermi surface
• Revisiting Quasiparticle Scattering Interference in High-Temperature Superconductors: The Problem of Narrow Peaks
• Superconducting quantum spin-Hall systems with giant orbital g-factors

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• Large Exchange Bias Effect and Coverage-Dependent Interfacial Coupling in CrI3/MnBi2Te4 van der Waals Heterostructures
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• Supercurrent-induced topological phase transitions
• Supercurrent induced resonant optical response
• Inhomogeneous superconducting states in two weakly linked superconducting ultra thin films
• Proximity-Induced Superconductivity in Atomically Precise Nanographene
• Quantum phase transition in magnetic nanographenes on a lead superconductor
• Deconfinement of Majorana vortex modes produces a superconducting Landau level
• Temperature tuned Fermi surface topology and segmentation in non-centrosymmetric superconductors
• Thermal Responses of Spin Density and Spin Current Induced by Bogoliubov Fermi Surfaces in Proximity Superconductors