Abstract: A state of matter with a multi-component order parameter can give rise to vestigial order. In the vestigial phase, the primary order is only partially melted, leaving a remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due to primary spin and charge-density-wave order have been discussed in the context of iron-based and cuprate materials. Here we discuss a partially melted superconductor in which pairing fluctuations condense at a separate phase transition and form a nematic state with broken Z_3, i.e. three-state Potts-model symmetry. This state was recently confirmed in measurements of the doped topological insulator Nb_xBi_2Se_3 and Cu_xBi_2Se_3.
Add to Calendar
2021-01-28T10:00:002021-01-28T11:00:00CM Seminar - Z3-vestigial nematic order due to superconducting fluctuations in the doped topological insulatorEvent Information:
https://ubc.zoom.us/j/64183011430?pwd=U2lFNXEwSmlBRWVBdTR5OG1ZdlVSZz09
Meeting ID: 641 8301 1430
Passcode: 113399
Abstract: A state of matter with a multi-component order parameter can give rise to vestigial order. In the vestigial phase, the primary order is only partially melted, leaving a remaining symmetry breaking behind, an effect driven by strong classical or quantum fluctuations. Vestigial states due to primary spin and charge-density-wave order have been discussed in the context of iron-based and cuprate materials. Here we discuss a partially melted superconductor in which pairing fluctuations condense at a separate phase transition and form a nematic state with broken Z_3, i.e. three-state Potts-model symmetry. This state was recently confirmed in measurements of the doped topological insulator Nb_xBi_2Se_3 and Cu_xBi_2Se_3.Event Location:
Zoom link in description