DSpace Collection: http://dspace.cus.ac.in/jspui/handle/1/6381 2026-04-10T01:40:49Z Gapped fermionic spectrum from a domain wall in seven dimension http://dspace.cus.ac.in/jspui/handle/1/6389 Title: Gapped fermionic spectrum from a domain wall in seven dimension Authors: Mukhopadhyay, Subir; Rai, Nishal Abstract: We obtain a domain wall solution in maximally gauged seven dimensional supergravity, which interpolates between two AdS spaces and spontaneously breaks a symmetry. We analyse frequency dependence of conductivity and find power law behaviour at low frequency. We consider certain fermions of supergravity in the background of this domain wall and compute holographic spectral function of the operators in the dual six dimensional theory. We find fermionic operators involving bosons with non-zero expectation value lead to gapped spectrum. 2018-01-01T00:00:00Z Holographic Fermi surface at finite temperature in six-dimensional (2, 0) theory http://dspace.cus.ac.in/jspui/handle/1/6388 Title: Holographic Fermi surface at finite temperature in six-dimensional (2, 0) theory Authors: Mukhopadhyay, Subir; Rai, Nishal Abstract: We analyzed two-point Green’s functions of operators in six-dimensional (2, 0) theory dual to fermions in maximal gauged supergravity in seven dimensions at finite temperature. We have considered backgrounds with both the charge parameters nonzero as well as only one charge parameter nonzero. In the former case we find all the modes admit Fermi surface(s), while in the latter, some of the modes do not have a Fermi surface. We find backgrounds corresponding to nonzero expectation value of the scalar appearing in the dual operator give rise to Fermi surface(s). 2017-01-01T00:00:00Z Holographic Fermi surfaces in the six-dimensional (2, 0) theory http://dspace.cus.ac.in/jspui/handle/1/6387 Title: Holographic Fermi surfaces in the six-dimensional (2, 0) theory Authors: Mukhopadhyay, Subir; Rai, Nishal Abstract: We analyze the Fermi surface behavior of fermionic modes from a charged black hole background with two different charges arising in a truncated gauged supergravity theory in seven dimensions, which is dual to the six-dimensional (2, 0) theory. At zero temperature, we numerically solve equations for fermionic modes that do not couple to the gravitino. We find that each of the modes admits at least one Fermi surface. We find Fermi surfaces in both the Fermi-liquid and non-Fermi-liquid regimes. 2017-01-01T00:00:00Z