Topological Insulators

Topological insulator materials are a recently discovered electronic phase with unique properties: such as spin-polarized protected surface/edge states akin to gapless Dirac states in Graphene and bulk magneto-electric effects, amongst others. TI materials have promising applications in spin based memory & logic and magnetoelectric switches. Our research on TI materials focuses on exploring the nature of charge and spin transport in TI devices and high quality material synthesis. Current topics include:

• Growth of high-quality thin films of TI materials in MBE and vdWE
• Magnetoransport experiments in TI devices
• TI based magnetoelectronics and spin-based switching devices
• Charge & spin transport physics and electronic structure

Recent Publications:

• Rik Dey, Nitin Prasad, Leonard F Register, and Sanjay K Banerjee. Conversion of spin current into charge current in a topological insulator: Role of the interface. Physical Review B, 97(17):174406, May 2018. [ bib | DOI | http ]
• Rik Dey, Leonard F Register, and Sanjay K Banerjee. Modeling all-electrical detection of the inverse edelstein effect by spin-polarized tunneling in a topological-insulator/ferromagnetic-metal heterostructure. Physical Review B, 97(14):144417, April 2018. [ bib | DOI | http ]
• Rik Dey, Anupam Roy, Tanmoy Pramanik, Amritesh Rai, Seung Heon Shin, Sarmita Majumder, Leonard F. Register, and Sanjay K. Banerjee. Detection of current induced spin polarization in epitaxial Bi₂Te₃ thin film. Applied Physics Letters, 110(12):122403, March 2017. [DOI | http ]
• Rik Dey, Anupam Roy, Tanmoy Pramanik, Samaresh Guchhait, Sushant Sonde, Amritesh Rai, Leonard F. Register, and Sanjay K. Banerjee. Localization and interaction effects of epitaxial Bi2Se3 bulk states in two-dimensional limit. Journal of Applied Physics, 120(16):164301, October 2016. [DOI | http ]
• S. Majumder, S. Guchhait, R. Dey, L. F. Register, and S. K. Banerjee. Large Magnetoresistance at Room Temperature in Ferromagnet - Topological Insulator Contacts. IEEE Transactions on Nanotechnology, 15(4):671-674, July 2016. [DOI ]
• Tanuj Trivedi, Sushant Sonde, Hema C. P. Movva, and Sanjay K. Banerjee. Weak antilocalization and universal conductance fluctuations in bismuth telluro-sulfide topological insulators. Journal of Applied Physics, 119(5):055706, February 2016. [ DOI | http ]
• Urmimala Roy, Rik Dey, Tanmoy Pramanik, Bahniman Ghosh, Leonard F. Register, and Sanjay K. Banerjee. Magnetization switching of a metallic nanomagnet via current-induced surface spin-polarization of an underlying topological insulator. Journal of Applied Physics, 117(16):163906, April 2015. [ DOI | http ]
• Rik Dey, Tanmoy Pramanik, Anupam Roy, Amritesh Rai, Samaresh Guchhait, Sushant Sonde, Hema C. P. Movva, Luigi Colombo, Leonard F. Register, and Sanjay K. Banerjee. Strong spin-orbit coupling and Zeeman spin splitting in angle dependent magnetoresistance of Bi2Te3. Applied Physics Letters, 104(22):223111, June 2014. [ DOI | http ]
• Priyamvada Jadaun, Di Xiao, Qian Niu, and Sanjay K. Banerjee. Topological classification of crystalline insulators with space group symmetry. Phys. Rev. B, 88(8):085110, August 2013. [ DOI | http ]
• Anupam Roy, Samaresh Guchhait, Sushant Sonde, Rik Dey, Tanmoy Pramanik, Amritesh Rai, Hema C. P. Movva, Luigi Colombo, and Sanjay K. Banerjee. Two-dimensional weak anti-localization in Bi2Te3 thin film grown on Si(111)-(7 × 7) surface by molecular beam epitaxy. Applied Physics Letters, 102(16):163118, April 2013. [ DOI | http ]
• Jiwon Chang, Leonard F. Register, and Sanjay K. Banerjee. Topological insulator Bi2Se3 thin films as an alternative channel material in metal-oxide-semiconductor field-effect transistors. Journal of Applied Physics, 112(12):124511, December 2012. [ DOI | http ]
• Jiwon Chang, L.F. Register, and S.K. Banerjee. Possible applications of topological insulator thin films for tunnel FETs. In Device Research Conference (DRC), 2012 70th Annual, pages 31-32, June 2012. [ DOI ]
• Jiwon Chang, Priyamvada Jadaun, Leonard F. Register, Sanjay K. Banerjee, and Bhagawan Sahu. Dielectric capping effects on binary and ternary topological insulator surface states. Phys. Rev. B, 84(15):155105, October 2011. [ DOI | http ]
• Jiwon Chang, Leonard F. Register, Sanjay K. Banerjee, and Bhagawan Sahu. Density functional study of ternary topological insulator thin films. Phys. Rev. B, 83(23):235108, June 2011. [ DOI | http ]