Observation of Magnetoplasmons in Bi2Se3 Topological Insulator

Both the collective (plasmon) and the single particle (Drude) excitations of an electron gas can be controlled and modified by an external magnetic field B. At finite B, plasmon gives rise to a magnetoplasmon mode and the Drude term to a cyclotron resonance. These magnetic effects are expected to be extremely strong for Dirac electrons with a linear energy-momentum dispersion, like those present in graphene and topological insulators (TIs). Here, we investigate both the plasmon and the Drude response versus B in Bi2Se3 topological insulator. At low B, the cyclotron resonance is still well separated in energy from the magnetoplasmon mode; meanwhile, both excitations asymptotically converge at the same energy for increasing B, consistently with a dynamical mass for Dirac carriers of mD* = 0.18 ± 0.01 me. In TIs, one then achieves an excellent magnetic control of plasmonic excitations and this could open the way toward plasmon controlled terahertz magneto-optics.

[1]  R. Cava,et al.  Optical Conductivity of Bismuth-Based Topological Insulators , 2012, 1201.5609.

[2]  John Preskill,et al.  Topological entanglement entropy. , 2005, Physical Review Letters.

[3]  I Gaponenko,et al.  Intrinsic terahertz plasmons and magnetoplasmons in large scale monolayer graphene. , 2012, Nano letters.

[4]  A. Belyanin,et al.  Strong magneto-optical effects due to surface states in three-dimensional topological insulators. , 2014, Optics express.

[5]  S. Maier,et al.  Fano resonances in nanoscale plasmonic systems: a parameter-free modeling approach. , 2011, Nano letters.

[6]  Z. K. Liu,et al.  Experimental Realization of a Three-Dimensional Topological Insulator , 2010 .

[7]  R. Hatch,et al.  Large tunable Rashba spin splitting of a two-dimensional electron gas in Bi2Se3. , 2011, Physical review letters.

[8]  A. Markelz,et al.  Terahertz response and colossal Kerr rotation from the surface states of the topological insulator Bi2Se3. , 2011, Physical review letters.

[9]  Y. S. Kim,et al.  Thickness-independent transport channels in topological insulator Bi(2)Se(3) thin films. , 2011, Physical review letters.

[10]  A. Geim,et al.  Two-dimensional gas of massless Dirac fermions in graphene , 2005, Nature.

[11]  C. Kane,et al.  Topological Insulators , 2019, Electromagnetic Anisotropy and Bianisotropy.

[12]  Jing Wang,et al.  Topological insulators for high-performance terahertz to infrared applications , 2010, 1101.3583.

[13]  G. Armelles,et al.  Magnetoplasmonics: Combining Magnetic and Plasmonic Functionalities , 2013 .

[14]  P. Calvani,et al.  Observation of Dirac plasmons in a topological insulator. , 2013, Nature nanotechnology.

[15]  Nikolay I. Zheludev,et al.  Ultrafast active plasmonics: transmission and control of femtosecond plasmon signals , 2008 .

[16]  G. Collins.  Computing with quantum knots. , 2006, Scientific American.

[17]  H. Bechtel,et al.  Graphene plasmonics for tunable terahertz metamaterials. , 2011, Nature nanotechnology.

[18]  F. J. García de abajo,et al.  Plasmon–Phonon Interactions in Topological Insulator Microrings , 2015 .

[19]  Eva Andrei,et al.  Epitaxial growth of topological insulator Bi2Se3 film on Si(111) with atomically sharp interface , 2011 .

[20]  L. Brey,et al.  Spin-charge separation of plasmonic excitations in thin topological insulators , 2013, 1308.5904.

[21]  E. J. Mele,et al.  Quantum spin Hall effect in graphene. , 2004, Physical review letters.

[22]  R. Zaccaria,et al.  Interplay between electric and magnetic effect in adiabatic polaritonic systems. , 2013, Optics express.

[23]  C. Morris,et al.  A sudden collapse in the transport lifetime across the topological phase transition in (Bi1−xInx)2Se3 , 2012, Nature Physics.

[24]  Joel E Moore,et al.  The birth of topological insulators , 2010, Nature.