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Kutnyakhov, D.; Chernov, S.; Medjanik, K.; Wallauer, R.; Tusche, C.; Ellguth, M.; Nepijko, S. A.; Krivenkov, M.; Braun, J.; Borek, S.; Minár, J.; Ebert, H.; Elmers, H. J.; Schönhense, G. (2016): Spin texture of time-reversal symmetry invariant surface states on W(110). In: Scientific Reports, Vol. 6, 29394
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Abstract

We find in the case of W(110) previously overlooked anomalous surface states having their spin locked at right angle to their momentum using spin-resolved momentum microscopy. In addition to the well known Dirac-like surface state with Rashba spin texture near the Gamma-point, we observe a tilted Dirac cone with circularly shaped cross section and a Dirac crossing at 0.28 x Gamma(N) over bar within the projected bulk band gap of tungsten. This state has eye-catching similarities to the spin-locked surface state of a topological insulator. The experiments are fortified by a one-step photoemission calculation in its density-matrix formulation.