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Using a discrete-lattice approach, we calculate the conductance spectrabetween a normal metal and an s-wave Larkin-Ovchinnikov (LO) superconductor,with the junction interface oriented {\em along} the direction of theorder-parameter (OP) modulation. The OP sign reversal across one single nodalline can induce a sizable number of zero-energy Andreev bound states around thenodal line, and a hybridized midgap-states band is formed amid amomentum-dependent gap as a result of the periodic array of nodal lines in theLO state. This band-in-gap structure and its anisotropic properties give riseto distinctive features in both the point-contact and tunneling spectra ascompared with the BCS and Fulde-Ferrell cases. These spectroscopic features canserve as distinguishing signatures of the LO state.

Spectroscopic signatures of the Larkin-Ovchinnikov state in the conductance characteristics of a normal-metal/superconductor junction